Frank solutions for Chemistry Part 2 [English] Class 10 ICSE chapter 10 - Practical Work [Latest edition]

How will you identify?
Chloride ion

How will you identify?
Chlorine gas

How will you identify?
Sulphur dioxide gas

How will you identify?
A Soluble carbonate

How will you identify?
An amphoteric hydroxide

Name the following:
A green coloured carbonate.

Name the following:
A steel grey coloured solid non-metal.

Name the following:
A nitrate which has no water of crystallization.

Name the following:
A sulphate insoluble in water.

Give two tests of the following:
NH₃

Give two tests of the following:
Oxygen

Give two tests of the following:
Water vapour

Write the steps needed for flame test ?

What happens when
NH₃ solution is added to CuSO₄ solution drop by drop and then in excess.

What happens when
Caustic soda solution is added to Cu(NO₃)₂ solution and product boiled.

What happens when
Common salt solution is added to silver nitrate solution and NH₃ solution add to it.

What happens when
Lead nitrate solution treated with calcium chloride solution and products are heated and cooled.

Write sqauential observation for effect of heat on Copper nitrate.

Write sqauential observation for effect of heat on Lead carbonate.

Write sqauential observation for effect of heat on Ammonium chloride.

How will you distinguish between the two black samples, CuO and MnO₂ with a chemical test?

A white solid A when heated with sodium hydroxide solution, gives a pungent gas B, which turns red litmus blue. The solid, when dissolved in dilute nitric acid and treated with silver nitrate gives a white precipitate of C which is soluble in an ammonia solution.

Write the approximate colour of the following sample with the universal indicator:
Distilled water

Write the approximate colour of the following sample with the universal indicator: Acid rain

Write the approximate colour of the following sample with the universal indicator: Soap Solution

Write the approximate colour of the following sample with the universal indicator: Soil containing slaked lime

Write the approximate colour of the following sample with the universal indicator: Gastric juice

Using Sodium hydroxide solution, how would you distinguish: Ammonium sulphate from sodium sulphate.

Using Sodium hydroxide solution, how would you distinguish: Zinc nitrate solution from calcium nitrate solution.

Using Sodium hydroxide solution, how would you distinguish: Iron(II) chloride from Iron (III) chloride

One chemical test that would enable you to distinguish between the following pair of chemicals. Describe what happens with each chemical or state 'no visible reaction'.
Sodium chloride solution and sodium nitrate solution.

One chemical test that would enable you to distinguish between the following pair of chemicals. Describe what happens with each chemical or state 'no visible reaction'.
Sodium sulphate solution and sodium chloride solution.

One chemical test that would enable you to distinguish between the following pair of chemicals. Describe what happens with each chemical or state 'no visible reaction'.
Calcium nitrate solution and zinc nitrate solution.

State the effect of adding a small amount of : (a) sodium hydroxide (b) ammonium hydroxide followed by an excess in case to samples of the salt solutions.
Calcium nitrate [ small amount __________ in excess __________ ]

State the effect of adding a small amount of : (a) sodium hydroxide (b) ammonium hydroxide followed by an excess in case to samples of the salt solutions.
Zinc nitrate [ small amount ________ in excess ________]

State the effect of adding a small amount of : (a) sodium hydroxide (b) ammonium hydroxide followed by an excess in case to samples of the salt solutions.
Lead nitrate [ small amount ________ in excess ________ ]

State what do you observe when ammonium hydroxide to Iron (III) sulphate solution.

From the formulae listed below, Choose, one, corresponding to the salt having the given description:
AgCl, CuCO₃, CuSO₄.5H₂O, KNO₃, NaCl, NaHSO₄, Pb(NO₃)₂, ZnCO₃, ZnSO₄, 7H₂O.
On heating this, salt changes from green to black.

How would you distinguish between Zn²⁺ and Pb²⁺ using ammonium hydroxide solution?

Copy and complete the following table which refers to the action of heat on some carbonates:

Write the observation for the following:
NaOH is added drop-wise till in excess to a solution of zinc sulphate.

Write the observation for the following :
NH₄OH is added first in a small quantity and then in excess to a solution of copper sulphate.

Write the observation for the following:
Excess NH₄OH is added to a substance obtained by adding hydrochloric acid in silver nitrate solution.

Write the observation for the following:
Moist starch iodide paper is put on the mouth of a test tube containing chlorine gas.

Write the observation for the following:
A paper dipped in potassium permanganate solution is put on the mouth of a test tube containing sulphur dioxide gas.

State your observation when:

Decomposition of bicarbonates by dil. H₂SO₄

2NaHCO₃ + H₂SO₄ → Na₂SO₄ + 2H₂O + 2CO₂

2KHCO₃ + H₂SO₄ → K₂SO₄ + 2H₂O + 2CO₂

Sodium hydroxide solution is added first in a small quantity, then in excess to the aqueous salt solutions of copper (II) sulphate, zinc nitrate, lead nitrate, calcium chloride, and iron (III) sulphate. Copy the following table and write the colour of the precipitate in (i) to (v) and the nature of the precipitate (soluble or insoluble) in (vi) to (x).

A solution of hydrogen chloride in water is prepared. The following substances are added to separate portions of the solution:

The questions (i) to (v) refer to the following salt solutions listed A to F:

1. Copper nitrate
2. Iron (II) sulphate
3. Iron (III) chloride
4. Lead nitrate
5. Magnesium sulphate
6. Zinc chloride

1. Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?
2. Which two solutions will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution ?
3. Which solution will give a white precipitate, when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
4. Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it ?
5. Which solution gives a white precipitate with excess ammonium hydroxide solution?

State the colour of the residue formed when nitrate of calcium is strongly heated.

Give one test to distinguish between the following pair of chemicals.

Zinc nitrate solution and calcium nitrate solution

Give one test to distinguish between the following pair of chemicals.
Sodium nitrate solution and sodium chloride solution.

Give one test to distinguish between the following pair of chemicals.
Iron (III) Chloride solution and copper chloride solution.

Match the following:

Salts A, B, C, D and E undergo reactions (i) to (v) respectively. Identify the anion present in these salts on the basis of these reactions. Tabulate your answers in the format given below:
(i) When silver nitrate solution is added to asolution of A, a white precipitate, insoluble in dilute nitric acid, is formed.
(ii) Addition of dilute hydrochloric acid to B produces a gas which turns lead acetate paper black.
(iii) When a freshly prepared solution of ferrous sulphate is added to a solution of C and concentrated sulphuric acid is gently poured from the side of the test, a brown ring is formed.
(iv) When dilute sulphuric acid is added to D, a gas is produced which turns acidified potassium dichromate solution from orange to green.
(v) Addition of dilute hydrochloric acid to E produces an effervescence. The gas produced turns limewater milky but does not affect acidified potassium dichromate solution.

Choose the correct answer:
The salt which in solution gives a pale precipitate with sodium hydroxide solution and a white precipitate with barium chloride solution is:

Select from the list given (a to e) one substances in each case which matches the description given in parts (i) to (v). (Note : Each substance is used only one in the answer)
(a) Nitroso Iron (II) Sulphate
(b) Iron (III) chloride
(c) Chromium sulphate
(d) Lead (II) chloride
(e) Sodium chloride
(i) A compound which is deliquescent
(ii) A compound which is insoluble in cold water, but soluble in hot water
(iii) The compound responsible for the brown ring during the brown ring test of nitrate iron
(iv) A compound whose aqueous solution is neutral in nature
(v) The compound which is responsible for the green colouration when sulphur dioxide is passed through acidified potassium dichromate solution

What would you observe in the following case:

Ammonium hydroxide is first added in a small quantity and then in excess to a solution of copper sulphate.

Sodium hydroxide solution is added to the solutions containing the ions mentioned in List X. List Y gives the details of the precipitate. Match the ions with their coloured precipitates.

State two observations when
Lead nitrate crystals are heated in a hard glass test tube.

State two observations when
A few crystals of KNO₃ are heated in a hard glass tube

Give a chemical test to distinguish between the following pair of compounds:

Sodium chloride solution and sodium nitrate solution.

Give a chemical test to distinguish between the following pair of compounds:

Hydrogen chloride gas and hydrogen sulphide gas

Give a chemical test to distinguish between the following pair of compounds:
Calcium nitrate gas and sulphur diaoxide gas

Give a chemical test to distinguish between the following pair of compounds:

Carbon dioxide gas and sulphur dioxide gas

Distinguish between the following pair of compounds using the test given with brackets:

Dilute sulphuric acid and dilute hydrochloric acid (using barium chloride solution)

State the inference drawn from the following observation :

On carrying out the flame test with a salt P a brick red flame was obtained. What is the cation in P?

State the inference drawn from the following observation:

A gas Q turns moist lead acetate paper silvery black. Identify the gas Q.

State the inference drawn from the following observation:

pH of liquid R is 10. What kind of substance is R?

State the inference drawn from the following observation:

Salt S is prepared by reacting dilute sulphuric acid with copper oxide Identify S.

State your observation of the following case:

When dilute hydrochloric acid is added to sodium carbonate crystals.

State your observation of the following case :
When excess sodium hydroxide is added to calcium nitrate solution

State your observation of the following case:

At the cathode when acidified aqueous copper sulphate solution is electrolyzed with copper electrodes.

State your observation of the following case:

When calcium hydroxide is heated with ammonium chloride crystals.

State your observation of the following case:

When moist starch iodide paper is introduced into chlorine gas.

The following table shows the tests a student performed on four different aqueous solutions which are X,Y,Z and W. Based on the observations provided, Identify the cation present

Identify the anion present of the following compound:
A salt M on treatment with concentrated sulphuric acid produces a gas which fumes in moist air and gives dense fumes with ammonia.

Identify the anion present of the following compound:
A salt D on treatment with dilute sulphuric acid produces a gas which turns lime water milky but has no effect on acidified potassium dichromate solution

Identify the anion present of the following compound:
When barium chloride solution is added to salt solution E a white precipitate insoluble in dilute hydrochloric acid is obtained

From the list of the following salts choose the salt that most appropriately fits the description given in the following :
[ AgCl, MgCl₂, NaHSO₄, PbCO₃, ZnCO₃, KNO₃, Ca(NO₃)₂ ]

(i) A deliquescent salt
(ii) An insoluble chloride
(iii) On heating this salt gives a yellow residue when hot and white when cold
(iv) On heating this salt, a brown coloured to prepare the following salts:

Give balanced chemical equation to prepare the following salt:
Lead sulphate from lead carbonate

Give balanced chemical equation to prepare the following salt:
Sodium sulphate using dilute sulphuric acid

Give balanced chemical equation to prepare the following salt :
Copper chloride using copper carbonate

Identify the cation of the following case:
NaOH solution when added to solution (A) gives a reddish brown precipitate

Identify the cation of the following case:
NH₄OH solution when added to solution (B) gives white ppt. which does not dissolve in excess.

Identify the cation of the following case:
NaOH solution when added to solution (C) gives white ppt. which insoluble in excess.

Identify the gas evolved and give the chemical test in the following case:

Dilute hydrochloric acid reacts with sodium sulphite.

Identify the gas evolved and give the chemical test in the following case:

Dilute hydrochloric acid reacts with iron (II) sulphide.

Identify the salts P and Q from the observation given below:
On performing the flame test salt P produces a lilac coloured flame and its solution gives a white precipitate with silver nitrate solution. Which is soluble in ammonium hydroxide solution.

Identify the salts P and Q from the observation given below:
When dilute HCl is added to a salt Q, a brisk effervescence is produced and the gas turns lime water milky. When NH₄OH soltion is added to the above mixture (after adding dilute HCl), it produces a white precipitate which is soluble in excess NH₄OH solution.

Write a balanced chemical equation for the reaction of zinc with potassium hydroxide solution.

State one relevant observation for the following.

Lead nitrate solution is treated with sodium hydroxide solution drop wise till it is in excess.

State your observations when barium chloride solution is mixed with sodium sulphate solution.

Give a chemical test to distinguish between the given pair of chemicals:

Lead nitrate solution and zinc nitrate solution.

Distinguish between the following pairs of compounds using the reagent given in the bracket.
Mangenese dioxide and copper (II) oxide. (using concentrated HCl) 

 Distinguish between the following pairs of compounds using the reagent given in the bracket.
Ferrous sulphate solution and ferric sulphate solution. (Using sodium hydroxide solution) 

Distinguish between the following pairs of compounds using the reagent given in the bracket.
Dilute hydrochloric acid and dilute sulphuric acid. (Using lead nitrate solution) 

 Copper sulphate solution reacts with sodium hydroxide solution to form a precipitate of copper hydroxide according to the equation :
2 NaOH +CuSO₄ Na₂SO Cu (OH)₂
What is the colour of the precipitate formed?

State your observations when zinc carbonate is heated strongly.

Match the gases in column I to the identification of the gases mentioned in column II. 

Differentiate between the following pair based on the information given in the bracket.

Cation and anions (formation from an atom)

Give one test to distinguish between the following pair of chemicals.

Zinc nitrate solution and calcium nitrate solution

Distinguish by a chemical test, ammonium sulphate and sodium sulphate.

Distinguish by a chemical test, magnesium chloride and magnesium nitrate solutions.

Identify the salt P from the following observation.

Salt P has a light bluish green colour. On heating, it produces a black-coloured residue. Salt P produces brisk effervescence with dil. HCl and the gas evolved turn lime water milky, but there is no action with acidified potassium dichromate solution.

Identify the salt Q from the following observation.

Salt Q is white in colour. On strong heating, it produces buff yellow residue and liberates reddish brown gas solution ofsalt Q produces a chalky white insoluble precipitate with excess of ammonium hydroxide.

Identify the salt R from the following observation.

Salt R is black in colour. On reacting with concentrated HCl, it liberates a pungent greenish yellow gas which turns moist starch iodide paper blue-black.

Identify the substance underlined in the following:

The electrode that increases in mass during the electrorefining of silver.

Identify the substance underlined in the following:

The acid that is a dehydrating as well as a drying agent.

Identify the substance underlined in the following:

The catalyst used to oxidise ammonia into nitric oxide.

The metallic hydroxide which forms a deep inky blue solution with excess ammonium hydroxide solution is ______.

The nitrate which on thermal decomposition leaves behind a residue which is yellow when hot and white when cold:

Identify the cation in the following case:

Ammonium hydroxide solution when added to Solution B gives a white precipitate which does not dissolve in excess of ammonium hydroxide solution.

Identify the cation in the following case:

Sodium hydroxide solution when added to Solution C gives a white precipitate which is insoluble in excess of sodium hydroxide solution.

Identify the cation in the following case:

Ammonium hydroxide solution when added to Solution B gives a white precipitate which does not dissolve in excess of ammonium hydroxide solution.

Identify the cation in the following case:

Sodium hydroxide solution when added to Solution C gives a white precipitate which is insoluble in excess of sodium hydroxide solution.

Study the following observation and name the anion present in the reaction:

When few drops of dilute sulphuric acid is added to salt ‘R’ and heated, a colourless gas is released which turns moist lead acetate paper silvery black.

Study the following observation and name the anion present in the reaction:

When few drops of barium nitrate solution is added to the salt solution 'Q', a white precipitate is formed which is insoluble in HCl.

Study the following observation and name the anion present in the reaction:

When a crystalline solid ‘P’ is warmed with concentrated H₂SO₄ and copper turnings a reddish brown gas is released.

Choose the answer from the list which fits in the description:

[CCl₄, PbO, NaCl, CuO, NH₄Cl]

1. A compound which undergoes thermal dissociation.
2. An amphoteric oxide.
3. A compound which is a non-electrolyte.

The metal that will not produce hydrogen gas when reacted with dilute acids.

The compound that will produce sulphur dioxide gas when reacted with dilute HCl.

The solution of this compound produces dirty green precipitate with NaOH.

Rotten egg smell is due to the liberation of ______.

The element with highest ionisation potential is ______.

The inert electrode used in the electrolysis of acidified water is ______.

The metal nitrate which on thermal decomposition forms a black residue is ______.

Identify only the anion present in the following compound:

The compound, on heating, produces a colourless, odourless gas which turns lime water milky and has no effect on acidified potassium dichromate solution.

Identify only the anion present in the following compound:

The solution of the compound which on treating with concentrated sulphuric acid and freshly prepared ferrous sulphate solution produces a brown ring.

Differentiate between the following pair based on the criteria given:

Sulphuric acid and Nitric acid (using barium chloride solution)

Identify the gas evolved in the following reaction:

Copper carbonate is heated.

Identify the gas evolved in the following reaction:

\[\ce{MnO2}\] reacts with concentrated \[\ce{HCl}\].

Rita was given an unknown salt for identification. She prepared a solution of the salt and divided it into two parts.

• To the first part of the salt solution, she added a few drops of ammonium hydroxide and obtained a reddish-brown precipitate.
• To the second part of the salt solution, she added a few drops of silver nitrate solution and obtained a white precipitate.

Name:

1. The cation present and
2. The anion present in the salt given for identification.