ICSE Class 10 - CISCE Question Bank Solutions for Chemistry

Select the ion in each case, that would get selectively discharged from the aqueous mixture of the ions given below:

`"SO"_4^(2-)` , `"NO"_3^-` and `"OH"^-`

Select the ion in each case, that would get selectively discharged from the aqueous mixture of the ions given below:

`"Pb"^(2+)` , `"Ag"^+` and `"Cu"^(2+)`

Higher the pH value of a solution, the more ____________ (acidic / alkaline) it is.

Choose the correct answer from the options given below :

The particles present in strong electrolytes are :

(A) Only molecules

(B) Mainly ions

(C) Ions and molecules

(D) Only atoms

Write equations for the reactions taking place at the two electrodes (mentioning clearly the name of the electrode) during the electrolysis of Acidified copper sulphate solution with copper electrodes

Write equations for the reactions taking place at the two electrodes (mentioning clearly the name of the electrode) during the electrolysis of Molten lead bromide with inert electrodes

Give reasons why Sodium Chloride will conduct electricity only in the fused or aqueous solution state.

Explain why it is preferable to use a number of graphite electrodes as the anode instead of a single electrode, during the above electrolysis.

Give appropriate scientific reasons for Electrolysis is of molten lead bromide is considered to be a redox reaction.

Write the equation taking place at the anode

Write a balanced chemical equation for the reaction of sodium hydroxide solution with iron (III) chloride solution

Give a reason for Alkali metals are good reducing agents.

Three solutions P, Q and R have pH value of 3.5, 5.2 and 12.2 respectively. Which one of these is a:

1) Weak acid?

2) Strong alkali?

Define catenation.

How do atoms attain noble gas configuration?

Define a chemical bond.

Mention the basic tendency of an atom which makes it to combine with other atoms.

Elements A, B and C have atomic number 17, 19 and 10 respectively.
(a) State which one is: (i) a non-metal (ii) a metal, (iii) chemically inert?
(b) write down the formula of the compound formed by two of the above elements.

Five atoms are labelled from A to E.

(a) Which one of these atoms:
(i) contains 7 protons,
(ii) has an electronic configuration 2, 7?
(b) Write down the formula of the compound formed between C and D.
(c) predict which are: (i) metals, (ii) non-metals?

Match the atomic number 4, 8, 14, 15 and 19 with each of the following:
(a) A solid non-metal of valelncy 3.
(b) A gas of valency 2.
(c) A metal of valency 1.
(d) A non-metal of valency 4