(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

Write the colour of the following salt : Aluminium salts.

Write the colour of the following salt : Ferrous salts.

Write the colour of the following salt : Ferric salts.

Write the colour of the following salt : Calcium salts.

A metal whose alloy finds use in the construction of aircrafts in the powdered form is added to sodium hydroxide solution. A colourless gas was evolved and after reaction was over, the solution was colourless.
(a) Name the powdered metal added to sodium hydroxide solution.
(b) Name the gas evolved.
(c) Name the salt present in the colorless solution.

On adding dilute ammonia solution to a colourless solution of a salt, a white gelatinous precipitate appears. This precipitate however dissolves on addition of excess of ammonia solution. Identify (Choose from Na, l, Zn, Pb, Fe)
(a) Which metal salt solution was used?
(b) What is the formula of white gelatinous precipitate obtained?

Fill in the blanks.
 Salts of ______ [normal / transition] elements are generally coloured.  From the ions K¹⁺, Cr³⁺, Fe²⁺, Ca²⁺, \[\ce{SO^2-_3}\], \[\ce{Mn^1-_4}\],\[\ce{NO^1_3}\] the ions generally coloured are ______.

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'.

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.

Write balanced equation for the following reaction:
Iron(II) chloride solution with sodium hydroxide solution.

Write balanced equation for the following reaction:
Chlorine and cold dilute sodium hydroxide solution.

Write balanced equation for the following reaction:
Zinc and sodium hydroxide solution

Write balanced equation for the following reaction:
Sulphur dioxide and sodium hydroxide solution 
(Give the equation for the formation of the normal salt)

State what do you observe when:
Lead nitrate and sodium chloride are mixed.

Write the observation, and balanced equation for the following reaction:
Moist starch iodide paper is placed at the mouth of a test tube containing chlorine gas.

Name the following :  
Acid present in the stomach of mammals.

Name the following:
Acid used to extract glue from bones.

Name the following:  A greenish yellow gas.

Calcium oxide and phosphorous pentoxide are very good drying agents but they are not used to dry HCI gas. Give reasons for each.