(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Chemistry

When hydrogen is passed over a black solid compound A, the products are a 'colorless liquid' and a 'reddish-brown metal B'.

Substance B is divided into two parts each placed in separate test tubes.

Dilute HCl is added to one part of substance B and dilute HNO₃ to the other.

1. Name the substances A and B.
2. Give two tests for the colourless liquid formed in the experiment.
3. What happens to substance A when it reacts with hydrogen? Give reasons for your answer.
4. Write an equation for the reaction between hydrogen and substance A.
5. Is there any reaction between substance B and dilute hydrochloric acid? Give reasons for your answer.

Give a reason for the following.

Hydrogen is collected by the downward displacement of water and not of air, even though it is lighter than air.

Select the odd one out and justify your answer.

Zn, Fe, Mg, and Na

Select the odd one out and justify your answer.

SO₂, H₂S, NH_3, and CO₃

Select the odd one out and justify your answer.

Fe, Zn, Cu and Mg

Select the odd one out and justify your answer.

Fe, Pb, Al and Zn 

Helium is preferred to hydrogen for filling balloons because it is:

Which metal gives hydrogen with all of the following: water, acids, alkalis?

Which of the following metals does not give hydrogen with acids?

Choose terms from the options given in brackets to complete this sentence.

Sodium ………………. reacts smoothly with cold water.

(metal, amalgam, in the molten state)

Correct the following statement:

Very dilute nitric acid reacts with iron to produce hydrogen.

Correct the following statement:

Conc. H₂SO₄ reacts with zinc to liberate hydrogen. 

What do you observe when dilute sulphuric acid is added to Zinc granules.

Define the term solute.

Define the term – solvent

Give a chemical test to distinguish between the following gases:

Hydrogen chloride and hydrogen sulphide

Using dilute sulphuric acid how would you differentiate between:

Copper and magnesium

How would you identify the gaseous products evolved.

Using dilute sulphuric acid how would you differentiate between:

Sodium sulphide and sodium carbonate.

How would you identify the gaseous products evolved.

Define the term solution.

State the characteristics of a true solution.