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

State your observations when Dilute Hydrochloric acid is added to Sodium thiosulphate.

The equation for the reaction when compound A is bubbled through bromine dissolved in carbon tetrachloride is as follows:

1) Draw the structure of A.

2) State your observation during this reaction.

A gaseous hydrocarbon contains 82.76% of carbon. Given that its vapor density is 29, find its molecular formula. [C = 12, H = 11]

Name the gas evolved when the following mixtures are heated.

Sodium Nitrite and Ammonium Chloride

State what would you observe when The salt ferric chloride is exposed to the atmosphere

Identify the cations in the following case:

NaOH solution, when added to the Solution (A), gives a reddish brown precipitate

Select from the list the gas that matches the description given in case

[ammonia, ethane, hydrogen chloride, hydrogen sulfide, ethyne]

This gas has a characteristic rotten egg smell.

If the empirical formula of a compound is CH and it has a vapor density of 13, find the molecular formula of the compound.

State one relevant observation for the following

When hydrogen sulfide gas is passed through lead acetate solution.

The acid on mixing with silver nitrate solution produces a white precipitate which is soluble in excess ammonium hydroxide

Give balanced chemical equations for Sodium ethanoate to methane.

Name the following:

The distinctive reaction that takes place when ethanol is treated with acetic acid.

Consider the following reaction and based on the reaction answer the questions that follow:

Calculate:

1) the quantity in moles of (NH₄)₂Cr₂O₇ if 63gm of(NH₄)₂Cr₂O₇ is heated.

2) the quantity in moles of nitrogen formed.

3) the volume in liters or dm3 of N2 evolved at S.T.P.

4) the mass in grams of Cr2O3 formed at the same time

(Atomic masses: H=1, Cr= 52, N=14]

 Explain the following:

Dilute nitric acid is generally considered a typical acid but not so in its reaction with metals.

Explain the following:

Concentrated nitric add appears yellow when it is left standing in a glass bottle.

Explain the following:

An all-glass apparatus is used in the laboratory preparation of nitric acid.

Fill in the blanks from the choices given within brackets:

The basicity of acetic acid is-------- (3, 1, 4).

Write a balanced equation for the action of heat on a mixture of copper and concentrated nitric acid.

Write a balanced equation for the action of dilute hydrochloric acid on sodium sulphide.

A compound made up of two elements X and Y has an empirical formula X₂Y. If the atomic weight of X is 10 and that of Y is 5 and the compound ha a vapor density 25, find its molecular formula.