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

Calculate the relative molecular mass of:

(NH₄)₂ Cr₂O₇

Find the weight of 0.5 mole of O₂.

Find the weight of 0.2 mole of H₂ gas.

Which of the following would weigh most?

Which of the following contains maximum number of molecules?

Calculate the number of hydrogen atoms in 0.1 mole of H₂SO₄.

The mass of 5.6 litres of a certain gas at S.T.P. is 12 g. What is the relative molecular mass or molar mass of the gas?

Calculate the volume occupied at S.T.P. by 2 moles of SO₂.

Calculate the number of atoms of each kind in 5.3 grams of sodium carbonate.

Calculate the mass of nitrogen supplied to soil by 5 kg of urea [CO(NH₂)₂].

[O = 16; N = 14; C = 12; H = 1]

What do you understand by the statement that ‘vapour density of carbon dioxide is 22’?

The atomic mass of Chlorine is 35.5. What is its vapour density?

Correct the statement, if required.

Under similar conditions of temperature and pressure, two volumes of hydrogen combined with two volumes of oxygen will give two volumes of water vapour.

A gas cylinder filled with hydrogen holds 5 g of the gas. The same cylinder holds 85 g of gas X under the same temperature and pressure. Calculate the vapour density of gas X.

A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure. What mass of carbon dioxide can it hold under similar conditions of temperature and pressure?

If a crop of wheat removes 20 kg of nitrogen per hectare of soil, what mass of the fertilizer, calcium nitrate Ca(NO₃)₂ would be required to replace the nitrogen in a 10 hectare field?

When heated, potassium permanganate decomposes according to the following equation :

\[\ce{2KMnO4 -> \underset{\text{solid residue}}{K2MnO4 + MnO2} + O2}\]

(a) Some potassium permanganate was heated in the test tube. After collecting one litre of oxygen at room temperature, it was found that the test tube had undergone a loss in mass of 1.32 g. If one litre of hydrogen under the same conditions of temperature and pressure has a mass of 0.0825 g, calculate the relative molecular mass of oxygen.

(b) Given that the molecular mass of potassium permanganate is 158. What volume of oxygen (measured at room temperature) would be obtained by the complete decomposition of 15.8 g of potassium permanganate? (Molar volume at room temperature is 24 litres)

Ammonia burns in oxygen and the combustion, in the presence of a catalyst, may be represented by;

\[\ce{2NH3 + 2 1/2O2 -> 2NO + 3H2O}\] [H = 1, N = 14, O = 16]

What mass of steam is produced when 1.5 g of nitrogen monoxide is formed?

Write an equation for the reaction of hydrochloric acid on manganese (IV) oxide.

Write a balanced equation for the following conversion:

Sodium chloride from sodium sulphite and dilute hydrochloric acid.