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

A certain mass of gas occupied 850 ml at a pressure of 760 mm of Hg. On increasing the pressure it was found that the volume of the gas was 75% of its initial value. Assuming constant temperature, find the final pressure of the gas?

At a given temperature the pressure of a gas reduces to 75% of its initial value and the volume increases by 40% of its initial value. Find this temperature if the initial temperature was -10°C.

It is required to reduce the volume of a gas by 20% by compressing it at a constant pressure. To do so, the gas has to be cooled. If the gas attains a final temperature of 157°C, find the initial temperature of the gas.

Fill in the blank with the correct word, from the words in option:

If the temperature of a fixed mass of a gas is kept constant and the pressure is increased, the volume correspondingly _______.

Fill in the blank with the correct word, from the words in option:

At -273°C the volume of a gas is theoretically ______.

A fixed volume of a gas occupies 760cm³ at 27°C and 70 cm of Hg. What will be its vol. at s.t.p.

The pressure on one mole of gas at s.t.p. is doubled and the temperature is raised to 546 K. What is the final volume of the gas ? [one mole of a gas occupies a volume of 22.4 litres at stp.] 

On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.

A white substance which leaves an amphoteric oxide as a residue [whose colour varies in the heated and in the cold state] and evolves a gas which turns lime water milky.

On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.

An efflorescent substance which leaves a residue having the same colour as the substance and evolves a gas which changes the colour of cobalt chloride paper.

The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of aluminium

How does fused calcium chloride differ from iron [III] chloride when exposed to the atmosphere?

The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of phosphorus

Complete and balance the equation:

[General method]

Reactions of active metals - cold water

Potassium- K + H₂O → ______+ ______ [g]

Complete and balance the equation:

[General method]

Reactions of active metals - cold water

Sodium - 2Na + 2H₂O → ______+ _______ [g]

Complete and balance the equation:

[General method]

Reactions of active metals - cold water

Calcium - Ca + H₂O → ______+ _______ [g]

Complete and balance the equation:

[General method]

Reactions of metals with steam

Magnesium - Mg + H₂O → ______+ _______ [g]

Complete and balance the equation:

[General method]

Reactions of metals with steam

Aluminium - 2Al + 3H₂O → ______+ _______ [g]

Complete and balance the equation:

[General method]

Reactions of metals with steam

Zinc - Zn + H₂O → ______+ _______ [g]

Complete and balance the equation:

[General method]

Reactions of metals with steam

Iron - 3Fe + 4H₂O ⇌ ______+ _______ [g]

Complete and balance the equation:

[General method]

Reactions of metals with dilute acids

Magnesium - Mg + 2HCl → ______+ _______ [g]