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

800 cm³ of gas is collected at 654 mm pressure. At what pressure would the volume of the gas reduce by 40% of its original volume, the temperature remaining constant?

A cylinder of 20 liters capacity contains gas at 100 atmospheric pressure. How many flasks of 200 cm³capacity can be filled from it at 1-atmosphere pressure, temperature remaining constant?

A sample of carbon dioxide occupies 30 cm³ at 15°C and 740 mm pressure. Find its volume at STP.

A given amount of gas A is confined in a chamber of constant volume. When the chamber is immersed in a bath of melting ice, the pressure of the gas is 100 cmHg.

1. What is the temperature when the pressure is 10cmHg?
2. What will be the pressure when the chamber is brought to 100°C

A gas is to be filled from a tank of capacity 10,000 litres into cylinders each having capacity of 10 litres. The condition of the gas in the tank is as follows:

1. The pressure inside the tank is 800 mm of Hg.
2. The temperature inside the tank is −3°C.

When the cylinder is filled, the pressure gauge reads 400 mm of Hg and the temperature is 270 K. Find the number of cylinders required to fill the gas.

Which will have greater volume when the following gases are compared at STP:

1. 1.2/N₂ at 25°C and 748 mmHg
2. 1.25/O₂ at STP 

Define S.T.P.

Why is it necessary to compare gases at S.T.P?

Write the value of:

the standard temperature in:

(i) °C 
(ii) K

Write the values of:

standard pressure in:

(i) atm
(ii) mm Hg
(iii) cm Hg
(iv) torr 

Correct the following statement:

The standard temperature is 25°C.

What temperature would be necessary to double the volume of a gas initially at s.t.p. if the pressure is decreased by 50%?

What do you observe when dilute sulphuric acid is added to the following:

Sodium carbonate

How will you distinguish sodium chloride, potassium chloride, and calcium chloride?

Explain how global warming takes place in the presence of green house gases. Give a reason why the surface temperature of earth is maintained in absence of green house gases.

‘Oxides of nitrogen namely nitrous oxide, are released into the atmosphere from varied sources’. Explain the statement with relevant sources.

Give balanced equation for the following conversion [one or two steps].

Nitrogen to nitrogen dioxide – in an internal combustion engine.