HSC Science कक्षा ११ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

Give the systematic name for the following.

Washing soda

Give the systematic name for the following.

Soda ash

Give the systematic name for the following.

Trona

When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules

Equal weights of methane and oxygen are mixed in an empty container at 298 K. The fraction of total pressure exerted by oxygen is

A bottle of ammonia and a bottle of HCl connected through a long tube are opened simultaneously at both ends. The white ammonium chloride ring first formed will be

The value of the gas constant R is

Consider the following statements

i) Atmospheric pressure is less at the top of a mountain than at sea level

ii) Gases are much more compressible than solids or liquids

iii) When the atmospheric pressure increases the height of the mercury column rises

Select the correct statement

If the temperature and volume of an ideal gas is increased to twice its values, the initial pressure P becomes

At identical temperature and pressure, the rate of diffusion of hydrogen gas is `3sqrt3` times that of a hydrocarbon having molecular formula C_nH_2n–2. What is the value of n?

Equal moles of hydrogen and oxygen gases are placed in a container, with a pin-hole through which both can escape what fraction of oxygen escapes in the time required for one-half of the hydrogen to escape.

The variation of volume V, with temperature T, keeping the pressure constant is called the coefficient of thermal expansion ie α = `1/"V"((∂"V")/(∂"T"))_"P"`. For an ideal gas α is equal to

What is the density of N₂ gas at 227°C and 5.00 atm pressure? (R = 0.082 L atm K^–1 mol^–1)

What are ideal gases?

Give a suitable explanation for the following facts about gases.

Gases don’t settle at the bottom of a container

Suggest why there is no hydrogen (H₂) in our atmosphere. Why does the moon have no atmosphere?

Would it be easier to drink water with a straw on the top of Mount Everest?

Why do astronauts have to wear protective suits when they are on the surface of the moon?

Argon is an inert gas used in light bulbs to retard the vaporization of the tungsten filament. A certain light bulb containing argon at 1.2 atm and 18°C is heated to 85°C at constant volume. Calculate its final pressure in atm.

A tank contains a mixture of 52.5 g of oxygen and 65.1 g of CO₂ at 300 K the total pressure in the tanks is 9.21 atm. Calculate the partial pressure (in atm.) of each gas in the mixture.