Chemistry Question Bank

Para and ortho hydrogen differ in (RPMT 2010)

Hydrogen sulphide is acidic while water is neutral. The reason is (RPMT 2010)

What is heavy water? (Haryana PMT 2010) (a) H O (b) H O

Permanent hardness of water is due to the presence of (Kerala CEE 2011)

Hydrogen is prepared from H2O by adding (DUMET 2011)

Then zeolite is treated with hard water, the sodium ions are exchanged with (AMU 2012)

Hydrogen peroxide molecules are (AIPMT 1991)

The temporary hardness of water due to calcium bicarbonate can be removed by adding

The formula for permutit or zeolite which is used as softener in ion-exchange method is

Which of the following is not a disadvantage of using hard water?

The formula of exhausted permutit is

The hardness of water is estimated by

Which of the following is a true structure of H2O2 in solid phase ? (a) (b) (c) (d)

A water sample is said to contain permanent hardness if water contains

When CO2 is bubbled through a solution of barium peroxide in water

Which of the following reactions shows reduction of water ?

Temporary hardness of water is due to the presence of

Presence of water can be detected by

The exhausted cation and anion exchange resin beds are regenerated by treatment with

Liquid water is denser than ice due to

Which gas is produced when calcium nitride (Ca3N2) is hydrolysed by water?

Given below are two reactions of water with sodium and carbon dioxide. What is the nature of water in these reactions? (i) 2Na + 2H2O -> 2NaOH + H2 (ii) 6CO2 + 12H2O -> C6H12O6 + 6H2O + 6O2

Which of the following compounds is used for water softening? (a) Ca PO (b) Na PO (c) Na P O (d) Na HPO

In which of the following reactions H2O acts as a bronsted acid? (a) 3 aq aq 4 aq H O NH OH NH l (b) aq aq aq H O H S H O HS l (c) aq aq H O H O H O OH l l (d) aq aq H OH H O ( ) ( ) l

Water plays a key role in the biosphere. It is due to certain properties of H2O as compared to other liquids. Which of these is not a correct property of water?