Chemistry Question Bank

One would expect proton to have very large (AIPMT 1993)

At its melting point, ice is lighter than water because (AIPMT 1992)

The O – O – H bond angle in H2O2(g) is about (AIPMT 1994)

Which of the following metals evolves hydrogen on reacting with cold dilute HNO3? (AIPMT 1989)

The ionization of hydrogen atom would give rise to (AIPMT 1990)

Hydrogen peroxide molecules are (AIPMT 1991)

Which of the following groups of ions makes the water hard? (AIPMT 1994)

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

The formula of exhausted permutit is

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

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

The volume strength of 1.5 N H2O2 solution is (AIPMT 1997)

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

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

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

Temporary hardness of water is due to the presence of

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

Which of the following reactions shows reduction of water ?

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

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

Presence of water can be detected by

Number of parts by weight of calcium carbonate present in …….defined as the degree of hardness of water. Fill the blank with an appropriate statement.

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?

Which is not a property of water ?