Chemistry Question Bank

The process of production of syngas coal is quite common these days. The production of syngas from coal is called

Which of the following metals will react with NaOH and KOH to liberate hydrogen gas?

Which of the following metals does not liberate hydrogen from acids?

Pure nascent hydrogen is best obtained by

Very pure hydrogen (99.9%) can be made by which of the following processes?

The hardness of water is estimated 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.

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

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

Temporary hardness of water is due to the presence of

Which of the following reactions shows reduction of water ?

Presence of water can be detected by

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

Liquid water is denser than ice due to

The density of water is less in its solid state because

Which is not a property of water ?

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?

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

How many hydrogen bonded water molecules are associated with CuSO4.5H2O?

The maximum number of hydrogen bonds formed by a water molecule in ice is

Hydrolysis of SiCl4 gives

What is the reaction given below called? aq aq H O H O H O OH l l

Which one of the following statements about water is FALSE?

What is meant by demineralized water ?