19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Para and ortho hydrogen differ in (RPMT 2010)
The ionization of hydrogen atom would give rise to (AIPMT 1990)
Hydrogen peroxide molecules are (AIPMT 1991)
Which of the following metals evolves hydrogen on reacting with cold dilute HNO3? (AIPMT 1989)
At its melting point, ice is lighter than water because (AIPMT 1992)
The formula of exhausted permutit is
Which of the following is a true structure of H2O2 in solid phase ? (a) (b) (c) (d)
When CO2 is bubbled through a solution of barium peroxide in water
Water gas is produced by (AIPMT 1992)
A water sample is said to contain permanent hardness if water contains
Which of the following is not a disadvantage of using hard water?
The temporary hardness of water due to calcium bicarbonate can be removed by adding
The hardness of water is estimated by
Which of the following compounds is used for water softening? (a) Ca PO (b) Na PO (c) Na P O (d) Na HPO
The formula for permutit or zeolite which is used as softener in ion-exchange method is
One would expect proton to have very large (AIPMT 1993)
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.
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
Which gas is produced when calcium nitride (Ca3N2) is hydrolysed by water?
Which of the following reactions shows reduction of water ?
Which is not a property of water ?
The density of water is less in its solid state because
Temporary hardness of water is due to the presence of
Liquid water is denser than ice due to