19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Match the following (CPMT 2008) Column I Column II (A) 10 vol H2O2
One would expect proton to have very large (AIPMT 1993)
When CO2 is bubbled through a solution of barium peroxide in water
Which of the following metals evolves hydrogen on reacting with cold dilute HNO3? (AIPMT 1989)
Which of the following is a true structure of H2O2 in solid phase ? (a) (b) (c) (d)
The ionization of hydrogen atom would give rise to (AIPMT 1990)
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
Hydrogen peroxide molecules are (AIPMT 1991)
The formula of exhausted permutit is
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.
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
A water sample is said to contain permanent hardness if water contains
Which of the following is not a disadvantage of using hard water?
At its melting point, ice is lighter than water because (AIPMT 1992)
Perhydrol (B) 20 vol H2O2
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?
The density of water is less in its solid state because
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
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?
Which is not a property of water ?