19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
One would expect proton to have very large (AIPMT 1993)
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)
When CO2 is bubbled through a solution of barium peroxide in water
Hydrogen peroxide molecules are (AIPMT 1991)
The formula of exhausted permutit is
At its melting point, ice is lighter than water because (AIPMT 1992)
Which of the following is a true structure of H2O2 in solid phase ? (a) (b) (c) (d)
Which of the following groups of ions makes the water hard? (AIPMT 1994)
The hardness of water is estimated by
A water sample is said to contain permanent hardness if water contains
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 is not a disadvantage of using hard 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 compounds is used for water softening? (a) Ca PO (b) Na PO (c) Na P O (d) Na HPO
The temporary hardness of water due to calcium bicarbonate can be removed by adding
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
Liquid water is denser than ice due to
Presence of water can be detected by
The density of water is less in its solid state because
Which of the following reactions shows reduction of water ?
The formula for permutit or zeolite which is used as softener in ion-exchange method is