19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The volume strength of 1.5 N H2O2 solution is (AIPMT 1997)
Hydrogen peroxide molecules are (AIPMT 1991)
At its melting point, ice is lighter than water because (AIPMT 1992)
Which one of the following pairs of substances on reaction will not evolve H2 gas? (AIPMT 1998)
Water gas is produced by (AIPMT 1992)
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
The formula of exhausted permutit is
Which of the following metals evolves hydrogen on reacting with cold dilute HNO3? (AIPMT 1989)
Which of the statements given below are true for the water molecule structure? (i) Oxygen undergoes sp3hybridisation. (ii) Due to presence of two lone pairs of electrons on oxygen the H–O–H bonds angle is 118.4°. (ii…
The ionization of hydrogen atom would give rise to (AIPMT 1990)
The hardness of water is estimated by (Manipal 2004)
Semi-water gas is a mixture of (UP CPMT 2010) (a) CO H (b) CO N (c) CO H N (d) H CH
Which of the following compounds is used for water softening? (a) Ca PO (b) Na PO (c) Na P O (d) Na HPO
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 exhausted cation and anion exchange resin beds are regenerated by treatment with
The hardness of water is estimated by
Presence of water can be detected by
Which of the following reactions shows reduction of water ?
A water sample is said to contain permanent hardness if water contains
Temporary hardness of water is due to the presence of
The density of water is less in its solid state because
Liquid water is denser than ice due to
Which is not a property of water ?
Which gas is produced when calcium nitride (Ca3N2) is hydrolysed by water?