19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The hardness of water is estimated by
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 formula for permutit or zeolite which is used as softener in ion-exchange method is
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
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)
Hydrogen peroxide molecules are (AIPMT 1991)
At its melting point, ice is lighter than water because (AIPMT 1992)
Water gas is produced by (AIPMT 1992)
Tritium, a radioactive isotope of hydrogen, emits which of the following particles? (NEET 2021)
Match the following and identify the correct option. (NEET 2020) Column I Column II
The number of hydrogen bonded water molecule(s) associated with CuSO4.5H2O is (Odisha NEET 2019)
The method used to remove temporary hardness of water is (NEET 2019)
Which of the following statements about hydrogen is incorrect? (NEET 2016)
The moderator used in nuclear reactor is (UP CPMT 2014)
The laboratory method for the preparation of H2O2 is by (UP CPMT 2014)
Strength of H2O2 is 15.18 gL–1, then it is equal to (KCET 2014)
In which of the following reactions, H2O2 acts as a reducing agent? (EAMCET 2014) (a) H HOCl H O H O Cl O -> (b) OH Mn H O Mn 2OH -> (c) OH 2Fe H O 2Fe 2OH -> (d) H PbS s 4H O aq PbSO s 4H O l ->
30 volume hydrogen peroxide means (UK PMT 2014)
A commercial sample of H2O2 marked as 100 volume hydrogen peroxide, it means that (Manipal 2014)
The volume of oxygen evolved at STP by decomposition of 0.68 g ‘20 volume’ hydrogen peroxide solution is (MHT CET 2014)