Chemistry Question Bank

The volume of oxygen evolved at STP by decomposition of 0.68 g ‘20 volume’ hydrogen peroxide solution is (MHT CET 2014)

Role of hydrogen peroxide in the below reactions is respectively (CBSE AIPMT 2014) I. H O O H O 2O -> II. H O Ag O 2Ag H O O ->

Which of the following is electron-deficient? (NEET 2013)

Which of the following reactions shows reduction of water ?

The normality of 20 volume hydrogen peroxide solution is (AMU 2012)

Then zeolite is treated with hard water, the sodium ions are exchanged with (AMU 2012)

Hydrogen is prepared from H2O by adding (DUMET 2011)

Permanent hardness of water is due to the presence of (Kerala CEE 2011)

What is heavy water? (Haryana PMT 2010) (a) H O (b) H O

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

Para and ortho hydrogen differ in (RPMT 2010)

What is structure of H2O2? (MP PMT 2010) (a)

Which of the following is responsible for the permanent hardness of water? (CPMT 2010)

The method used to remove temporary hardness of water is (NEET 2019)

The number of hydrogen bonded water molecule(s) associated with CuSO4.5H2O is (Odisha NEET 2019)

Match the following and identify the correct option. (NEET 2020) Column I Column II

Tritium, a radioactive isotope of hydrogen, emits which of the following particles? (NEET 2021)

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

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