19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which one of the following processes will produce hard water? (RPMT 2008)
If 11.1 mg of CaCl2 and 12 mg of MgSO4 are present in 2 L of water, what is its hardness (in gram CaCO3 / ppm)? (EAMCET 2008)
Match the following (CPMT 2008) Column I Column II (A) 10 vol H2O2
Perhydrol (B) 20 vol H2O2
5.358 N (C) 30 vol H2O2
1.785 M (D) 100 vol H2O2
3.03% w/V The correct match is
Which one of the following is non-reducing? (J&K CET 2009)
Which one of the following statements is incorrect with regard to ortho and para dihydrogen? (Kerala CEE 2009)
Semi-water gas is a mixture of (UP CPMT 2010) (a) CO H (b) CO N (c) CO H N (d) H CH
Some statements about heavy water are given below. (i) Heavy water is used as moderator in nuclear reactors. (ii) Heavy water is more associated than ordinary water. (iii) Heavy water is more effective solvent than or…
The degree of hardness of water is usually expressed in terms of (AMU 2010)
Permanent hardness of water can be removed by adding (AFMC 2010)
Which of the following is responsible for the permanent hardness of water? (CPMT 2010)
What is structure of H2O2? (MP PMT 2010) (a)
Para and ortho hydrogen differ in (RPMT 2010)
Hydrogen sulphide is acidic while water is neutral. The reason is (RPMT 2010)
What is heavy water? (Haryana PMT 2010) (a) H O (b) H O
Permanent hardness of water is due to the presence of (Kerala CEE 2011)
Hydrogen is prepared from H2O by adding (DUMET 2011)
Then zeolite is treated with hard water, the sodium ions are exchanged with (AMU 2012)
The normality of 20 volume hydrogen peroxide solution is (AMU 2012)
Which of the following is electron-deficient? (NEET 2013)
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 ->
The volume of oxygen evolved at STP by decomposition of 0.68 g ‘20 volume’ hydrogen peroxide solution is (MHT CET 2014)