19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The formula of Calgon, used for water softening is (EAMCET 2007)
Radioactive isotope of hydrogen is (RPMT 2007)
Which one of the following processes will produce hard water? (RPMT 2008)
Which of the following statements regarding hydrides is not correct?
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 of the following is incorrect? (BHU 2008)
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)
Given below are the elements and the type of hydrides formed by them. Mark the incorrect match.
Non-stoichiometric hydrides are produced by
On moving from left to right in a period what is the order of acidic character of hydrides?
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