19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The formula of exhausted permutit is
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)
Permanent hardness of water can be removed by adding (AFMC 2010)
The degree of hardness of water is usually expressed in terms of (AMU 2010)
Hardness of water is due to the presence of salts of (AMU 2007)
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)
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
Water plays a key role in the biosphere. It is due to certain properties of H2O as compared to other liquids. Which of these is not a correct property of water?
Temporary hardness of water is due to the presence of
Which of the following metals will react with NaOH and KOH to liberate hydrogen gas?
What is meant by demineralized water ?
The HOH angle in water molecule is about