19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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)
A commercial sample of H2O2 marked as 100 volume hydrogen peroxide, it means that (Manipal 2014)
30 volume hydrogen peroxide means (UK PMT 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 ->
Strength of H2O2 is 15.18 gL–1, then it is equal to (KCET 2014)
The laboratory method for the preparation of H2O2 is by (UP CPMT 2014)
The moderator used in nuclear reactor is (UP CPMT 2014)
The method used to remove temporary hardness of water is (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)
Consider the following statements: 1. Atomic hydrogen is obtained by passing hydrogen through an electric arc. 2. Hydrogen gas will not reduce heated aluminium oxide. 3. Finely divided palladium absorbs large volume o…
Which of the following reaction produces hydrogen?
Phosphorus cannot form PH5 with its outer electronic configuration as 3s2, 3p3 because
Which of the statements given below are true for the water molecule structure? (i) Oxygen undergoes sp3hybridisation. (ii) Due to presence of two lone pairs of electrons on oxygen the H–O–H bonds angle is 118.4°. (ii…
During hydrate formation from aqueous solution, water can be associated in different forms. Indicate the wrong combination. (i) Coordinated water – [Cr(H2O)6]3+ 3Cl– (ii) Interstitial water – BaCl2.2H2O (iii) Hydrogen…
Match the column I with column II and mark the appropriate choice. Column I Column II (A) Syngas (i) Na6P6O18 (B) Calgon (ii) NaAlSiO4 (C) Permutit (iii) CO + H2 (D) Producer gas (iv) CO + N2
Match the column I with column II and mark the appropriate choice. Column I Column II (A) Clark’s method (i) Na6P6O18 (B) Calgon’s method (ii) NaAlSiO4 (C) Ion-exchange method (iii) RSO3H (D) Synthetic resins method (…
The molecular formula of a commercial resin used for exchanging ions in water softening is C8H7SO3Na (Mol. wt. 206). What would be the maximum uptake of Ca2+ ions by the resin when expressed in mole per gram resin?
Which of the following reactions is not used in preparation or deuterium compounds using heavy water?