Last seen: Sep 10, 2021
(a) Mercury (b) Sodium (c) Silver/copper (d) Lead/mercury
(c) 4C Explanation: Lattice energy = In NaCl the product of charges = 1 × 1; In CaO product of charges = 2 × 2 = 4 while the interionic dist...
Correct answer: (a) sp3 Explanation: figure.png Hybridisation of H2SO3 = (6 + 2 + 0) = 4 = sp3
Correct answer: (b) ZnCl2 Explanation: Polarizing power of Zn2+ is more than others, hence ZnCl2 is least ionic in nature.
Correct answer: (b) from sp2 to sp3 Explanation: In BF3, B is sp2 hybridized with one empty pz orbital. The empty pz orbital of BF3 can be filled ...
Correct answer: (d) BF4-, CCl4, NH4+, PCl4+ Explanation: All have tetrahedral structure.
Correct answer: (b) NH3 has a higher boiling point than that of HF. Explanation: Due to high EN of F than N, H-bonding is stronger in HF than NH3 ...
Correct answer: (c) K+ and [HF2]- Explanation: Since F form H-bond [HF2]- exists. Therefore KHF2 gives K+ + HF2-
Correct answer: (b) 1, 2, 5 Explanation: SeF4 has distorted tetrahedral geometry while CH4 has tetrahedral geometry.
Correct answer: (d) sp3d2 hybridization Explanation: figure.png sp3d2 hybridisation Number of 90° angle between bonds = 12
Correct answer: (b) FeCl3 is more covalent than FeCl2. Explanation: According to Fajan's rule, higher charge on the ions, more covalent is the com...
(a) X is carbon dioxide; Y is calcium carbonate; Z is calcium hydrogen carbonate. (b) 1. CaCO3 + 2HCl → CaCl2 + H2O + CO2 2. Ca(OH)2(aq) + CO2(g) ...
(a) Hydrogen. (b) Activity: Take solutions of glucose, alcohol, hydrochloric acid and sulphuric acid. Fix two nails on a cork, and place the cork ...
Activity: Take about 1g solid NaCl in a clean and dry test tube and add some concentrated sulphuric acid to it. Fit a rubber cork with a small deliv...
(a) When an acid reacts with a metal carbonate, then a salt, carbon dioxide and water are produced. Example: When dilute hydrochloric acid reacts wi...
(a) The acidic behavior of an acid is due to the presence of hydrogen ions [H+(aq) ions] which are produced only when acids are dissolved in water. In...
(a) Salt and water. (b) Because dry HCl gas has no hydrogen ions (H+ ions) in it which can impart acidic properties to it. (c) Pink.
Curd and other sour substances contains acids which can react with the metals of brass and copper vessels to form toxic (poisonous) metal compounds wh...
The reaction between an acid and a base to form salt and water is called a neutralisation reaction. When hydrochloric acid reacts with sodium hydroxid...
The acidic character of a substance is due to the presence of hydrogen ions [H+(aq) ions] in its aqueous solution. HCl, H2SO4 etc. show acidic propert...