The combustion enthalpies of carbon , hydrogen and methane are -395.5 kJ mol⁻¹,-284.8 kJ mol⁻¹ and -890.4 kJ mol⁻¹ respectively at 25⁰ C. The value of standard formation enthalpies of methane at that temperature is […]
NaOH is prepared by the electrolysis of
Options
(a) aqueous solution of sodium chloride with platinum electrode (b) sodium chloride solution with graphite anode and iron cathode (c) sodium carbonate with platinum electrodes […]
Baking soda or baking powder is
Options
(a) washing soda (b) caustic soda (c) soda ash (d) sodium bicarbonate
Correct Answer:
sodium bicarbonate
Explanation:
No explanation available. Be the first to write the […]
Which of the following has a tendency for covalent compound formation
Options
(a) Na (b) Mg (c) Ca (d) Ba
Correct Answer:
Mg
Explanation:
No explanation available. Be the first to write the […]
Helium atom is two times heavier than a hydrogen molecule, At 298 K, the average kinetic energy of the helium atom is
Options
(a) two times that of a hydrogen molecule (b) same […]
Which of the following is true about ClO₂
Options
(a) It is paramagnetic (b) It dimerises in liquid phase (c) It is an liner molecule (d) It is very reactive
Correct Answer:
It […]
A gas z is bubbled through a solution containing x⁻ and y⁻. If the reduction potential are in the order x > y >z, then
Options
(a) y will oxidise z and not […]
CO₂ is liberated on adding sodium carbonate to a carboxylic acid.The carbon of CO₂ comes from
Options
(a) carboxylic group (b) carbonate (c) alkyl group (d) methyl
Correct Answer:
carbonate
Explanation:
No explanation […]
Oxidation state of sulphur in S₈, H₂S and S₂F₂ is
Options
(a) 0, -2, -1 (b) 0, 2, -1 (c) 1, -2, 1 (d) 0, -2, 1
Correct Answer:
0, -2, 1
Explanation: […]
Gametes are never hybrid. This is a statement of
Options
(a) law of dominance (b) law of independent assortment (c) law of segregation (d) law of random fertilisation
Correct Answer:
law of segregation
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