Last seen: Dec 29, 2021
Correct answer: (b) Water gas Explanation: CO + H2 + H2O + catalyst → CO2 + 2H2
Correct answer: (b) 25% para + 75% ortho Explanation: It is a fact.
Correct answer: (a) 1 : 1 Explanation: Zn + H2SO4 → ZnSO4 + H2 Zn + 2NaOH → Na2ZnO2 + H2 ∴ Ratio of volumes of H2 evolved is 1 : 1.
Correct answer: (b) 6% Explanation: ∵ 22.4 litre O2 at N.T.P. obtained by 68 gm of H2O2 ∴ 1 litre O2 at N.T.P. obtained by gm of H2O2 ∴ 20 lit...
Correct answer: (a) 25.5 g Explanation: Molecular weight of H2O2 = 34 Equivalent weight of H2O2 = 17 ∴ 1 L of 1 N H2O2 has = 17 g of H2O ...
Correct answer: (b) It gives precipitate Explanation: 2RCOONa + Mg2+ → (RCOO)2Mg + 2Na+ 2RCOONa + Ca2+ → (RCOO)2Ca + 2Na2+
Correct answer: (d) recapitulation
Correct answer: (a) recapitulation theory
Correct answer: (c) Prevalence of pesticide-resistant insects
Correct answer: (c) natural selection
Correct answer: (a) natural selection
Correct answer: (d) Flipper of penguin and dolphin are analogous organs.
Correct answer: (b) 14C
Correct answer: (b) reptiles gave rise to birds during Jurassic period
Correct answer: (c) Charles Darwin
Correct answer: (c) Ma lay Archipelago
Correct answer: (d) reproductive fitness of an organism.
Correct answer: (a) HMS Beagle
Correct answer: (b) 900 c.c.
Correct answer: (a) Australopithecus