Unit - Hydrogen I Choose the best answer: . (c) . (c) CO + H . (b) .
(d) group one elements . (c) 1p+2n . (a) Palladium, Vanadium . (a) .
(a) . g . (d) EDTA . (c) CaCl .
(a) sodium aluminium silicate . (a) . (c) CrO(O ) . (c) / .
(d) . . (d) sp and sp . (c) monobasic acid .
(a) tetrahedrally by -H atoms . (b) intra-molecular hydrogen bonding and inter molecular hydrogen bonding . (c) both (a) & (b) ) (c) amphoteric oxide Key for multiple choice questions: ) Option (c) Correct statement : Hydrogen has three isotopes of which protium is the most common. ) Option (c) CO + H - Water gas ) Option (b) Correct statement : Ortho isomer - one nuclear spin Para isomer - zero nuclear spin ) Option (d) eg : Sodium hydride (Na + H – ) ) Option (c) T (1e – , 1p, 2n) ) Option (a) Ca + + Na CO → CaCO ↓ + 2Na + ) mass of deuterium = × mass of protium If all the .
g hydrogen is replaced with deuterium, the weight will become .4g. Hence the increase in body weight is ( . – . = .
g) Option (a) ) EDTA (option (d)) ) Permanent hardness if water is due to the presence of the chlorides, nitrates and sulphates of Ca + and Mg + ions. Option (c) CaCl EVALUATION 11th Std Chemistry 11th Std Chemistry - - - - ) Zeolite is sodium aluminium silicate. (NaA l Si O . H O) Option (a) ) (a) mL of H O will give 100ml O at STP.
) Cr O – 2H + 4H O → 2CrO(O ) + 5H O Option (c) ) 2MnO – + 5H O (aq) + 6H + → 2Mn + + 5O + 8H O Option (c) / moles ) Volume strength of hydrogen peroxide = Normality of hydrogen peroxide × . = . × . = .
Option (d) H O H O O g litres ( ) ( ) → ↑ Volume strength of Hydrogeen peroxide Normality Equivalent weight of H O . Normality Volume strength of hydrogen peroxide = Normality . ) sp and sp Option (d) ) Hypophosphorus acid on reaction with D O, only one hydrogen is replaced by deuterium and hence it is mono basic O P H H O – H Option (c) monobasic acid ) (a) tetrahedrally surrounded by hydrogen atoms (refer . (a) Structure of ice) ) o -nitro phenol O O O N H p - nitro phenol OH N O O No H O Option (b) ) Heavy water is used as moderator as well as coolant in nuclear reactions.
Option (c) ) Water is a amphoteric oxide. Option (c) 11th Std Chemistry 11th Std Chemistry - - - -