81. A first order Reaction has a specific reaction rate of 10-2 s-1. How much time will it take for 20 g of the reactant to reduce to 5 g?
(1) 238.6 second
(2) 138.6 second
(3) 346.5 second
(4) 693.0 second
Answer (2)
Sol.
82. Name the gas that can readily decolourises acidified KMn0 4 solution:
(1) CO 2
(2) SO 2
(3) NO 2
(4) P 205
Answer (2)
Sol. SO 2 is readily decolourises acidified KMnO4
83. The heating of phenyl-methyl ethers with HI produces.
(1) Ethyl chlorides
(2) Iodobenzene
(3) Phenol
(4) Benzene
Answer (3)
Sol.
84. Pick out the correct statement with respect [Mn(CN) 6]3- :
(1) It is sp3d2 hybridised and octahedral
(2) It is sp3d2 hybridised and tetrahedral
(3) It is d2sp3 hybridised and octahedral
(4) It is dsp2 hybridised and square planar
Answer (3)
Sol.
85. Ionic mobility of which of the following Alkali Metal Ions is lowest when aqueous solution of their salts are put under an electric field?
(1) Na
(2) K
(3) Rb
(4) Li
Answer (4)
Sol. Li+ being smallest, has maximum charge density
∴ Li+ is most heavily hydrated among all alkali metal ions. Effective size of Li + in aq solution is therefore, largest.
∴ Moves slowest under electric field.
86. The equilibrium constants of the following are.
Answer (2)
Sol.
87. Which of the following reactions is appropriate for converting acetamide to methanamine?
(1) Carbylamine reaction
(2) Hoffmann hypobromamide reaction
(3) Stephens reaction
(4) Gabriels phthalimide synthesis
Answer (2)
Sol.
88. Mechanism of a hypothetical reaction X2 + Y 2 —> 2XY is given below :
The overall order of the reaction will be
(1 ) 1
(2) 2
(3) 0
(4) 1.5
Answer (4)
Sol. The solution of this question is given by assuming step (i) to be reversible which is not given in question
Overall rate = Rate of slowest step (ii)
= k[X] [Y 2] …(1)
k = rate constant of step (ii)
Assuming step (i) to be reversible, its equilibrium constant,
89. The IUPAC name of the compound
(1) 3-keto-2-methylhex-4-enal
(2) 5-formylhex-2-en-3-one
(3) 5-methyl-4-oxohex-2-en-5-al
(4) 3-keto-2-methylhex-5-enal
Answer (1)
Sol.
Aldehydes get higher priority over ketone and alkene in numbering of principal C –chain
∴ 3-keto- 2 –methylhex-4-enal
90. Extraction of gold and silver involves leaching with CN – ion. Silver is later recovered by
(1) Liquation
(2) Distillation
(3) Zone refining
(4) Displacement with Zn
Answer (4)
Sol. Zn being more reactive than Ag and Au, displaces them.
From Native ore,
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