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26.

 The hyper conjugative stabilities of tert-butyl cation and 2-butene , respectively, are due to 


A) $\sigma\rightarrow p$ (empty) and $\sigma\rightarrow \pi^{*}$ electron delocalisations

B) $\sigma\rightarrow \sigma^{*}$ and $\sigma\rightarrow \pi$ electron delocalisations

C) $\sigma\rightarrow p$ (filled) and $\sigma\rightarrow \pi^{}$ electron delocalisations

D) $p(filled)\rightarrow \sigma^{*}$ and $\sigma\rightarrow \pi^{*}$ electrons delocalisations



27.

The initial rate of hydrolysis of methyl acetate (1M)  by a weak acid (HA,1M) is 1/100 th of that  of a strong acid  (HX,1M), at 25° C. the Ka  (HA) is 


A) $1\times 10^{-4}$

B) $1\times 10^{-5}$

C) $1\times 10^{-6}$

D) $1\times 10^{-3}$



28.

 The pair(s)  of coordination complexes/ions exhibiting the same kind of isomerism is (are)


A) $[Cr(NH_{3})_{5}Cl]Cl_{2} and [Cr(NH_{3})_{4}Cl_{2}]Cl$

B) $[Co(NH_{3})_{4}Cl_{2}]^{+} and [Pt(NH_{3})_{2}(H_{2}0)Cl]^{+}$

C) $[CoBr_{2}Cl_{2}]^{2+} and [PtBr_{2}Cl_{2}]^{2-}$

D) $[Pt(NH_{3})_{3}NO_{3}]Cl and [Pt(NH_{3})_{3}Cl]Br$



29.

Benzene and naphthalene form an ideal  solution at room temperature . For this process , the true statement (s) is (are)


A) $\triangle G$ is positive

B) $\triangle S_{system}$ is positive

C) $\triangle S_{surroundings}$=0

D) $\triangle H$ =0



30.

Sulphide ores are common  for metals


A) Ag, Cu and Pb

B) Ag, Cu and Sn

C) Ag, Mg and Pb

D) Al, Cu, and Pb



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