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VITEEE 2018 :: Chemistry :: General questions




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11.

Nucleotide in DNA are linked by -


A) hydrogen bond

B) 3'-5' phosphodiester bond

C) glycosidic bond

D) peptide bond



12.

In the reaction :

2142021229_zrlmpskat3o2-q.jpeg


A) SiC

B) $H_{2}SO_{4}$

C) $KMnO_{4}$

D) Fe + HCI



13.

The energies E1 and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e., λ1 and λ2 will be :


A) $\lambda_{1}=\lambda_{2}$

B) $\lambda_{1}=2\lambda_{2}$

C) $\lambda_{1}=4\lambda_{2}$

D) $\lambda_{1}=1/2\lambda_{2}$



14.

Nitrosoamines (R2N - N = O) are soluble in water. On heating them with concentrated H2SO4, they give secondary amines. This reaction is called


A) Perkin reaction

B) Sandmeyer's reaction

C) Fitting reaction

D) Liebermann nitroso reaction



15.

In the silver plating of copper, K[Ag(CN)2] is used instead ofAgNO3. The reason is


A) a thin layer of Ag is formed on Cu

B) more voltage is required

C) Ag+ ions are completely removed from solution

D) less availability of $Ag^{+}$ions, as Cu cannot displace Ag from $[Ag(CN)_{2}]^{-} ion$



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