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VITEEE 2017 :: Chemistry :: General questions




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16.

Knowing that the chemistry of lanthanoids(Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?


A) The ionic size of Ln (III) decrease in general with increasing atomic number

B) Ln (III) compounds are generally colorless.

C) Ln (III) hydroxide are mainly basic in character

D) Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character.



17.

An organic compound (A) on reduction gives compound(B). (B) on treatment with CHCl3, and alcoholic KOH gives (C). (C) on catalytic reduction gives N-methyl aniline. The compound A is


A) Methylamine

B) Nitromethane

C) Aniline

D) Nitrobenzene



18.

Standard entropies of X2 , Y2 and XY3 are 60, 30 and 50 JK-1 mol-1 respectively. For the reaction

$\frac{1}{2}X_{2}+ \frac{3}{2}Y_{2}\rightleftharpoons XY_{3} \triangle H = - 30KJ$ to be at equilibrium, the temperature should be


A) 750K

B) 1000K

C) 1250K

D) 500 K



19.

A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution gives


A) benzyl alcohol and sodium formate

B) sodium benzoate and methyl alcohol

C) sodium benzoate and sodium formate

D) benzyl alcohol and methyl alcohol



20.

The half-life period of a first-order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2 = 0.301)


A) 23.03 minutes

B) 46.06 minutes

C) 460.6 minutes

D) 230.03 minutes



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