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VITEEE 2017 :: Chemistry :: General questions




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1.

If one strand of DNA has the sequence ATGCTTGA the sequence in the complimentary strand would be


A) TACGAACT

B) TCCGAACT

C) TACGTACT

D) TACGTAGT



2.

Which one of the following statements is not true regarding (+) Lactose?


A) On hydrolysis (+) Lactose gives equal amount of D(+) glucose and D(+) galactose.

B) (+) Lactose is a B-glycoside formed by the union of a molecule of D(+) glucose and a molecule of D(+) galactose

C) (+) Lactose is a reducing sugar and does not exhibit muta rotation.

D) $(+) Lactose, C_{12}H_{22}O_{11} contains 8-OH groups.$



3.

Which of the following has maximum number of lone pairs associated with Xe ?


A) $XeF_{4}$

B) $XeF_{6}$

C) $XeF_{2}$

D) $XeO_{3}$



4.

A certain reaction is non spontaneous at 298K. The entropy change during the reaction is 121 JK-1 . Is the reaction is endothermic or exothermic ? The minimum value of ΔH for the reaction is


A) endothermic, $\triangle H$ = 36.06kJ

B) exothermic, $\triangle H$ = -36.06kJ

C) endothermic, $\triangle H$ = 60.12kJ

D) exothermic, $\triangle H$ = -60.12kJ



5.

What is the R and S configuration for each stereogenic centre in this sugar from top to bottom ?

3152021473_25867_f4d818dab60c4a3baa405d09641b2b4b.png


A) R,R,S

B) R,S,S

C) R,S,R

D) S,S,R



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