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VITEEE 2017 :: Chemistry :: General questions




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6.

Consider the reaction : N2 + 3H2 → 2NH3 carried out at constant temperature and pressure. If ΔH and ΔU are the enthalpy and internal energy changes for the reaction, which of the following expressions is true ?


A) $\triangle H>\triangle U$

B) $\triangle H<\triangle U$

C) $\triangle H=\triangle U$

D) $\triangle H=0$



7.

The optically active tartaric acid is named as D - (+) - tartaric acid because it has a positive


A) optical rotation and is drived from D - glucose

B) pH in organic solvent

C) optical rotation and is derived from D - (+) - glyceraldehyde

D) optical rotation when substituted by deuterium



8.

The number of stereoisomers possible for a compound of the molecular formula

CH3-CH=CH-CH(OH) - Me is:


A) 2

B) 4

C) 6

D) 3



9.

The values of Planck's constant is 6.63 x 1034 Js. The velocity of light is 3.0 x 108 m s-1. Which value is closest to the wavelength in nanometres of a quantum of light with a frequency of 8 x 1015 s-1?


A) $5\times10^{-18}$

B) $4\times10^{1}$

C) $3\times10^{7}$

D) $2\times10^{-25}$



10.

The half-life of the first-order reaction $CH_{3}CHO(g)\rightarrow CH_{4}(g)+ CO(g)$ If the initial pressure of CH3CHO (g) is 80 mm Hg and the total pressure at the end of 20 minutes is 120mmHg


A) 80 min

B) 120 min

C) 20 min

D) 40 min



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