Commercial sample of H₂O₂ is labeled as 10 V. Its % strength is nearly

• 3

• 6

• 9

• 12

The 4th higher homologue of ethane is

• butane

• pentane

• hexane

• heptane

Among the following, the one which is not a "green house gas", is

• N₂O

• CO₂

• CH₄

• O₂

The reagent with which the following reaction is best accomplished is

• H₃PO₂

• H₃PO₃

• H₃PO₄

• NaHSO₃

The most likely protonation site in the following molecule is

• C-1

• C-2

• C-3

• C-6

The order of decreasing ease of abstraction of hydrogen atoms in the following molecule

• H_a > H_b > H_c

• H_a > H_c > H_b

• H_b > H_a > H_c

• H_c > H_b > H_a

Among the following statements about the molecules X and Y, the one(s) which correct is (are)

• X and Y are diastereomers

• X and Y are enantiomers

• X and Y are both aldohexoses

• X is a D-sugar and Y is an L-sugar

38.

The electronic configuration of Cu is

• [Ne] 3s², 3p⁶, 3d⁹, 4s²

• [Ne] 3s², 3p⁶, 3d¹⁰, 4s¹

• [Ne] 3s², 3p⁶, 3d³, 3d⁹, 4s², 4p⁶

• [Ne] 3s², 3p⁶, 3d⁵, 4s², 4p⁴

The rate of a certain reaction is given by, rate = k [H⁺]ⁿ. The rate increases 100 times when the pH changes from 3 to 1. The order (n) of the reaction is

• 2

• 0

• 1

• 1.5

The correct statement regarding the following energy diagrams is

• Reaction M is faster and less exothermic than reaction N

• Reaction M is slower and less exothermic than reaction N

• Reaction M is faster and more exothermic than reaction N

• Reaction M is slower and more exothermic than reaction N