1 mole of gas occupying 3 L volume is expanded against a constant external pressure of 1 atm to a volume of 15 L. The work done by a system is equal to

• -1.215 × 10³ J

• -12.15 × 10³ J

• +1.215 × 10³ J

• +12.15 × 10³ J

The ${\mathrm{E}}_{{\mathrm{M}}^{2+}/ {\mathrm{M}}^{2+}}^{°}$ value for Cr, Mn, Fe and Co are -0.41, +0.77 and +1.97 V respectively. For which one of these metals the change in oxidation state from +2 to +3 is easiest?

• Cr

• Mn

• Fe

• Co

23.

The oxidation numbers of phosphorus in Ba(H₂PO₂) and xenon in Na₄XeO₆ respectively are

• +3 and +4

• +2 and +6

• +1 and +8

• -1 and -6

Setting of plaster of Paris is

• dehydration

• oxidation with atmospheric oxygen

• combination with atmospheric CO₂

• hydration to yield another hydrate

In the following compound, groups designated as A, B, C will be numbered as

• 3, 2, 1

• 6, 1, 2

• 3, 1, 2

• 1, 2, 3

The following compound can exhibit

• geometrical isomerism

• geometrical and optical isomerism

• optical isomerism

• tautomerism

The IUPAC name for

CH₃CH=CHCH₂C(NH₂)H-CH₂-COOH

• 5-amino-2-heptenoic acid

• 5-amino hex-2-ene-carboxylic aod

• 3-amino-5-heptenoic acid

• β-amino-δ-heptenoic acid

Which is not an electrophile?

• $\stackrel{+}{\mathrm{C}}$H₅

• $\stackrel{+}{\mathrm{C}}$H₃

• BF₃

• SO₃

Petroleum is obtained from water gas, name of the reaction involved is

• Fischer-Tropsch

• Benzoic

• Dow's

• Kjeldahl's

Which of the following is correct increasing order for the value of $\frac{\mathrm{e}}{\mathrm{m}}$ ?

• e < p < n < α

• n < p < e < α

• n < p < α < e

• n < α < p < e