Which is true for a cyclic process?

• ΔE= 0

• ΔE= q- W

• q =W

• All of these

If in the reaction N₂O₄ $\rightleftharpoons$2NO₂: $\mathrm{\alpha }$ is the degree of dissociation of N₂O₄ then total number of moles at equilibrium is

• (1-α)

• (1+α)

• (1-α)²

• (1+α)²

To convert 94 g of ice at 0°C into 94g of vapour at 100° C, the quantity of coal (90% carbon) required is : (ΔH_c of carbon = -94 k cal mol^-1);latent heat of fusion = + 80 cal per gm; latent heat ofvaporisation=+ 540 cal per gm; specificheat of water = 1 cal per gm per °C).

• 94g

• 80g

• 9.4g

• 9.6 g

The ratio of de-Broglie wavelengths for electron accelerated through 200 V and 50 V is

• 1:2

• 2:1

• 3:10

• 10:3

The nuclear reaction, ${}_{13}{}^{27}\mathrm{Al} + {}_2{}^4\mathrm{He} \to {}_{14}{}^{30}\mathrm{Si} + {}_1{}^1\mathrm{H}$ is

• nuclear fusion

• nuclear fission

• nuclear transmutation

• artificial radioactivity

6.

An organic compound A contains 20% C, 46.66% N and 6.66% H. It gives NH₃ gas on heating with NaOH. A can be

• CH₃CONH₂

• C₆H₅CONH₂

• NH₂CONH₂

• CH₃NHCONH₂

In the equilibrium mixture, KI+ I₂ $\rightleftharpoons$KI₃ the concentration of KI and I₂ and three fold respectively . The concentration of KI₃ becomes

• two fold

• three fold

• five fold

• six fold

Lithium is the strongest reducing agent because of

• its greater hydration energy

• its high ionization energy

• its high electron affinity

• its low electronegativity

In qualitative analysis, NH₄Cl is added before NH₄OH

• to increase [OH^-] concentration

• for making HCl

• to decrease [OH^-] concentration

• Statment is wrong

C₂H₅Cl $\underset{\mathrm{CuI}}{\overset{\mathrm{Li}}{\to }} \stackrel{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}}{\to } \mathrm{n}-\mathrm{butane}$. This method is

• Wurtz synthesis

• Kolbe synthesis

• Corey House synthesis

• Friedel-Craft synthesis