Which is correct regarding size of atom?

• N < O

• B < Ne

• V > Ti

• Na > K

Which of the following is not sp² hybridised?

• Graphite

• Graphene

• Fullerene

• Dry ice

A diatomic gas at pressure P, compressed adiabatically to half of its volume, what is the final pressure?

• (2)^1.4P

• P/(2)^1.4

• (2)^5/3P

• P/(2)^5/3

4.

Choose the correctly paired gaseous cation and its magnetic (spin only) moment (in B.M.)

• Ti²⁺,3.87 B.M.

• Cr²⁺, 4.90 B.M.

• Co³⁺,3.87 B.M.

• Mn²⁺,4.90 B.M.

The equilibrium constant for the reaction,

$\frac{1}{2}$${{\text{H}}_2}_{\left(g\right)}$$+$$\frac{1}{2}$${\text{I}}_{2_{\left(g\right)}}$$\rightleftharpoons$HI_(g) is K_c

Equilibrium constant for the reaction 2HI_(g) $\rightleftharpoons$H_2(g) + I_2(g)  will be

• 1/K_c

• 1/(K_c)²

• 2/K_c

• 2/(K_c)²

Which of the following pairs represent isotones?

• ${}_{33}{}^{77}\mathrm{As},{}_{34}{}^{ 78}\mathrm{Se}$

• ${}_{78}{}^{195}\mathrm{Pt},{}_{76}{}^{190}\mathrm{Os}$

• ${}_{47}{}^{108}\mathrm{Ag},{}_{48}{}^{112}\mathrm{Cd}$

• ${}_{72}{}^{178}\mathrm{Hf},{}_{56}{}^{137}\mathrm{Ba}$

In O₃ molecule, the formal charge on the central O-atom is

• 0

• -1

• -2

• +1

Which of the following represents the correct bond order?

• $O_2^{+}<O_2^{-}>O_2^{2-}$

• $O_2^{-}>O_2^{2-}>O_2^{+}$

• $O_2^{2-}>O_2^{+}>O_2^{-}$

• $O_2^{+}>O_2^{-}>O_2^{2-}$

What is the oxidation number of Br in KBrO₄ ?

• + 6

• + 7

• + 5

• + 8

Which ofthe following statements is incorrect?

• Li⁺ has minimum degree of hydration.

• The oxidation state of K in KO₂ is + 1.

• Na is used to make a Na/Pb alloy.

• MgSO₄ is readily soluble in water.