The correct statement with regard to ${\mathrm{H}}_2^{+} \mathrm{and} {\mathrm{H}}_2^{-}$ is

• both ${\mathrm{H}}_2^{+} \mathrm{and} {\mathrm{H}}_2^{-}$ are equally stable

• both ${\mathrm{H}}_2^{+} \mathrm{and} {\mathrm{H}}_2^{-}$ do not exist

• H${}_2^{-}$ is more stable than H${}_2^{+}$

• H${}_2^{+}$ is more stable than H${}_2^{-}$

Arrange the following in the increasing order of their bond order

O₂, O${}_2^{+} , {\mathrm{O}}_2^{-} \mathrm{and} {\mathrm{O}}_2^{2-}$

• ${\mathrm{O}}_2^{2-}, {\mathrm{O}}_2^{-}, {\mathrm{O}}_2, {\mathrm{O}}_2^{+}$

• ${\mathrm{O}}_2^{2-}, {\mathrm{O}}_2^{-}, {\mathrm{O}}_2^{+}, {\mathrm{O}}_2$

• ${\mathrm{O}}_2^{+}, {\mathrm{O}}_2, {\mathrm{O}}_2^{-}, {\mathrm{O}}_2^{2-}$

• ${\mathrm{O}}_2, {\mathrm{O}}_2^{+}, {\mathrm{O}}_2^{-}, {\mathrm{O}}_2^{2-}$

30 cc of $\frac{\mathrm{M}}{3}$, 20 cc of $\frac{\mathrm{M}}{2}$ HNO₃ and 40 cc of $\frac{\mathrm{M}}{4}$ NaOH solutions are mixed and the volume was made up to 1 dm³. The pH of the resulting solution is

• 8

• 2

• 1

• 3

10^-6 M NaOH is diluted 100 times. The pH of the diluted base is

• between 7 and 8

• between 5 and 6

• between 6 and 7

• between 10 and 11

For the reaction H₂O (l) $\rightleftharpoons$ H₂O (g) at 373 K and 1 atm pressure

• $∆$H = 0

• $∆$E = 0

• $∆\mathrm{H} = \mathrm{T}∆\mathrm{S}$

• $∆\mathrm{H} = ∆\mathrm{E}$

The correct set of four quantum numbers for outermost electron of potassium (Z = 19) is

• 4, 1, 0, $\frac{1}{2}$

• 3, 1, 0, $\frac{1}{2}$

• 4, 0, 0, $\frac{1}{2}$

• 3, 0, 0, $\frac{1}{2}$

A body of mass x kg is moving with a velocity of 100 ms^-1. Its de-Broglie wavelength is 6.62 × 10^-35 m. Hence, x is (h = 6.62 × 10^-34 Js)

• 0.1 kg

• 0.25 kg

• 0.15 kg

• 0.2 kg

The correct order of ionisation energy of C, N, O, F is

• F < O < N < C

• F < N < C < O

• C < N < O < F

• C < O < N < F

The oxide of an element whose electronic configuration is 1s², 2s², 2p⁶, 3s¹ is

• neutral

• amphoteric

• basic

• acidic

Among the following, the compound that contains ionic, covalent and co-ordinate linkage is

• NH₃

• NH₄Cl

• NaCl

• CaO