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

An sp³-hybrid orbital contains

• $\frac{1}{4} \mathrm{s}- \mathrm{character}$

• $\frac{1}{2} \mathrm{s}- \mathrm{character}$

• $\frac{2}{3} \mathrm{s}-\mathrm{character}$

• $\frac{3}{4} \mathrm{s}-\mathrm{character}$

Hybridisation states of C in CH${}_3^{+}$ and C${\mathrm{H}}_3^{-}$ are

• sp², sp³

• sp³, sp²

• sp, sp²

• sp², sp

Which one of the following complexes is outer orbital complex?

• [Co(NH₃)₆]³⁺

• [Mn(CN)₆]⁴⁺

• [Fe(CN)₆]^4-

• [Ni(NH₃)₆]²⁺

A solution made by dissolving 40 g NaOH in 1000 g of H₂O is

• 1 molar

• 1 normal

• 1 molal

• None of these

0.1 mol HCl is equal to

• 3.65 g

• 36.5 g

• 18 g

• 1.8 g

Which of the following has the maximum number of unpaired electrons?

• V³⁺

• Fe²⁺

• Mn²⁺

• Cu⁺

The geometry of XeF₆ is

• planar hexagon

• regular octahedron

• distorted octahedron

• square bipyramid

9.

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

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

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

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

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

For the reaction,

H₂O(l) $\rightleftharpoons$ H₂O(g)

at 373 K and 1 atm pressure

• $∆$H = 0

• $∆$E = 0

• $∆$H = T$∆\mathrm{S}$

• $∆$H = $∆$E