Hybridisation in ${\mathrm{CH}}_3,\stackrel{+}{ \mathrm{C}}{\mathrm{H}}_3 \mathrm{and} \stackrel{-}{\mathrm{C}}{\mathrm{H}}_3$ are respectively

• sp², sp², sp³

• sp², sp³, sp³

• sp³, sp³, sp²

• sp³, sp², sp³

Which of the following arrangements is possible?

• n	l	m	s
  5	2	2	$+\frac{1}{2}$

• n	l	m	s
  2	2	0	$-\frac{1}{2}$

• n	l	m	s
  3	-2	1	$+\frac{1}{2}$

• n	l	m	s
  0	0	1	$+\frac{1}{2}$

Which of the following is strongest Bronsted base?

• ClO-

• ClO₂^-

• ClO₃^-

• ClO₄^-

In which of the following $\mathrm{p\pi }-\mathrm{d\pi }$ bonding is possible?

• ${\mathrm{CO}}_3^{2-}$

• ${\mathrm{PO}}_4^{3-}$

• ${\mathrm{NO}}_3^{-}$

• ${\mathrm{NO}}_2^{-}$

5.

Which of the following is always feasible?

• $∆\mathrm{H}=\mathrm{T}∆\mathrm{S}$

• $∆\mathrm{H}(+\mathrm{ve}), \mathrm{T}∆\mathrm{S} (-\mathrm{ve}) \mathrm{and} ∆\mathrm{H} >\mathrm{T}∆\mathrm{S}$

• $∆\mathrm{H}(-\mathrm{ve}), \mathrm{T}∆\mathrm{S} (+\mathrm{ve}) \mathrm{and} ∆\mathrm{H} < \mathrm{T}∆\mathrm{S}$

• $∆\mathrm{H}(-\mathrm{ve}), \mathrm{T}∆\mathrm{S} (-\mathrm{ve}) \mathrm{and} ∆\mathrm{H} >\mathrm{T}∆\mathrm{S}.$

Given that 

$$\begin{gathered} \mathrm{C} + {\mathrm{O}}_2 \to {\mathrm{CO}}_2 ; ∆{\mathrm{H}}^{°} =-\mathrm{a} \mathrm{kJ}. \\ 2\mathrm{CO} + {\mathrm{O}}_2 \to 2{\mathrm{CO}}_2 ; ∆{\mathrm{H}}^{°} = -\mathrm{b} \mathrm{kJ}. \end{gathered}$$ 

The heat of formation of CO is 

• $\mathrm{b}-2\mathrm{a}$

• $\frac{2\mathrm{a}-\mathrm{b}}{2}$

• $\frac{\mathrm{b}-2\mathrm{a}}{2}$

• 2a-b

When the temperature of reactions will increase then the effect on pH value will

• increase

• decrease

• first increases then decreases

• remains same.

Smallest intermolecular distance is found in

• O₂

• O₂⁺

• O₂^-

• O₂^2-

The pH of aqueous solution ofammonium formate is (pK_a of HCOOH = 3.8 and pK_b of NH₃= 4.8)

• 7

• 6.0

• 6.5

• 8.9

dsp² hybridisation is found in

• [Ni(CN)₄]^2-

• [CoCl₄]^2-

• [CuCl₄]^3-

• [CuCl₄]^2-