Match the following:

Oxide	Nature
(a) CO	(i)  Basic
(b) BaO	(ii) Neutral
(c) Al2O3	(iii) Acidic
(d) Cl2O7	(iv) Amphoteric

Which of the following is the correct option? 

	a	b	c	d
1.	(ii)	(i)	(iv)	(iii)
2.	(iii)	(iv)	(i)	(ii)
3.	(iv)	(iii)	(ii)	(i)
4.	(i)	(ii)	(iii)	(iv)

Xe F${}_2$ is isostructural with : 

1. ${\mathrm{SbCl}}_3$

2. ${\mathrm{BCl}}_3$

3. ${\mathrm{TeF}}_2$

4. ${\mathrm{ICl}}_2^{-}$

The number of sigma ($\mathrm{\sigma }$) and pi ($\mathrm{\pi }$) bonds in pent-2-en-4-yne is:

1.  13 $\mathrm{\sigma }$ bonds and no $\mathrm{\pi }$ bond.

2.  10 $\mathrm{\sigma }$ bonds and 3 $\mathrm{\pi }$ bonds.

3.  8 $\mathrm{\sigma }$ bonds and 5 $\mathrm{\pi }$ bonds.

4.  11 $\mathrm{\sigma }$ bonds and 2 $\mathrm{\pi }$ bonds.

A diatomic molecule AB has a dipole moment of 0.816 debye. If its bond length is 100 pm. then what percentage of an electronic charge will exist on each atom?

1. 83%

2. 37%

3. 10%

4. 17%

The correct order of increasing dipole moment is : 

1. ${\mathrm{CF}}_4$ < ${\mathrm{NH}}_3$ < ${\mathrm{NF}}_3$ < ${\mathrm{H}}_2\mathrm{O}$

2. ${\mathrm{CF}}_4$ < ${\mathrm{NH}}_3$ < ${\mathrm{H}}_2\mathrm{O}$ < ${\mathrm{NF}}_3$

3. ${\mathrm{CF}}_4$< ${\mathrm{NF}}_3$ < ${\mathrm{H}}_2\mathrm{O}$ < ${\mathrm{NH}}_3$

4. ${\mathrm{CF}}_4$< ${\mathrm{NF}}_3$< ${\mathrm{NH}}_3$ < ${\mathrm{H}}_2\mathrm{O}$ 

The electronic configurations of the elements A, B, and C are given below.

$\mathrm{A} = 1{\mathrm{s}}^2 2{\mathrm{s}}^2 2{\mathrm{p}}^6$
$\mathrm{B} = 1{\mathrm{s}}^2 2{\mathrm{s}}^2 2{\mathrm{p}}^6 3{\mathrm{s}}^2 3{\mathrm{p}}^3$
$\mathrm{C} = 1{\mathrm{s}}^2 2{\mathrm{s}}^2 2{\mathrm{p}}^6 3{\mathrm{s}}^2 3{\mathrm{p}}^5$

The stable form of A may be represented by the formula:

Which of the following molecules have unequal bonds?

1. $Cl{F}_3$

2. $B{F}_3$

3. $Al{F}_3$

4. $N{F}_3$

Decreasing order of stability of ${\mathrm{O}}_2,{\mathrm{O}}_2^{-},{\mathrm{O}}_2^{+} \mathrm{and} {\mathrm{O}}_2^{2-}$is:

1. $O_2^{+}>O_2>O_2^{-}>O_2^{2-}$

2. $O_2^{2-}>O_2^{-}>O_2>O_2^{+}$

3. $O_2>O_2^{+}>O_2^{2-}>O_2^{-}$

4. $O_2^{-}>O_2^{2-}>O_2^{+}>O_2$

Compound in which central atom assumes sp³d hybridisation is

1. SO₃

2. PCl₅

3. SO₂

4. PCl₃

Mg₂C₃ reacts with water forming propyne ${\mathrm{C}}_3^{4-}$ . The number of sigma and pie bonds in \(C_{3}^{4-}\)is-  

1. Two sigma and two pi bonds.             

2. Three sigma and one pi bonds.           

3. Two sigma and one pi bonds.          

4. Two sigma and three pi bonds.