Question 1: Palette 1/6

AIIMS 2019 MCQ

Which of the following, number of lone pair at central atom zero $\mathrm{XeO}_3, \mathrm{XeO}_2 \mathrm{~F}_2, \mathrm{XeO}_4, \mathrm{XeO}_3 \mathrm{~F}_2, \mathrm{XeF}_6$ ?

A

2

B

3

C

4

D

Zero

Question 2: Palette 2/6

AIIMS 2019 MCQ

Which is least soluble?

A

Na$_2$S

B

MgS

C

MgCl$_2$

D

NaCl

Question 3: Palette 3/6

AIIMS 2019 MCQ

Assertion : $\mathrm{BO}_3^{-3}$ and $\mathrm{SO}_3^{-2}$ are not isostructural.

Reason : In $\mathrm{SO}_3^{2-}$ sulphur has one lone pair of electron.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true, but reason is not the correct explanation of assertion.

C

If assertion is true, but reason is false.

D

If both assertion and reason are false.

Question 4: Palette 4/6

AIIMS 2018 MCQ

X and Y respectively are

A

B

C

D

Question 5: Palette 5/6

AIIMS 2018 MCQ

The structure of $\mathrm{IF}_7,$ is

A

square pyramidal

B

trigonal bipyramidal

C

octahedral

D

pentagonal bipyramidal

Question 6: Palette 6/6

AIIMS 2018 MCQ

Assertion (A) Among the two $\mathrm{O}-\mathrm{H}$ bonds in $\mathrm{H}_2 \mathrm{O}$ molecule, the energy required to break the first $\mathrm{O}-\mathrm{H}$ bond and the other $\mathrm{O}-\mathrm{H}$ bond is same.

Reason (R) This is because the electronic environment around oxygen is the same even after breakage of one $\mathrm{O}-\mathrm{H}$ bond.

A

Both (A) and (R) are true and (R) is the correct explanation of (A).

B

Both (A) and (R) are true, but (R) is not the correct explanation of (A).

C

(A) is true and (R) is false.

D

Both (A) and (R) are false.