1
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

A colourless solid $$(X)$$ on heating evolved $$\mathrm{CO}_2$$ and also gave a white residue, soluble in water. Residue also gave $$\mathrm{CO}_2$$ when treated with dilute acid. $$(X)$$ is

A
$$\mathrm{Na}_2 \mathrm{CO}_3$$
B
$$\mathrm{CaCO}_3$$
C
$$\mathrm{Ca}\left(\mathrm{HCO}_3\right)_2$$
D
$$\mathrm{NaHCO}_3$$
2
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

Consider the following boron halides.

1. $$\mathrm{BF}_3$$

2. $$\mathrm{BCl}_3$$

3. $$\mathrm{BBr}_3$$

4. $$\mathrm{BI}_3$$

The Lewis acid characters of these halides are in the order of

A
1 < 2 < 3 < 4
B
1 < 3 < 2 < 4
C
4 < 3 < 2 < 1
D
4 < 2 < 3 < 1
3
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

Which of the following defect lowers the density of a solid?

A
Frenkel defect
B
Schottky defect
C
Both (a) and (b)
D
Interstitial defect
4
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

Which of the following option is correct regarding $$\mathrm{OF}$$ and $$\mathrm{F}_2$$ ?

A
$$\mathrm{O F}$$ is paramagnetic while $$\mathrm{F}_2$$ is diamagnetic.
B
$$\mathrm{OF}$$ is more stable towards dissociation into atoms than $$\mathrm{F}_2$$.
C
Both (a) and (b) are correct.
D
None of the above is correct.
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