When sodium or potassium oxide is heated in a current of $C{O}_2<mspace\; width="1em"></mspace>at<mspace\; width="1em"></mspace>360°C$, we get:

1. sodium formate

2. sodium oxalate

3. sodium acetate

4. sodium carbonate

Which can be directly brought into gaseous state from solid state?

(1) CO

(2) Solid $C{O}_2$

(3) $P{H}_3$

(4) $CO+H_2$

Which is amphoteric oxide?

1. ZnO

2. MnO^-₄

3. CO₂

4. SiO

Which is a true acid anhydride?

(1) $A{l}_2{O}_3$

(2) CO

(3) CaO

(4) $C{O}_2$

$CC{l}_4$ does not show hydrolysis but $SiC{l}_4$ is readily hydrolysed because:

(1) carbon cannot expand its octet but silicon can expand.

(2) electronegativity of carbon is higher than of silicon

(3) IP of carbon is higher than of silicon

(4) carbon forms double and triple bonds but not silicon

Which is formed when $SiC{l}_4$ vapours are passed over hot Mg?

(1) $SiC{l}_2+MgC{l}_2$

(2) $Si+MgC{l}_2$

(3) $M{g}_{2}Si+C{l}_2$

(4) $MgSiC{l}_6$

Asbestors is chemically:

1. silicate of calcium and magnesium

2. calcium alumino silicate

3. magnesium alumino silicates

4. calcium silicate + calcium aluminates

Aqueous solution of sodium silicate is:

(1) acidic

(2) alkaline

(3) neutral

(4) insoluble

Quartz is made of silicon and oxygen joined in a network arrangement that is similar to:

1. Diamond

2. Graphite

3. $O_2$

4. None of the above

The product obtained when silica reacts with hydrogen fluoride is:

1. SiF₄

2. H₂SiF₆

3. H₂SiF₄

4. H₂SiF₃