Introduction to Carbon Family

Q.

In laboratory silicon can be prepared by the reaction

1. By heating carbon in electric furnace

2. By heating potassium with potassium dichromate

3. Silica with magnesium

4. None of these

Q. $C{O}_2$ is isostructural with

1. HgCl2

2. SnCl2

3. C2H2

4. NO2

Q. When a mixture of carbon monoxide and chlorine is exposed to sunlight the product formed is :

1. Phosgene

2. Thionyl chloride

3. Phosphine

4. Carbon tetrachloride

Q. The carbide which gives propyne on hydrolysis is :

1. Mg2C3

2. Fe3C

3. CaC2

4. Al4C3

Q. Thermodynamically the most stable form of carbon is

1. coal

2. graphite

3. diamond

4. fullerenes

Q. If $C{O}_2$ is passed in excess into lime water, the milkiness first formed disappears due to

1. reversal of the original reaction

2. formation of volatile calcium derivative

3. formation of water soluble calcium bicarbonate

4. the solution getting heated by exothermic reaction

Q. When steam is passed through red hot coke :

1. petrol gas is obtained

2. CO2 and H2 are obtained

3. CO and N2 are formed

4. CO and H2 are obtained

Q.

Which of the following is incorrect for group 14 elements?

1. The stability of dihalides are in the order CX2<SiX2<GeX2<SnX2<PbX2

2. The ability to form p-p multiple bonds among themselves increases down the group

3. The tendency for catenation decreases down the group

4. They all form oxides with the formula

Q. Fire extinguishers contain a bottle of $H_{2}S{O}_4$ and :

1. CaCO3

2. MgCO3

3. NaHCO3

4. any carbonate

Q.

The number and type of bonds between two carbon atoms in $Ca{C}_2$ are

1. one sigma and one pi bond

2. one sigma and two pi bonds

3. one sigma and one and a half pi bond

4. one sigma bond