Physical Properties of Carbon Family

Q. Which of the following is/are not correctly matched?
(i) $Ge{O}_2-$ acidic (ii) $Pb{O}_2-$ Amphoteric
(iii) $CO$ - Neutral (iv) $Si{O}_2-$ Amphoteric

1. (iii) only
2. (iv) only
3. (i) and (iv)
4. (ii) only

Q.

Which of the following will have highest melting point?

1. B

2. Al

3. C

4. Ge

Q. Which of the following has the smallest atomic radii?

1. B

2. C

3. Al

4. Si

Q. Which of the following is most electronegative?

1. C

2. B

3. Ge

4. Al

Q. On doping Ge metal with a little of In, one gets:

1. p-type semiconductor
2. n-type semiconductor
3. insulator
4. rectifier

Q. The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniform. White metallic tin buttons got converted to grey powder. This transformation is related to:

1. a change in crystalline structure of tin
2. a change in the partial pressure of $O_2$ in air
3. an interaction with $N_2$ of air at low temperature
4. an interaction with water vapour contained in humid air

Q.

Among group 14 elements, the one having the lowest melting point is:

1. C

2. Si

3. Sn

4. Pb

Q. The stability of hydrides of the carbon family is in the order:

1. $C{H}_4>Si{H}_4>Ge{H}_4>Sn{H}_4>Pb{H}_4$
2. $C{H}_4<Si{H}_4<Ge{H}_4<Sn{H}_4<Pb{H}_4$
3. $C{H}_4>Sn{H}_4>Ge{H}_4>Si{H}_4>Pb{H}_4$
4. None of these

Q. Which of the following is an incorrect statement?

1. $SiC{l}_4$ is easily hydrolysed
2. $Ge{X}_4$ $(X=F,Cl,Br,I)$ is more stable than $Ge{X}_2$
3. $Sn{F}_4$ is ionic in nature
4. $Pb{F}_4$ is covalent in nature

Q. Choose the correct statement(s):
1. Carbon has unique ability to form pπ−pπ multiple bonds with itself .
2. Pb, Sn donot form pπ−pπ multiple bonds.
3. Pb, Sn form pπ−pπ multiple bonds.
4. Carbon can accomodate more than 4 electron.

1. 1
2. 2
3. 3
4. 4