1
MCQ (Single Correct Answer)

NEET 2013

Which of the following structure is similar to graphite?
A
B4C
B
B2H6
C
BN
D
B

Explanation

Boron nitride (BN) is known as inorganic graphite. The most stable form is hexagonal one. It has layered structure similar to graphite.
2
MCQ (Single Correct Answer)

NEET 2013

The basic structural unit of silicates is
A
SiO32$$-$$
B
SiO$$_4^{2 - }$$
C
SiO$$-$$
D
SiO$$_4^{4 - }$$

Explanation

SiO$$_4^{4 - }$$ orthosilicate is basic unit of silicates.
3
MCQ (Single Correct Answer)

NEET 2013

Which of these is not a monomer for a high molecular mass silicone polymer?
A
Me3SiCl
B
PhSiCl3
C
MeSiCl3
D
Me2SiCl2

Explanation

Since Me3SiCl contains only one Cl, therefore it can’t form high molecular mass silicon polymer. It can form only dimer.
4
MCQ (Single Correct Answer)

AIPMT 2012 Mains

In which of the following arrangements the given sequence is not strictly according to the property indicated against it?
A
HF < HCl < HBr < HI : increasing acidic strength
B
H2O < H2S < H2Se < H2Te : increasing pKa values
C
NH3 < PH3 < AsH3 < SbH3 : increasing acidic character
D
CO2 < SiO2 < SnO2 < PbO2 : increasing oxidising power

Explanation

If acidic nature is high, Ka is high and pKa is low.

since pKa = – log Ka

Hence the order of pKa will be

H2O > H2S > H2Se > H2Te

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