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1

AIPMT 2015

MCQ (Single Correct Answer)
Which of the statements given below is incorrect?
A
O3 molecule is bent.
B
ONF is isoelectronic with O2N
C
OF2 is an oxides of fluorine.
D
Cl2O7 is an anhydride of perchloric acid.

Explanation

OF2 (oxygen difluoride) is a fluoride of oxygen because fluorine is more electronegative than oxygen.
2

AIPMT 2015 Cancelled Paper

MCQ (Single Correct Answer)
Nitrogen dioxide and sulphur dioxide have some properties in common . Which property is shown by one of these compounds , but not by the other?
A
Is soluble in water.
B
Is used as a food preservative.
C
Forms 'acid-rain'.
D
Is a reducing agent.

Explanation

SO2 is widely used in food and drinks industries for its property as a preservative and antioxidant while NO2 is not used as food preservative.
3

AIPMT 2015

MCQ (Single Correct Answer)
The formation of the oxide ion, O2$$-$$(g) from oxygen atom requires first an exthermic and then an endothermic step as shown below:
O(g) + e$$-$$ $$ \to $$ O$$-$$(g);  $$\Delta $$fHo = $$-$$141 kJ mol$$-$$1

O$$-$$(g) + e$$-$$ $$ \to $$ O2$$-$$(g);  $$\Delta $$fHo = +780 kJ mol$$-$$1

Thus, process of formation of O2$$-$$ is isoelectronic with neon. It is due to the fact that,
A
O$$-$$ ion has comparatively smaller size than oxygen atom
B
oxygen is more electronegative
C
addition of electron in oxygen results in larger size of the ion
D
electron repulsion outweighs the stability gained by achieving noble gas configuration.

Explanation

The process of formation of O2– in gas phase is unfavourable even though O2– is isoelectronic with neon because electron repulsion outweigh the stability gained by achieving noble gas configuration.
4

AIPMT 2015

MCQ (Single Correct Answer)
Strong reducing behavior of H3PO2 is due to
A
high electron gain enthalpy of phosphorus
B
high oxidation state of phosphorus
C
presence of two $$-$$OH groups and one P$$-$$H bond
D
presence of one $$-$$OH group and two P$$-$$H bonds.

Explanation

All oxyacids of phosphorus which have P—H bonds act as strong reducing agents. H3PO2 has two P—H bonds hence, it acts as a strong reducing agent.

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