AIEEE 2004 | p-Block Elements Question 229 | Chemistry

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

a change in the partial pressure of oxygen in the air

a change in the crystalline structure of tin

an interaction with nitrogen of the air at very low temperature

an interaction with water vapor contained in the humid air

AIEEE 2003

MCQ (Single Correct Answer)

-1

Which one of the following substances has the highest proton affinity?

H₂S

NH₃

PH₃

H₂O

AIEEE 2003

MCQ (Single Correct Answer)

-1

Out of Syllabus

Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite :

is an allotropic form of diamond

has molecules of variable molecular masses like polymers

has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds

is a non-crystalline substance

AIEEE 2003

MCQ (Single Correct Answer)

-1

Out of Syllabus

What may be expected to happen when phosphine gas is mixed with chlorine gas?

PCI₃ and HCI are formed and the mixture warms up

PCI₅ and HCI are formed and the mixture cools down

PH₃.Cl₂ is formed with warming up

The mixture only cools down

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