AIEEE 2004 | p-Block Elements Question 239 | Chemistry

Aluminium chloride exists as dimer, Al₂Cl₆ in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives :

Al3⁺ + 3Cl^-

Al₂O₃ + 6HCl

[Al(OH)₆]^3-

[Al(H₂O)₆]³⁺ + 3Cl^-

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

Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that :

oxygen in air reacts with the emitted HCI gas to form a cloud of chlorine gas

strong affinity of HCI gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke

due to strong affinity for water, concentrated hydrochloric acid pulls moisture of air towards it self. This moisture forms droplets of water and hence the cloud.

concentrated hydrochloric acid emits strongly smelling HCI gas all the time.

AIEEE 2003

MCQ (Single Correct Answer)

-1

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

H₂S

NH₃

PH₃

H₂O

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