# Chemistry Questions

Q:

The purest form of iron is

 A) wrought iron B) steel C) pig iron D) nickel steel

Explanation:

Wrought Iron is the purest form of iron. It contains 0.12 to 0.25% carbon and so it is the purest form of iron.

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Q:

Hydrogen bomb is based on the principle of

 A) nuclear fission B) nuclear fusion C) natural radioactivity D) artificial radioactivity

Explanation:

Hydrogen Bomb is based on the principle of Nuclear Fusion.

• Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles.

• The difference in mass between the reactants and products is manifested as either the release or absorption of energy.

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Q:

Among the following the maximum covalent character is shown by the compound

(1)$MgCl2$

(2)$FeCl2$

(3)$SnCl2$

(4) $AlCl3$

 A) Option 1 B) Option 2 C) Option 3 D) Option 4

Explanation:

According to Fajans rule, cation with greater charge and smaller size favours covalency.

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Q:

Which of the following is a non metal that remains liquid at room temperature  ?

 A) Chlorine B) Phosphorous C) Bromine D) Helium

Explanation:

The chemical element with the atomic number 35, Bromine is a non metal that remains liquid at room temperature. Mercury also remains liquid at room temperature but it is a metal. Bromine is the third lightest halogen.

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Q:

Brass gets discoloured in air because of the presence of which of the following gases in air  ?

 A) Hydrogen sulphide B) Oxygen C) Nitrogen D) Carbon dioxide

Explanation:

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Q:

What is the structure of IF7 ?

 A) Triagonal bipyramid B) Pentagonal bipyramid C) Square pyramid D) tetrahedral

Explanation:

In IF7 out of 7 Flourine atoms 5 of them are placed on a plane in Pentagon shape .In remaining 2 flourines one is placed above the plane and other below the plane each at 90 degrees

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Q:

Boron cannot form which one of the following anions?

(1) $BO2-$

(2) $BF63-$

(3) $BH4-$

(4) $B(OH)4-$

 A) Option 1 B) Option 2 C) Option 3 D) Option 4

Explanation:

Due to absence of low lying vacant d orbital in B, $sp3d2$hybridization is not possible hence $BF63-$will not formed.

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Q:

Which one of the following is not a mixture

 A) air B) mercury C) milk D) cement