# 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:

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:

SI unit of equivalent conductance

 A) ohm/cm B) Siemens m2/equivalent C) Siemens/equivalent D) mho/cm

Explanation:

Equivalent conductance is defined as the conductance of an electrolyte solution containing one gram equivalent of the electrolyte. It is equal to the product of specific conductance (k) of the solution and the volume (V) of the solution that contains one gram equivalent of the electrolyte.

$λ$ = k x V

Unit of spceific conductance k is Siemens / m.

Volume of the solution V is $m3$

Now, required equivalent conductance unit is .

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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:

Which one of the following is not a mixture

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

Explanation:

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Q:

Among the given nutrients, milk is a poor source of

 A) Calcium B) Protein C) Vitamin C D) Carbohydrates