# Chemistry Questions

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

Answer & Explanation Answer: D) Option 4

Explanation:

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

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Q:

The purest form of iron is

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

Answer & Explanation Answer: A) wrought iron

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:

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

Answer & Explanation Answer: B) Option 2

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:

Hydrogen bomb is based on the principle of

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

Answer & Explanation Answer: B) nuclear fusion

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:

SI unit of equivalent conductance

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

Answer & Explanation Answer: B) Siemens m2/equivalent

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 are chemical changes?

A) Cooking of Food

B) Digestion of Food

C) Freezing of water

D) Water is heated up

 A) A & B B) A, B & C C) C & D D) All the above

Answer & Explanation Answer: A) A & B

Explanation:

A) Cooking of Food  ------ Chemical Change

B) Digestion of Food ----- Chemical Change

C) Freezing of water ----- Physical Change

D) Water is heated up ---- Physical Change

because here the chemical composition of the substance changes in A & B only.

Since we know that, If the chemical composition is changing then it is a chemical change and if the chemical composition is remaining the same, then it is a physical change.

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Q:

Which pair of atoms has the highest electronegativity difference?

(Calcium's electronegativity is 1.0

Fluorine's electronegativity is 4.0

Hydrogen's electronegativity is 2.2

Sodium's electronegativity is 0.93)

 A) F-F B) Ca-F C) H-F D) Na-F

Explanation:

F-F = 4 - 4 = 0

Ca-F = 4 - 1 = 3.0

H-F = 4 - 2.2 = 1.8

Na-F = 4 - 0.93 = 3.07

Hence, the highest electronegativity difference is in Na-F.

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Q:

What is the Iupac name for the compound shown below.

 A) 1-Bromo-3-chlorocyclohexene B) 2-Bromo-6-chlorocyclohex-1-ene C) 6-Bromo-2-chlorocyclohexene D) 3-Bromo-1-chlorocyclohex-1-ene