Question # 1

The order of reactivity of halogens in aliphatic substitution reactions is

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Br2 > C12 > F2

Cl2 > Br2 > F2

Cl2 C12 > Br2

F2 > Br2 > C12

The density of nitrogen gas prepared from air is slightly greater than that of nitrogen prepare by a chemical reaction form a compound of nitrogen due to the presence of the following in aerial nitrogen.

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Argon

CO₂

Some nitrogen molecules analogous to O2

Greater amount of nitrogen molecules derived from N¹⁵isotope.

The principal constituent of pyrex glass

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Zn

B

Pb

Cl

Which one is the property of an ideal solvent?

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Should be expensive

It should react chemically with the solute

Impurities should crystallize along with the solute

Should be safe to use

The chemical composition of white lead is

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Na₂CO₃

Pb₃O₄

Pb(OH)₂.2PbCO₃

PbO

Sodium thisoulphate is used in photography because of its

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Oxidizing behaviour

Reducing behaviour

Complexing behaviour

Photochemical behavior

Sea weeds are important source of

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Iron

Chlorine

Iodine

Bromine

A solution of sodium sulphate was electrolysed using some inert electrodes. The products at the electrodes are

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O_2,H₂

O_2,Na

O_2,SO₂

O_2,S_2O^2-₈

Phosphide ion has the electronic structure similar to that of

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Nitride ion

Fluoride ion

Sodium ion

Chloride ion

The rotation of two carbon atoms joined by double bond would happened only if

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P_ibond is broken

Sigma bond is broken

Both bonds are broken

None of above

Helium-oxygen mixture is used by deep sea divers in preference to nitrogen-oxygen mixture because

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Helium is much less soluble in blood than nitrogen

Helium is much less soluble in blood than helium

Under the sea nitrogen and oxygen react to give poisonous nitric oxide

Nitrogen is highly soluble in water.

Which of the following is an example of body centred cube?

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Magnesium

Zinc

Copper

Sodium

The osmotic pressure of solution increases if

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Temperature is decreased

Solution constant is increased

Number of solute molecules are increased

Volume is increased

Sulphonation of benzoic acid produces mainly

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o-Sulphobenzoic acid

m-Sulphobenzoic acid

p-Sulphobenzoic acid

o- and p-Sulphobenzoic acid

Evaporation of water is

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An exothermic change

an endothermic change

A process where no heat changes occur

A process accompanied by chemical reaction.

Which of the following belongs to the halogen family?

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Francium

Polonium

Radium

Astatine

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