Question # 1

Dilute hydrochloric acid solution cannot be concentrated by boiling beyond

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11%

33%

44%

22%

Each of following is true of white and red phosphours except that they

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Are both soluble in CS₂

Can be oxidized by heating in air

Consist of the same kind of atoms

Can be converted into one another

The unit rate of a reaction can be increased in general by all the factors except by

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Using a catalyst

Increasing temperature

Increasing the activation energy

Increasing the conc. of reactants

The last orbit of argon would have electrons

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8

18

2

6

Which of the following units represents largest amount of energy?

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Calorie

Joule

Erg

Electron vol.

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

Heating a mixture of sodium benzoate and soda lime gives

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Methane

Benzene

Sodium benzoate

Calcium benzoate

Which is true for an element R present in group 13 of the periodic table?

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It is a gas at room temperature

It has oxidation state of +4

It forms R₂O₃

It forms RX₂

What happens when CCl₄is treated with AgNO₃solution?

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NO₂will be evolved

A white ppt. of AgCl will form

CCl₄will dissolve in AgNO₃solution

Nothing will happen

By using the fluted filter paper rate of filtration is

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Increased

Decreased

Filtration is constant

Having no effect

Which of the following statement is correct if the intermolecular forces in liquids A, B and C are in the order A < B < C?

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B evaporates more readily than A

B evaporates less readily than C

A and B evaporates at the same rate

A evaporates more readily than C

An electrolyte

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Forms complex ions in solution

Gives ions only when electricity is passed

Possesses ions even in solid state

Gives ions only when dissolved in water

Wt. of 112 ml of oxygen at NTP on liquification would be

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0.32 g

0.64 g

0.16 g

0.96 g

Hybridization explain the ----------- of orbitals

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Type of Bonding

Shapes

Shape and Type of bonding

None of above

When KClO₃is heated, it decomposes into KCl and O_{2. If some MnO2 is added, the reaction goes much faster because}

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MnO₂decomposes to give O₂

MnO₂provide heat by reacting

Better contact is provided by MnO₂

MnO₂acts as a catalyst.

Ethyl alcohol is industrially prepare from ethylene by

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Permanganate oxidation

Catalytic reduction

Absorbing in H₂SO₄followed by hydrolysis

Fermentation

Which of the following halogens does not form its oxyacids?

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F

Cl

Br

I

Which metal is protected by a layer of its own oxide?

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Al

Ag

Au

Fe

Bond angle is minimum for

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H₂O

H₂S

H₂Se

H₂Te

DDT is formed from

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Benzene and Chlorobenzene

Chloral and Chlorobenzene

Chloral and benzene

Chlorobenzene and chlorine

Wholer prepared urea from

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Ammonia

NH₄CNO

NH₃

Uric acid

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