Question # 1

The substance used as a smoke screen in warfare is

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SiCI₄

PH₃

PCI₅

Acetylene

Which of the following is acidic?

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SO₃

N₂O

BeO

HgO

The most reactive compound for electrophilic nitration will be

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Benzyl chloride

Benzoic acid

Nitrobenzene

Chlorobenzene

Sodium thiosulfate is used in photography because of its

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Oxidizing behaviour

Reducing behaviour

Complexing behaviour

Photochemical behaviour

Which of the following mineral does not contain AI?

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Cryolite

Mica

Feldspar

Fluorspar

Fertilizer are made by

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Nature only

Artificial methods only

Both artificial and natural methods

None of the above

Which quantum number is sufficient to describe the electron is hydrogen atom?

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/

n

m

s

Oleum is

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Castor oil

Oil of vitriol

Fuming of H₂SO₄

None of them

Benzene + Ozone → Y. in this sequence Y is

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Benzene monoozonide

Benzene diozonide

Benzene triozonide

Succinic acid

Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBH₄ or LiAIH₄?

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1-Propanol

2-Propanol

2-Methyl-2-propanol

Ethanol

Which of the following pairs are chemically dissimilar?

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Na and K

Ba and Sr

Zr and Hf

Ca and Zn

Acid rains are produced by

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Excess NO₂ and SO₂from burning fossil fuels

Excess production of NH₃ by industry and coal gas

Excess release of carbon monoxide by incomplete combustion

Excess formation of CO₂ by combustion and animal respiration

When electrons revolve in stationary orbits,

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There is no change in energy level

They vecome stationary

They are gaining kinetic energy

There is increase in energy

Which of the following as a molecular diseaes?

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Allergy

Cancer

German measles

Sickle cell anemia

In cold countries ethylene glycol is added to water in radiators of cars during winter. It results in

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Lowering in b.pt.

Reducing viscity

Reducing specific heat

Lowering in freezing pt.

A current of 9.65 ampere flowing ofr 10 minutes deposits 3.0 g of the metal which is monovalent. The atomic mass of the metal is

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10

50

30

96.5

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

In N.W.F.P the phosphate fertilizers are produced at

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D.I.Khan

Haripur

Nowshera

Dargai

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.

Wholer prepared urea from

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Ammonia

NH₄CNO

NH₃

Uric acid

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

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Type of Bonding

Shapes

Shape and Type of bonding

None of above

According to MO theory, the species O⁺₂

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Bond order of 2.5

Three unpaired electrons

Diamagnetic character

Stability lower then O₂

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