Question # 1

Which of the following bonds is not present in NH4CL

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lonic bond

Covalent bond

Co-ordinate covalent bond

De-localized covalent bond

Which one of the following elements is not an alkali metal?

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Na

Sr

Cs

Rb

Which of the following is addition polymerization

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PVA

Polystyrene

Both

None

The respiration process taking place in animals depends upon a difference in:

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vapour pressure

osmotic pressure

partial pressure

atmospheric pressure

The alternate name of Glucose is

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Dextrose

Grape sugar

Blood sugar

All

If v is the volume of one molecule of a gas under given conditions, then Van der Waals constant b is (N_Ais Avogadro number)

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Which of the following is the correct equation to calculate relative molecular mass of a gas

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M=mPRTV

M=mPR/VT

M=PV/mRT

M=mRT/PV

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

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0.32 g

0.64 g

0.16 g

0.96 g

Which group activates the benzene ring

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-COOH

-COR

-CHO

-OH

Glyoxal molecule has?

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two carbonyl groups

One aldehydic and one carbonyl group

Two aldehydic groups

Two carboxyl group

The boding which covalent molecules containing hydrogen and one of the small electronegative element such as O, For Mis called:

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ionic bonding

bridge bonding

H-bonding

metalic bonding

The number of bonds in nitrogen molecule is

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Oneφ and one π

Oneφ and two π

three sigma only

Two φ and one π

The characteristic reactions of alkanes are

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Addition reactions

Substitution reactions

Condensation reactions

Polymerization reactions

Which of the following sulphates is not soluble in water

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Sodium sulphate

Potassium sulphate

Zinc sulphate

Barium sulphate

Which decolourizes the colour of Br₃

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CH₄

CH_3-CH₃

CH_3-CH_3-CH₃

CH₂₌CH₂

During electrolysis, electrons are :

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Lost by anions and gained by cations

Gained by anions and lost by cations

Gained only

Lost only

Noble gases have the electronic configuration with their valance shell ns²np⁶except one

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He

Ne

Kr

Xe

At present cement plants in Pakistan are:

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Ten

Twenty Two

Four

Twenty Four

If the rate of decay of radioactive isotope decreases from 200 cpm to 25 cpm after 24 hours, what is its half life :

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8 hours

6 hours

4 hours

3 hours

E.D.T.A is

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Mono-dentate

Bi-dentate

Polydentate

Having three lone pairs of electrons

Source of organic compounds primarily is:

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Plants

Animals

Minerals

A & B

Electronic configuration of Cu⁺²is

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4S², 3d⁹

4s^-1, 3d¹⁰

4S⁰, 3d⁹

None of these

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