Question # 1

The main pollutant of leather tanneries in the waste water is due to:

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Lead

Copper

Chromium (VI)

Chromium (III)

Group of element belongs to IIB group

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Zn. Cd. Hg

Cu. Ag. Au

Sc. Y. La

Ni. Pd. Pt

Correct order for the reactivity ofalkyl halide in S, reactions

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R-I>R-F>R-CI

R-F>R-CI>R-I

R-I>R-CI>R-F

R-CI>R-I>R-F

All 3d series elements show an oxidation state of oxidation state

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+1

+2

+3

Zero

The enthalpy change AH of a process is given by the relation

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ΔΗ =ΔΕ + P∆V

ΔH=ΔE +W

ΔH =ΔΕ-ΔnRT

ΔΕ =ΔΗ + P∆V

Plastics are a pollution problem because may plastics:

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burn to produce toxic fumes

decompose to produce tocxic products

are made from petroleum

are very inflammable

The weight of 11.2 liters of CO₂ at S.T.P would be

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88 g

44 g

32 g

22 g

Solids in which atoms, ions or molecules are not regularly arranged are

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crystalline solid

amorphous solids

liquid crystals

low melting points

Which one of the following doesn't exhibit allotropy?

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Bi

As

N

P

Prosthetic groups are

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helical structures in protein

sulphur containing parts of protein

non-protein parts in compound proteins

sites for hydrogen bonding

Proxy acetyl nitrat5e (PAN) is an irritant to human beings and it affects:

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nose

stomach

eyes

ears

Which of the following molecules have sp³hybridized carbon

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CH₄

C₂H₄

C₂H₂

CO₂

Which of the following transition metal ions will have definite value of magnetic moment?

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Se³⁺

Ti³⁺

Cu⁺

Zn²⁺

Coordination number of Pt in [PtCI(NO₂) (NH₃)₄]²⁺is

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2-

4

1

6

Which nitrogen fertilizer is favoured in tropical regions because of its-hygroscopic nature

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Ammonium sulphate

Ammonium nitrate

Ammonium chloride

Ammonium phosphate

To purify water which has mud dissolved in it, A substance which coagulates the suspended particles is used. The coagulant may be

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Ag⁺

Cu²⁺

Al³⁺

Si⁴⁺

At 25°C, the highest osmotic pressure is exhibited by 0.1 M solution of

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CaCl₂

KCl

Glucose

Urea

At present cement plants in Pakistan are:

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Ten

Twenty Two

Four

Twenty Four

Which of the following discoveries resulted in a version of the Mendeleefs

periodic law

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The nucleus of atom by Rutherford

The elements polonium and radium by the Curies

Atomic numbers by Moseley

x-rays by Roentgen

Three sp²hybrid are co-planar at an angle of

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104.5°

109.5°

107°

120°

Which alcohol may be oxidised to a product which react with 2,4-dinitorphenylhydrazine reagent but not with Fehling's reagent

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Butan-1-ol

Butan-2-ol

2-methylpropan-1-ol

2-methylpropan-2-ol

Which is not state function

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Temperature

Enthaply

Entropy

Internal energy

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