Question # 1

The pH range of the acid rain is:

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6.5 __ 6

Less than 5

8 __ 7.5

7 __ 6.5

In FWFP the phosphate fertilizers are produced at:

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D.I. Khan

Haripur

Nowshera

Dargai

How many kinds of space lattices are possible in a crystal?

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23

7

230

14

If a reaction involves only solids and liquids, which of the following is true?

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ΔH = ΔE

ΔΗ =ΔΕ

ΔH>ΔΕ

AH =AE +nRT

Doubling the pressure in a liquid phase reaction

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Will double the rex

Will increase the rex

Will decrease the rex

Will not alter the concentration of reactant

When water freezes at 0°C, its density decreases due to

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cubic structure of ice

empty spaces present in the structure of ice

change of bond lengths

change of bond angles

In which of the following compounds H-binding is not present?

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ethanol

ether

water

ammonia

For an ideal gas, number of mole in terms of its pressure P, temperature T and gas constant is

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PT/R

PRT

PV/RT

RT/P

Thermoplastic polymer can be softened and hardened when cool repeatredly, Which one is not a thermoplastic among he following?

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epoxy resin

PVC

Plastic toys

none of all

Ozone in stratosphere extends upto km:

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0-15 km

10-15 km

15-40 km

15-25 km

Which of the following factors does not affect the SN1 rate is

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Nucleophilicity of the attacking nucleophile

Stability of the carbonium ion

Solvent system

The nature of leaving group

Compounds having same molecular formula but different structures are said to be

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Monomers

Isomers

Metamers

Tautomers

Which of the following is a polar molecules

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Carbon dioxide

Carbon tetrachloride

Methanol

Ethane

The organic compounds which derivative of hydrocarbons due to oxygen is:

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Phenol

Alcohol

Alkyl halide

Either

Which salt is used for preserving food

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BaCl₂

CaCl₂

NaCl

Na₂SO₄

Which of the following is not the reactions of lithium

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Which one of the following step is not involved in determination of empirical formula

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Determination % of each element

Determination of gram atom of each element

Determination of isotopes of each element

Determination of atomic ratio of element

K_bfor NH₄OH is 1.81 x 10^-5, then K_avalue of its conjugate base is

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1.81 x 10⁺⁵

1.81 x 10^-9

5.5 x 10^-9

5.5 x 10^-10

Antibonding MO is formed by

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Addition of atomic orbitals

Substraction of atomic orbitals

Multiplication of atomic orbitals

None of these

Which is made by coordinate covalent bond

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H₃O⁺

H₂O

CH₄

HCl

Major component of natural gas is:

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Ethane

Ethene

Propane

Methane

A certain current liberate 0.5 g of hydrogen in 2 h. How many grams of copper can be liberated by the same time in a copper sulphate solution?

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12.7 gm

15.9 gm

31.8 gm

63.5 gm

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