Question # 1

^{Reaction of ethyl bromide with ammonia}

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Completes in a single step

Completes in two steps

Continues till N is left with no lone pair

is reversible

pH value of pepsin is:

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3

2

4

1.4

Which compound is obtained hy the elimination reaction on bromoethane?

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Butene

Ethene

Propene

Propane

The destructive distillation of coal gives three products. which of following is not the product of destructive distillation of coal?

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Coal tar

CO₂

Coal gas

Coke

The pi-electrons in the styrene are

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13

10

8

6

The mechanism of polymerization involves free addition Polymerization or condensation polymerization, Choose the correct statement:

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Polyester is an addition polymer

polythene is an addition polymer

polyviny chloride (PVC) is a condensation polymer

Polystyrene

In most of the cases the molecular crystals are

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very soft

soft

extremely hard

sufficiently hard

Potassium fertilizers are especially useful for:

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Tobacco

Potato

Coffee

All of these

The number paper industries in Pakistan are:

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30

25

35

20

In crystal of sodium chloride, a Cl-1 ion present at the corner of cube is shared between how many cubes?

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8

4

6

10

Which group activates the benzene ring

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-COOH

-COR

-CHO

-OH

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-778.9 KJ

788.0 KJ

-1.9 KJ

+1.9 KJ

Titanium is used as a catalyst in

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Hydrogenation

Dehydrogenation

Polymerization of P.E.

Oxidation of ammonia

The force which holds the atoms together to form a compound is called

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A chemical bond

Van der waal's force

Dispersion force

London force

Which one gives acidic reactions?

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CH₃----C≡C-------CH₃

CH₃-----CH₂-----HC=CH----CH₂

CH₃----CH=CH₂

CH₃-----C≡CH

Which of the following pair of atomic numbers represents s-block elements?

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7, 15

6, 12

9, 17

3, 20

A reaction in which an atom or a group of atoms replaces an atom or a group of atoms in the molecule of a substance is known as

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Addition reaction

Condensation reaction

Elimination reaction

Substitution reaction

Phosphine is not obtained by the reaction when

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White P is heated with NaOH

Red P is heated with NaOH

Ca₂P₂reacts with water

PH₄l is boiled with water

A compound possessingα-hydrogen atom, in the presence of dilute alkali formsβ-hydroxy aldehyde. This product on heating with dilute acid forms an unsaturated crotonaldehyde. The compound is

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CH₃CHO

CH₃CH₂CHO

CH₂= CH - CHO

HC = C - CHO

Which of the following is a strong electrolyte?

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Ca(NO₃)₂

HCN

CH₃COOH

NH₄OH

Solution which distill without change in composition or temperature are called

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Amorphous

Azeotropic mixture

Ideal

Super saturated

A solution consisting of 92 grams ethyl alcohol (C₂H₅OH) 96 grams methyl alcohol (CH₃OH) 90 grams water the mole fraction and mole percent of methyl alcohol is

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0.3. 30%

0.2, 30%

0.5, 30%

0.2, 20%

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