Question # 1

Ethanol is prepared in Pakistan form fermentation of:

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Starch

Sugar

Glucose

Molasses

n + l value for 4f will

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2

5

7

9

The fiber which is made from acrylonitrile as monomer:

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PVC

Rayon Fiber

Acrylic fiber

Polyester fiber

On alkali and alkaline earth metals down the group, there is decreasing trend in

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m.p.

b.p.

Ionization potentiall

All of these

In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to

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Generate heat

Remove adsorbed oxygen from electrode surfaces

Produce High purity water

Create potential difference between two electrodes

The number of moles of CO2which contain 8.0 g of oxygen

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0.25

0.50

1.0

1.50

The phenomenon of isotropy was first discovered by

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Soddy

Rutherford

Bohr

Dalton

The main structure features of proteins is

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An ester linkage

An ether linkage

The peptide linkage

All

10% aqueous solution of NaCI has molarity

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1.7 M

2.7 M

0.17 M

3.7 M

1 mole of N₂and 2 moles of H₂are allowed to react in a 1 dm³vessel. At equilibrium 0.8 mole of NH₃is formed. The concentration of H₂in the vessel is

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0.6 mole

0.8 mole

0.2 mole

0.4 mole

During nitration of benzene, the active nitrating agent is

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NO3

NO2+

NO2-

HNO3

Which statement is true about a free radical

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An atom with a positive charge

An atom with a negative charge

An atom with a lone pair of electrons

An atom with unpaired electron

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

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Proton donar

Dehydrating agent

Catalyst

Electrophile

Alkyl halides on treatment with aqueous KOH give

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Phenol

Alcohol

Aldehyde

Ketone

The element with highest electron affinity among the halogen is

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F

Cl

Br

I

Reactions that proceed on both sides and never go to completion are called

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Irreversible reactions

Reversible reactions

Opposing reactions

Spontaneous reactions

When 6s orbital is complete then next electron goes to

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6p

6d

5d

4f

Acetylene when treated with 10% H₂SO₄in the presence of HgSO₄adds one molecule of water to form

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Aldehydes

Esters

Alcohols

Acids

Partial reduction of acetic acid happens with

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NH₃

LiAIH₄

P + HI

PCI₅

In carboxyl group the bond between C and oxygen is:

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Sigma bond

Single bond

Double Bond

Triple bond

Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:

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Millikan.

J. Perrin.

Hittrof

J.J. Thomson.

Compounds having the same molecular formula, but different functional groups show

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Metamerism

Position isomerism

Chain isomerism

Functional group isomerism

Which of the following solutions has the highest boiling point ?

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5.85% solution of sodium chloride.

18.0% solution of glucose.

6.0% solution of urea.

All have same boiling points.

Formation of a cation is:

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Exothermic process

Non-endothermic process

Endothermic process

None of above

The number of isotopes of gold is

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3

1

2

4

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

If a large number of amino acids (hundreds to thousands) are joined by peptide bonds, the resulting product is called

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Dipeptide

Tripeptide

Polypeptide

None of these

The electron in an atom

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moves randomly around the nucleus

has fixed space around the nucleus

is stationary in various energy levels

moves around its nucleus in definite energy levels

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2-bromonitrobenzene

2-nitrobromobenzene

1-bromonitrobenzene

1-nitrobromobenzene

Grignard's reagent on treatment with dry CO₂and HCI yields

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Ester

Alcohol

Carboxylic acid

Aldehyde

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