Question # 1

The energy of the first electron is helium will be

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-13.6 eV

-54.4 eV

-5.44 eV

zero

Closed chain compound can be classified into

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Homocyclic

Hetrocyclic

Aliphatic

Both a and b

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There is no change in temperature

No change in volume

Heat is absorbed

Heat is released

A complete chemical Characterization of a compound must include:

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Qualitative analysis

Chemical analysis

Quantitative analysis

None of above

Rusting can be avoided by :

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Making alloys

Tin or Zinc plating

Use of enamel

All of these

K_bvalue of NH₄OH is 1.81 x 10^-5and its conjugate acid has K_a= 5.7 x 10^-10pKb of the base is 4.74, pKa of its conjugate acid is

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-4.74

4.74

10

9.26

Which carbonate of alkali metals is insoluble in water

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Na₂CO₃

K₂CO₃

Li₂CO₃

Cs₂CO₃

Octane number can be changed by

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Isomerisation

Alkylation

Cyclisation

All of these

Pb has inert pair of electrons:

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One

Two

Three

Four

Group l-A elements react with water fastly than the reaction of group ll-A elements because

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l_Aelements are more soft then ll_A

l_Aelements are non-metals

l_Aelements have 1 electron in their outermost s-orbital and are strongly electropositive

l_Aelements make ionic bond

Kolb's method is not useful for the production of

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Methane

Ethane

Propane

Butane

In the manufacture of NH₃by Haber's process catalyst used is iron its catalytic efficiency is poisoned by

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Presence of Al₂O₃

Presence of Cr₂O₃

MnO₂

CO present with H₂gas

Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is

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dxy

dxz

dz²

dx²- y²

Solubility cure of Na₂SO₄10H₂shows

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Constant increase of solubility

Constant decreases of solubility

Discontinuously solubility wit temperature

None of above

The fibre which contains polymers of vinylidine chloride as fibre forming substance is known as

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Saran fibre

Nylon

Polyester

Acetate fibre

Which of the following enzymes brings about the hydrolysis of fats?

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Urease

Maltase

Zymase

Lypase

Carbon monoxide is pollutant as it

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Inactivates nerves

Inhibits glycolysis

Combines with oxygen

Combines with hemoglobin

Anode is the surface on which probability of finding electron is:

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50%

Less than 10%.

More than 95%.

Zero.

A polymer may be

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Linear

Branched

Cross linked

All of these

In Millikan method for determination of charge on electron the air in the chamber is ionized by

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Protons

Electric field

X-rays

a - particles

Which of the following molecules has unpaired electrons in anti-bonding molecular orbitals?

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O₂

N₂

Br₂

F₂

The value of SHE is cathode and anode is always taken to be

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One

Zero

Different

Same

The isomers due to the unequal distribution of carbon atoms on either side of the functional group belonging to the same homologous series are called

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Functional isomers

Position isomers

Chain isomers

Metamers

Tollen's reagent is

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Ammonical cuprous chloride

Ammonical cuprous oxide

Ammonical silver bromide

Ammonical silver nitrate

Which of the followings is not a nulceophile

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OH^-

NH₃

C₂H₅O^-

Br₂

A solution sucrose is 34.2%. The volume of solution containing one mole of solute :

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342cm³

1000cm³

500cm³

242cm³

Which is not an enzyme

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Transverses

Lipase

Lyase

None of these

When propanamide reacts with Br₂and NaOH then which of the following compounds is formed?

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Ethyl alcohol

Propyl alcohol

Propyl amine

Ethylamine

The proteins which are derived by conjugated proteins are called as

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Simple protein

Complex protein

Derived protein

None

The addition of HBr is easiest with

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CH2 = CHCl

CICH = CHCl

CH3 - CH = CH2

(CH3)2 C = CH2

A cell in which spontaneous redox reaction generates an electric current is called

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Electrolytic cell

Electrochemical cell

Voltaic or Galvanic cell

Biological cell

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