Question # 1

In the electronic configuration of Cr one electron from 4s sub-shell is transfered to 3d sub-shell because

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The 3rd orbital is of lower energy than 4s

The 4s orbital is of equal energy to 3d orbital

The half filled d-subshell is more stable than incomplete d-sub shell

6 unpaired electrons make Cr more paramagnetic

Which of the following has highest first ionization potential?

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Carbon

Oxygen

Nitrogen

Boron

Give IUPAC name fo Acetone

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Ethanal

Propanone

Butanone

Propanal

Rectified spirit contains alcohol about

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80%

85%

90%

95%

Among the following elements which one has the highest value of first ionization potential?

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Oxygen

Argon

Barium

Cesium

The color of Cr³⁺ion is

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Violet

Blue

Pink

Green

Solvay process is used in the manufacture of

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Na₂CO₃

NaHCO₃

CaCl₂

All

The correct arrangement of increasing order of atomic radius among Na, K, Mg, Rb is

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Mg < K < Na < Rb

Mg < Na < K < Rb

Mg < Na < Rb < K

Na < K < Rb < Mg

The value of R(General Gas Constant) is

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8.3134 JK^-1mole^-1

1.987 Cal K^-1Mole^-1

Both a and b

1.987 JK^-1mole^-1

The alkynides are used for the ----------- of alkynes

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Pxperation

Purification

Seperation

All of above

In an experiment the concentration of a reactant 'A' is doubled the rate increases four times. If concentration in tripled, then rate increases nint times. Thus the rate is proportional to ______ of concentration of 'A'

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Square root

Square

Twice

Cube

Sodium can be obtained by :

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Electrolysis of acidified water.

By heating NaCl and water at 100°

Electrolysis of molten sodium chloride.

Electrolysis of aqueous sodium chloride.

A food chemist wants to create the odour of pineapples for a product. An ester with this odour has the formula C₃H₇COOC₂H_5.Which pair of reagents would produce this ester

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C₂H₅CI and C₃H₇COOH

C₂H₅OH and C₃H₇CONH₂

C₂H₅OH and C₃H₇COOH

C₃H₇OH and C₂H₅COCI

I-Chloropropane has two isomers, it is an example of

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Chain isomerism

Position isomerism

Functional group isomerism

Metamerism

Which gas is produced by treating CaC₂with water

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Methane

Ethane

Acetylene

HCI

Amiino acids are building blocks of:

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Protein

Carbohydrates

Lipids

Fats

Alcohols are derivatives of:

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Alkanes

Alkens

Alkynes

Benzene

The gasoline with high octane No. has ______

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More knocking

Less knocking

No knocking

Only knocking

The substances which are added to the soil to provide one or more nutrient elements essential for plant growth are called

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Minerals

Hormones

Fertilizers

None of these

The fiber which is made from acrylonitrile as monomer:

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PVC

Rayon Fiber

Acrylic fiber

Polyester fiber

If 18 g glucose (C₆H₁₂C₆) is present in 1000 g of an aqueous of glucose it is said to be

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1 molal

1.1 molal

0.5 molal

0.1 molal

Ethyl alcohol gives ethyl chloride with the help of

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SOCl₂

NaCl

Cl₂

KCl

CO+ is an example of

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Stable molecule

Anionic molecule ion

Cationic molecular ion

Free radical

Which of the following molecules have its central atom sp²hybridized

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CH₄

C₂H₂

C₂H₄

CCl₄

Osmotic pressure of a solution increases by

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Decreasing the temperature

Increasing the volume

Increasing the number of molecules of the solute

None of the above

Which acid is used in the manufacture of synthetic fibre?

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Formic acid

Oxalic acid

Carbonic acid

Acetic acid

Protein may have

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Primary structure

Secondary structure

Tertiary structure

All of these

Caroxyl group has functional in it.

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one

two

three

four

Which isomer of C₅H₁₁OH gives, one dehydration, the greastest number of different alkenes

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One of the following bonds is polar but compound is non-polar

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H₂O

NH₃

HCl

CO₂

The element with highest electron affinity among the halogen is

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F

Cl

Br

I

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