Question # 1

Which of the following molecules has a net dipole moments

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CO₂

CS₂

SO₂

CCI₄

Vitamin A is present in

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Liver

Milk

Green vegetables

All

The main structure features of proteins is

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An ester linkage

An ether linkage

The peptide linkage

All

Which one of the following is a product of the reaction between C₆H₅CH₂OH and CH₃COCI

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C₆H₅OCOCH₃

C₆H₅CH₂CI

C₆H₅CH₂OCOCH₃

C₆H₅CH₂COCI

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Initial concentration of reaction

Initial concentration of products

Final concentration of products

Order of the reaction

A system undergoes a change to attain the state of

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High energy

Low energy

Moderate energy

None of these

The solution left after the formation of crystals is called :

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Residue.

Filtrate.

Mother liquor.

None of these.

The cell in which a non-spontaneous redox reaction takes place as a result electricity is known as :

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Electrolytic cell.

Voltaic cell.

Daniel cell.

Dry cell.

Which gas is produced by treating CaC₂with water

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Methane

Ethane

Acetylene

HCI

Mixture of alcohol and water can be separated by

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Solvent extraction techniques

Crystallization

Precipitation and filtration

Fractional distillation

The ionization potential is lowest for the

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Halogens

Inert gases

Alkaline earth metals

Alkali metals

Benzene hexachloride is used as

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Dye

Antimaterial drug

Antibiotic

Insecticide

Which of the following is not correct about transition metals?

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Their melting and boiling points are high

Their compounds are generally coloured

They can form ionic or covalent compounds

They do not exhibit variable valency

The period table contains elements in vertical column. these vertical column are called

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Groups

Periods

Blocks

Sub group

Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively

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12 and 4

16 and 5

16 and 4

12 and 5

Which of the following compounds could be prepared by reacting bromoethane with KCN and then reducing the product

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CH₃CH₃

CH₃CH₂NH₂

CH₃CH₂CH₂NH₂

CH₃CH₂CH₃

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Low pressure

High pressure

High temperature

High concentration of SO₂

Oxidation of 2-propanol gives

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Propanone

Butanone

Pentanone

None of these

Dipole moment of CO molecule is:

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0.0

1.112 D

0.112 D

2.112 D

1-Chlorobutane on reaction with alcoholic potash gives

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But 1-ene

Butan-1-ol

But-2-ene

Butan-2-ol

Which element should have the greatest value for electronegativity when combined with hydrogen

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Na

Si

S

Cl

For effective collisions the molecules slow down before collision and their kinetic energy decreases which results in increase in their

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Activation energy

Average energy

Potential energy

Collisions frequency

The total number of transition elements is:

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10

14

40

50

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300 cm³

200 cm³

150 cm³

100 cm³

What element is not essential the growth of plants and is not required in the fertilizers

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Nitrogen

Potassium

Phosphorus

Barium

Hybridzation explain the --------- of orbitals

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Type of bonding

Shapes

Shape and type of bonding

None of above

Depletion of ozone layer is due to

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Oxides of nitrogen

Oxides of carbon

Oxides of sulphur

None of the above

What is formed when oxalic acid is dehydrated by conc. H₂SO₄?

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C + CO₂

CO

CO₂

CO + CO₂

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Shift reaction toward forward direction

Shift reaction backward

Lower the value of K_c

No change in reaction

In an exothermic reaction

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Enthalpy of reactants is lesser than that of products

Enthalpy of reactants is greater than that of products

Heat is transferred form surrounding into the system

Enthalpy of reactants and products same

The organic compound, alcohols are much closer to, in structure and hence is also called its derivative:

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Water

Oxidizes of lithium oxides

Oxidizes of magnesium

Oxidizes of aluminium

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