Question # 1

What is the total number of different chloroethanes, formula C₂H_6-nCl_n, where n can be any integer from 1 to 4

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4

6

7

8

Substitution of halogen in the benzene ring requires catalyst

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AlCl₃

FeCl₃

SiO₂

Organo - nickel

Which statement in not correct about alcohol?

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Ethyl alcohol is heavier than water

Ethyl alcohol ecaporates more quickly

Alcohol with less number of carbon atoms is more soluble in water than alcohol with more number of carbons atoms

Alcohol produces H₂by reaction with sodium metal

The simplest separating unit of a polymer is called:

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Monomer

Dimer

Trimmer

Macromer

When ethyl iodide and n-propyl iodide are allowed to react with sodium metal in ether, the number of alkanes that could be produced is

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Only one

Two alkanes

Three alkanes

Four alkanes

Alkenes normally have ______ geometry

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Tetrachedral

Linear

Planer

None

Which is the correct electronic configuration of Cr - 24

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1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁴, 4s²

1s², 2s², 2p⁶, 3s², 3p⁶, 3d³, 4s², 4p¹

1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁵, 4s¹

1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁵, 4p¹

Given below are some statements concerning formic acid, which of them is true?

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It is a weaker acid than acetic acid

It is a reducing agent

When its calcium salt is heated, it forms a ketone

It is an oxidizing agent

An element of the third period (Na to S) is heated in chlorine. The product is purified and then added to water. The resulting solution is found to be neutral. What is the element

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Sodium

Aluminium

Silicon

Phosphorus

Which one of the following compounds does not have the empirical formula CH₂O?

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Ethanoic acid, CH₃CO₂H

Ethanol, CH₃CH₂OH

Glucose, C₆H₁₂O₆

Methanal, HCHO

Maximum variable oxidation state is of:

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Mn⁺²

Fe⁺³

Cr⁺¹

a and b

Dehydration of ethyl alcohol yields

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Aldehyde

Ketone

Acid

Alkene

When primary amine reacts with chloroform in ethanolic KOH, then the product is

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An isocyanide

An aldehyde

A cyanide

An alcohol

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Adding H₂O and H⁺ions

Adding OH^-ions

Adding O²molecules

Adding O atoms

Covalent compounds are soluble in

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Polar solvents

Non-polar solvents

Concentrated acids

All solvents

Size of an anion is increased as compared to its atom because of the

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Addition of new shell

Repulsion of electrons in the valence shell

Decrease in nuclear charge

Increase in the unclear charge

The addition of a catalyst to a reaction changes the

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Enthalpy

Entropy

Nature of reactants

Energy of activation

Benzene does not undergo polymerization and it is also resistant to

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Reduction

Oxidation

Alkylation

Ozonolysis

Any substance under going physical or chemical change is said to be

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Surrounding

System

Losphere

Lithosphere

A compound used as eye wash:

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Borax

Boric acid

Metabolic acid

Pyroboric acid

Toluene is also called

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Hydroxyl benzene

Methyl benzene

ethyl benzene

None

The sum of mole fractions (X) of components of solution is equal to

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100

200

One

Zero

Grignad reagent is reactive due to

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The presence of halogen atom

The presence of Mg atom

The polarity of C - Mg bond

None of above

Which of the following substances is used as an antiknock compound?

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Tetraethyl lead

Lead tetrachloride

Lead acetate

Ethyle acetate

At what pH glycine shows the structure H_3N⁺-- CH₂-- COOH

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2

7

10

14

Borax is a common mineral of alkali metal sodium. Its formula is

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Na₂B₄O₇

Na₂,B₄O₇. 10H₂O

Na₂B₃O₆. 10H₂O

Na₂B₄O₇- 5H₂O

The base used in Cannizzaro's reaction is

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NaOH

KOH

CHI₃

All of these

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

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O₂

N₂

Br₂

F₂

According to MO Theory, the species O₂+ possesses

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bond order of 2.5

three unpaired

diamagnetic character

stability lower then O₂

Heaviest particle is

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Meson

Neutron

Proton

Electron

Which step is unnecessary for purification of water for drinking purposes

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Aeration

Coagulation

Treatment with chlorine

Treatment with iodine

Protein may have

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Primary structure

Secondary structure

Tertiary structure

All of these

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Shift reaction toward forward direction

Shift reaction backward

Lower the value of K_c

No change in reaction

Which one of the following gases is used for artificial ripening of fruits

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Ethane

Ethyne

Methane

Propane

Photons of yellow colour are ______ energetic than violet colour

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More

Less

Equal

None

A compound contains 75% carbon and 25% hydrogen, by mass. What is the molecular formula of the compound/

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C₃H₈

CH₄

C₂H₄

C₂H₆

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