Question # 1

Organic compounds containing halogen atom are called:

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R---OH

R----X

R----NH₂

R----COH

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0.12

0.50

0.25

4.00

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300 cm³

200 cm³

150 cm³

100 cm³

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

Which of the following metal requires radiation of highest frequency to cause emission of electrons?

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Na

Mg

K

Ca

Substances that render enzymes catalytically inactive are called

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Conenzymes

Substrates

Inhibitors

Apoezymes

Which of the following statements is no correct regarding bonding molecular orbitals?

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Bonding molecular orbitals possess ls energy than atomic orbitals from which they are formed.

Bonding molecular orbitals have low electron density between the two nuclei.

Every electron in bonding molecular orbitals contributes to the attraction b.w atoms.

Bonding molecular orbitals are formed when the electron waves undergo constructive interference.

If four moles of sulpur dioxide are oxidised to sulphur trioxide, how many moles of oxygen molecules are required

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0.5

1.0

1.5

2.0

Which of the followings is not a nulceophile

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OH^-

NH₃

C₂H₅O^-

Br₂

Which is not interstitial hydride

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LaH

VH

TaH

None

Identify the compound which has a bond angle of 109.5°

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Ethyne

Ethere

Methane

Benzene

Which of the following cannot be produced by acidic dehydration of alcohols?

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Ethers

Aldehyde

Alkyl Hydrogen sulphate

Alkene

Which of the statements given below concerning properties of solution, describe a colligative effect?

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Boiling point of pure water decreases by the addition of ethanol

Vapour pressure of pure water decreases by the addition of nitric acid

Vapour pressure of pure benzene decreases by the addition of naphthalene

Boiling point of pure benzene increases by the addition of toluene

Which one of the following is not a nuclelphile

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H₂O

H₂S

BF₃

NH₃

The amount of heat evolved or absorbed by keeping reactants and products at one atmospheric pressure at room temperature is called

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Heat of formation

Standard heat of formation

Standard enthaply change

None

With increasing principle quantum number, the energy difference between adjacent energy levels in H atom

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Decreases

Increases

Remains constant

Decreases for low value of Z and increase for higher value of Z

Which is the polymer that has amide linkage in its structure

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PVC

Poly ethene

Polyester

Nylon

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Decrease in temperature favour more dissolution of the salt

Increase in temperature favour more dissolution of the salt

Lowering pressure favour more dissolution of the salt

Increasing pressure favour more dissolution of the salt

Which of the following is not true for metalloids

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They are borderline elements that exhibit both metallic and non-metallic properties to some extent

They usually act as electron donors with non-metals and as electron acceptors with metals

Some of these elements are boron, silicon and germanium

They are good conductors of heat and electricity

Action of Zn with alkyl halides in the presence of an inert solvent forms higher alkanes. This reaction is known as

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Wurtz reaction

Frankland's reaction

Cannizaro reaction

Kalobe's reaction

Organic compounds are soluble in all except

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Benzene

Petroleum

Ether

Water

Which of the following is not a colligative property?

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Depression in freezing point

Elevation of boiling point

Osmotic pressure

Modification of refractive index

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

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One

Zero

Different

Same

Given date

(i) heat of neutralization of HCl and NaOH is -57.3 KJ mole^-1

(ii) heat of neutralization of CH₃COOH with NaOH is 55.2 KJ mole^-1

The enthalpy of ionization of CH₃COOH is a determined according to Hess's law by

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Adding i and ii

Dividing i by ii

Subtracting i from ii

Subtracting ii from i

Carboxylic acids are reduced to in presence of NaAIH₄

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Esters

Acetyl chloride

alcohol

Aldehydes

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

Which of the following compounds will not give iodoform test on treatment with I₂/ NaOH?

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Acetaldehyde

Acetone

Butane

3-pentanone

The mass of sulphur which combines with 24 grams oxygen to form SO₂

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32 gram

24 gram

8 gram

12 gram

Which one of the following has no units of its K_cvalue

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NaHCO₃is commonly called

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Soda ash

Baking soda

Washing soda

None of these

Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known as

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Wurtz reaction

Cannizzaro reaction

Friedel Craft reaction

Claisen reaction

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