Question # 1

Which of the following element is most reactive

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Li

Na

K

Cs

Which of the following favours the reverse reaction in chemical equilibrium?

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Increasing the concentration of the reactant

Removal of the least one of the products at regular intervals

Increasing the concentration of one or more of the products

None of these

The formula of secondary alcohol is

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R - OH

R - CH₂OH

R₂CHOH

R₃COH

Na reacts with phenol to produce

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H₂gas

Benzene

CO₂gas

CO gas

Electronegativity order of alkyl halides is:

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Rl > RBr > RCl > RF

Rbr > RCl > RF >Rl

RCl > RF >Rl > RBr

RF >Ri > RBr >RII

The empirical formula of a compound is CH₂O. What may be the compound

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C₂H₅OH

C₆H₅OH

HCOOH

Increased asthmatic attacks in certain seasons are related to

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Inhalation of seasonal pollen

Eating of seasonal vegetables

Low temperature

Wet and dry environment

Which of the following is halo form

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CHBr₃

CHCI₃

CHI₃

All of these

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The substance upon which an enzyme acts is known as its

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Domain

Field

Substrate

Reactant

Which of the following has zero depole-moment?

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CIF

PCl₃

SiF₄

CFCl₄

Which is not a fossil fuel

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Petroleum

Coal

Natural gas

None of them

Hydrocarbons contain

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C and S only

C and H only

C, H, and O only

C, H, O and N only

The difference between amount of heat actually released and that of calculated is called

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Bonding energy

Activation energy

Resonance energy

Transition energy

The solution of which acid is used for seosoning of food ?

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Formic acid

Acetic acid

Benzoic acid

Butanoic acid

Atoms obey octet rule by sharing-electrons making covalent bonds according to

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Lewis and Kossal theory

Valance bond theory

VSEPR theory

Molecular orbital theory

The best electrode used in salt bridge is KCl. Which other electrolyte an also be used for the purpose :

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NaCl

NH₄NO₃

KNO₃

NaNO₃

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

The bond angle H - O - H in ice ins closest to

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120° , 28^'

60°

90°

109°

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

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 amino acids which human body can synthesize are called ______ amino acid

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Essential

Non essential

Acidic

Basic

Orlon is a polymer of

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Tetrafluoroethylene

Acrylonitrile

Ethanoic acid

Benzene

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

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O₂

N₂

Br₂

F₂

Major component of natural gas is:

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Ethane

Ethene

Propane

Methane

By applying Hess's law, we can calculate

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ΔH

ΔS

ΔF

K

Eletronegativity difference in C-C bond in alkanes is:

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Zero

Double

Half

4.0

Which of the following is a biodegradable polymer?

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Cellulose

Polyethene

Polyvinyl chloride

Nylon-6

The molarity of solution containing 14.5 grams urea (N₂H₄CO) dissolved in 100 cm³of the solution is

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1 molar

0.1 molar

0.2 molar

0.25 molar

Silver oxide battery has a voltage of

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2.0 V

1.5 V

2.5 V

1.0 V

Which of the following forms a toxic substance in blood by combing with hemoglobin?

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Carbon dioxide

Carbon monoxide

Oxygen

Methane

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