Question # 1

An azeotropic mixture of two liquids boils at a lower temperature than either of them when :

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It is saturated.

It shows positive deviation from Raoult's law.

It show negative deviation from Raoult's law.

It is metastable.

Elements combine together due to inherent tendency to stabilize themselves by:

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Losing electron.

Sharing electrons.

Gain in electrons.

All of above.

Alkanes may be prepared by the reaction of alkyl halides with

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Alcohol

Carboxylic acid

Grignard reagents

None of these

Electrochemical series is a list of element S arranged into the increasing order of their

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Standard oxidation potential

Standard reduction potential

Cell voltage

Ionization potential

The solution of which acid is used for seasoning of food

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Formic acid

Acetic acid

Benzoic acid

Butanoic acid

Number of elements present in 5th period is

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8

18

32

24

When an alcohol reacts with SOCI₂an alkyl halide is formed. What are two other products

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SO₂and HCI

SI₂and H₂O

HCI and H₂O

H₂S and HCI

The simplest and the parent members of aromatic hydrocarbon is

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Benzene

Toluene

Biphenyis

Naphthalene

The substances which soften the polymer are called

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Stabilizers

Plasticizers

Retarders

Pigments

2.5 faradays of electricity is passed through solution of CuSO_{4. The number of gram equivalents of copper deposited on the cathode would be}

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1

2

2.5

1.25

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84.84 %

89.89%

81.81%

90.90%

which enzyme is not involved in the fermentation of starch ?

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Diastase

Zymase

Urease

Invertase

Pro stand for

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Valine

Alamine

Glycine

Proline

The number of de-electrons retained in Fe²⁺(At.No. of Fe = 26) ions is

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3

4

5

6

Which the increase in carbon number of solubility of an alcohol

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Increases

Decreases

Remains unaffected

None of these

18 g glucose is dissolved in 90 g of water. The relative lowering vapor pressure is equal to :

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1/5

5.1

1/51

6

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A strong reducing agent

A strong oxidising agent

Better oxidising agent than hydrogen

Less reducing agent than hydrogen

Which orbital is in the process of completion in case of transition elements

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p-orbital

f-orbital

d-orbital

s-orbital

The substance which is present in large quantity is called a :

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Solute

Solvent

solutiion

None of Above

1.12 dm³of N₂gas at S.T.P. has mass of N₂gas

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2.8 g

2.4 g

1.4 g

14 g

Number of moles of solute dissolved in 1 Kg of solvent is knowns as

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Molarity

Formality

Molality

Mole fraction

Boiling point of acetic acid is°C:

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116

117

118

119

Which of the following will have the highest boiling point?

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Methanal

Ethanal

Propanal

2-Hexanone

Easter are pleasant smelling compounds. Which ester posseses odour like pineapple

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Amylacetate

Amylbutyrate

Ethylbutyrate

Benzylacetate

Identify the compound which has a bond angle of 109.5°

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Ethyne

Ethere

Methane

Benzene

Which of the following is a member of -block

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Zn

Al

B

Br

The characteristic reactions of alkanes are

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Addition reactions

Substitution reactions

Condensation reactions

Polymerization reactions

In its reaction with Na, 1 mol of X gives 1 mol of H_2(g). What is X

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CH₃CH₂CH₂CH₂OH

(CH₃)₃COH

CH₃CH₂CH₂CO₂H

CH₃CH(OH)CO₂H

Which of the following is a polyamide?

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Nylon

Orlon

Teflon

Terylene

Which of the following is not an ortho-para directing group

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Which property is not present in lipids?

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Liquid

Solid or semi solid

Soluble in water

Form emultion

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