Question # 1

Which of the following is halo form

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CHBr₃

CHCI₃

CHI₃

All of these

The use of tetra ethyl lead in petrol as an efficient antiknock agent is being discouraged. Which reason is correct

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It is costly

It damages the engine

Pb is difficult to obtain in bulk quantities

The combustion product, lead, causes air pollutions

Chief ore of aluminium is:

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Na₃AIF₆

Al₂O₃.2H₂O

Al₂O₃

Al₂O₃ .H₂O

Which has greater number of moles

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0.1 g sodium

6.02 x 10²⁰atoms of magnesium

20 cm³0.1mole per dm³of NaOH

12.2 dm³of nitrogen at standard

[A_rNa = 23, Mg = 24, O = 16]

Iodine value of an oil or fat may be defined as

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The number of grams of iodine taken up by 1 g of the oil or fat

The number of grams of iodine taken by 10 g of the oil or fat

The number of grams of iodine taken by 100 g of the oil or fat

None of the above

The nitration of benzene takes place when it is heated with a mixture of conc.HNO₃and conc. H₂SO₄at 50°C in ratio of

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1 : 2

1 : 1

1 : 3

2 : 1

The rate of reaction :

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Increase as the reaction proceeds.

Decreases as the reaction proceeds.

Remains the same as the reaction proceed.

May decrease or increase as the reaction proceeds.

All are ortho & Para directing except

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X

OH

NR₃

NH₂

The compounds or species in search of electrons are called

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Elctrophiles

Nucleophile

Nitrities

Bases

The electrophile in aromatic sulphonation is

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H₂SO₄

HSO₄

SO₃

SO₃⁺

The branch of science dealing with structure, composition and changes in matter and laws and principles which govern these changes is called as

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chesmistry

Geology

Physics

Mechanics

XeF₄has shape of

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Sphere

Trigonal bipyramidal

Tetrahedral

Square planar

The functional group isomer of dimethylether is

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Ethyl alcohol

Propyl alcohol

Diethyl ether

Butyl alcohol

A solution having pH = 4 its OH^-ion concentration in mole dm^-3is

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1.0 x 10^-4

1.0 x 10^-10

1.0 x 10^-14

1 x 10⁰

Crystalline form of sulphur stable at room temperature is

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Rhombic sulphur

Monoclinic sulphur

Plastic sulphur

Prismatic sulphur

Polymerization of ethane take place at pressure of 100 atm and a temperature of

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200°C

400°C

600°C

800°C

Any property which depends upon the T.P and V is said to be

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Property due to k.E.

Property due to PE

Both a and b

Thermodynamic state

A solution contains 1.2046 x 10²⁴hydrochloric acid molecules in one dm³of the solution. The strength of the solution is

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6 N

2 N

4 N

8 N

The ore CaSO₄2H₂O has the general name

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Gypsum

Dolomite

Calcite

Epsom salt

The colour of the transition metal compounds is due to

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p-d transition

d-d transition

s-p transition

None of these

Which one of the following has been hydroxyl and carboxylic acid groups

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Phenols

Picric acid

Phthalic acid

Salicylic acid

Boiling point of acetic acid is°C:

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116

117

118

119

Which carbon is more electronegative?

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sp³- hybridized carbon

sp-hybridized carbon

sp²-hybridized carbon

always same irrespective of its hybrid state

Poly hydroxyl compounds of aldehyde and ketones are:

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Carbohydrates

Proteins

Fats

Lipids

Pressure volume work is

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Complex protein molecules which catalyses the organic reactions in the living cells are called

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Living organisms

Enzymes

Viruses

Bacteria

Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called

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Stark effect

Zeeman effect

Compton effect

Photoelectric effect

Vinegar made form cane sugar, now a days synthetically contains

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Citric acid

Lactic acid

Acetic acid

Palmitic acid

According to VSEPR theory, the shape of the water molecule is

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Octahedral

Distorted tetrahedral

Planar triangle

Linear

Variable valency is generally exhibited by

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Normal elements

Transition elements

Metallic elements

None of these

The active part in a molecule is called

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Homologous series

Functional group

Chemical bonding

Ionic complex

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