Question # 1

Which one of the following alcohol is indicated by formation of yellow crystals in lodoform tesr?

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Methanol

Ethanol

Butanol

Propanol

Paramagnetic behaviour is caused by the presence of

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Unpaired electrons

Paired electrons

Paired protons

Paired electrons in an atom. molecule or ion

1 gram formula refers to

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Amount in grams equivalent to 1 mole of a atom

Amount in grams equivalent to 1 mole of a covalent compound

Amount in grams equivalent to 1 mole of a ionic compound

Amount in grams equivalent to 1 mole of an ion

The arrangement ABC, ABC .... is referred as

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cubic close packing

octahedral close packing

hexagonal close packing

tetrahedral close packing

Rancidification of fast and oils is due to:

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hydrolysis reaction

oxidation reaction

both a and b

hydrogenation reaction

The destructive distillation of coal gives three products. which of following is not the product of destructive distillation of coal?

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Coal tar

CO₂

Coal gas

Coke

D-block elements are also called

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Non-typical transition element

Outer transition elements

Abnormal transition elements

Inner transition

Primary, secondary aad tertiary alcohols can be identified and distinguished by

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Lucas test

lodoform test

Baeyer's test

Silver mirror test

In the atosphere, CO₂is about

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0.01%

0.03%

0.05%

0.09%

Which of the following alkyl halides shows higher reactivity?

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R __ F

R __ CI

R __ Br

R __ I

The substances added in paints for improving the mechanical properties is called:

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pigmein

filter

stabilizer

binder

Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:

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Millikan.

J. Perrin.

Hittrof

J.J. Thomson.

Which of the following is not affected by light

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The standard enthalpy change in the formation of 1 mole of a compound from its elements in their standard physical states is

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Enthalpy of formation

Enthalpy of atomization

Enthalpy of neutralization

Internal energy change

According to Raoult's law

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Relative lowering of V.P. is equal to mole fraction of solute

The lowering of V.P. is directly proportional to mole fraction of solute

V.P. of solvent above solution is equal to product of V.P. of pure solvent and mole fraction of solvent ins solution

All of the above

Which of the following is an aromatic compound

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Propanol

Cyclohexane

Acetone

Benezene

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Adding H₂O and H⁺ions

Adding OH^-ions

Adding O²molecules

Adding O atoms

With the progressive of the reaction the slope of the curve between concentration of product and time

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Gradually becomes more steep

Gradually becomes less steep

No change occurs in slope

None of these occurs

On passing HCI gas through a saturated solution of commercial sodium chloride, pure crystals of NaCI are precipitated due to

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Increase in pH of the solution

Decrease in pH of the solution

Common ion effect

Increase in ionization of NaCl

The element with highest electron affinity among the halogen is

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F

Cl

Br

I

In an experiment the concentration of a reactant 'A' is doubled the rate increases four times. If concentration in tripled, then rate increases nint times. Thus the rate is proportional to ______ of concentration of 'A'

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Square root

Square

Twice

Cube

The number of subatomic particles in atoms sidcovered is more than:

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110

100

125

90

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