Question # 1

Generally electron affinities for elements in a period from left to right

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Decreases

Increases

Remain same

Increases alternatively

The theory of chemical bonding has been a major problem of:

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Modern Physics.

Modern Chemistry.

Modern Biology.

Mechanics.

The unit of specific conductivity is

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Ohm cm^-1

Ohm cm^-2

Ohm^-1cm

Ohm^-1cm^-1

A solution of NaOH has pH = 13, then concentration of NaOH is

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10^-13M

10¹³M

10^-1M

10⁺¹M

The percentage of nitrogen in ammonia is

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80%

82%

90%

50%

The solubility product of AgCl is 2.0 x 10^-10mole ²dm^-6. The maximum concentration of Ag⁺ions in the solution is

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2.0 x 10^-10mole dm^-3

1.41 x 10^-5mole dm^-3

1.0 x 10^-10

4.0 x 10^-20mole dm^-3

pH of 1 molar NaOH is

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7

zero

14

10

Ketones are reduced to

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Primary alcohol

Secondary alcohol

Tertiary alcohol

All of these

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

Alkenes combine readily with electrophillic reagents such as halogens giving

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Haloalkanes

Gem-dihalides

Vicinal dihalides

Vinyl halides

Mild oxidation of glycerol with H₂O₂/FeSO₄gives

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Glyceraldehyde

Dihydroxy acetone

Glycerose

None

A reaction is reversible because :

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Products are stable.

Reactants are reactive.

Products are reactive.

Reactants re stable.

For a given process the heat change at constant pressure q_pis related to the heat change at constant volume (q_v) according to

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q_p= q_v

q_p< q_v

q_p> q_v

q_p= qv/2

For every reaction occurring in the body three is at least one type of

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Enzyme

Vitamin

Protein

Amino acid

A free radical reaction takes place in three steps, initiation, propagation and terminations. Which of the following expression represents a propagation step

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Cotton is ______% cellulose

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90

100

99

30

Treatment of a secondary alcohol with a suitable oxidizing agent (K₂Cr₂O₇) results in the formation of

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Ketone

Aidehyde

Ether

Alkyl halide

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Plank's equations

de Broglie's equations

Heisenburg's equation

None

Aromatic hydrocarbons are the derivatives of

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Normal series of paraffins

Alkene

Benzene

Cyclohexane

Ionic hydrides are generally

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Liquid at room temperature

Good electrical conductors

Good reducing agents

Easily reduced

A compound contains 75% carbon and 25% hydrogen, by mass. What is the molecular formula of the compound/

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C₃H₈

CH₄

C₂H₄

C₂H₆

The elements of f-block are also known as

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Inner-transition

Outer transition

Normal elements

Alkaline earth metals

When cathode rays strike the anode metal X-rays are emitted and not the positive rays because

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Cathode rays are material particles

Cathode rays knock out electrons from anode, which emit X-rays when outer electron take their place

Cathode rays are absorbed by the nucleus

Cathode rays become heated

Best medhod of preparation of alkyl halide from alcohals is by its reaction with:

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HX

SOCl₂

Px₅ and PX₃

All

Dipole moment of CO molecule is:

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0.0

1.112 D

0.112 D

2.112 D

Iodoform test is given by:

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Formaldehyde and Higher ketones

Formaldehyde

Acetaldehyde and methyl ketones

Acetaldehyde

β-D-glucose is a monomer for

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Strach

Cellulose

Glycogen

Protein

Which is the transition element among the following

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B

Al

Cu

Cs

Phenol is also known as

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Acetic acid

Carbolic acid

Tararic acid

Trichloroacetic acid

Reaction of ethanes with KMnO₄gives:

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Ozonide

Glyoxal

Glycol

Oxalic acid

Violet colour is obtained when dilute CuSO₄is added in alkaline solution of protein. This test is known as

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Biuret

Xanthoproteic test

Hopkins-cole

All of these

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