Question # 1

Diamonds exists in ____________ form.

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Cubic

Linear

Circular

Nil

The absolute zero means:

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273.15 °C

-273.15 °C

0 °C

-373.15 °C

In diamonds, carbon are ____________ bonded.

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Tetrahedrally

Single

Double

None

Mass no is represented by :

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A

B

C

D

Bucky Balls are used as ________________

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Cutting

Grafting

Lubricants

Nil

Smoke in air is the example of solution.

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Gas in Gas

Gas in liquid

liquid in Gas

Solid in Gas

NaOH is prepared by ____________ of NaCL (aqueous).

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Electrolysis

Decomposition

A & B

Nil

The colour of calcium metal flame is

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Golden yellow

Brilliant white

Brick red

Light green

The lowest energy level is

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K

L

M

N

Group runs from ________________

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Top to bottom

Left to right

Top to right

Bottom to left

Ionic compound are ________________ in water.

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insoluble

Soluble

Covalent

Solvent

Cause of global warming is:

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CO₂gas

SO₂gas

NO₂gas

O₂gas

Oxidation of ethene with KMnO₄produces.

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oxalic acid

glyoxal

ethene glycol

Propene glycol

General formula of alkynes is:

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C_nH_n

C_nH_2n

C_nH_2n+2

C_nH_2n-2

Atmosphere is divided into;

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3 regions

4 regions

5 regions

6 regions

When Bronsted and Lowry put forward acid base concept?

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1913

1923

1933

1943

Reactions which have comparable amounts of reactants and products at equilibrium state have:

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very small Kc value

Very large Kc value

Moderate Kc value

None of these

Which gas creates suffocation and causes death?

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CO

CO₂

SO₃

SO₂

Amino acid are the building blocks of .

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Proteins

Carbohydrates

Vitamins

fats

In which one of the following is a substitution reaction?

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Halogenations of alkynes

Halogenations of alkenes

Halogenations of alkanes

Bromination of alkenes

Phenolphthalein produces red colour in

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Acid

Base

Both a and b

None of these

the removal of which ion causes water softening.

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Na⁺

Mg²

Li⁺

K⁺

The spreading of fragrance of a rose or scent in air is due to.

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Effusion

Diffusion

Osmosis

Evaporation

The electrode reaction of a voltaic cell can be reversed when

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Concentrations of solutions are changed

Temperature is increased

Electrodes are interchanged

Electric circuit is employed to supply the source of electricity

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Fe is reduced

Fe is oxidized

CI₂is oxidized

None of these

Total pressure of mixture of two gases is.

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The sum of their partial pressures.

The difference of their partial pressures

The product of their practical pressures

The ratio of their partial pressures

Feeling uncomfortable breathing in un pressurized cabins is due to

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High pressure of CO2

Fatigue

Low pressure of O2

Low presssure of CO2

According to classical concept, oxidation involves

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Addition of oxygen

Addition of electron

Removal of hydrogen

All are correct

Which compound does not obey the octet rule.

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NH3

BCl3

H2O

CH4

Which acid has less value of pKa.

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CH3COOH

H2S

H2CO3

HCl

Diamond is bad conductor because.

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It has a tight structure

It has a high density

It is transparent to light

There are o free electros present in the crystal of diamond to conduct electricity.

The number of Na, ions which surround each CI^1-ion the NaCI crystal lattice is

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8

12

6

4

The distillation of a solution under reduced pressure is called

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Fractional distillation

Destructive distillation

Distillation

Vacuum distillation

The enzyme which bring about exchange of functional group between two compounds is called.

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Hydrolases

Transferase

Lyases

Ligases

Which is the strongest acid

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HCIO

HCIO₂

HCIO₃

HCIO₄

Aluminium oxide is

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Acidic oxide

Baric oxide

Amphoteric oxide

None of these

Tincal is a mineral of.

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Al

B

Si

C

Main source of aromatic compound is

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Petroleum

Coaltar

Living organisms

Dead marine animals

Which substance is used in photography

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AgCl

AgBr

AgI

Ag3PO4

The process in when alkene are converted into carboxylic acid is known as

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Oxidation

Reduction

Hydrolysis

Hydration

Ionization energy of calcium is.

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Lower than that of barium

Lower than that of magnesium

Higher than that of beryllium

Lower than that of strontium

Grignard reagent is reactive due to

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The presence of halogen atom

The presence of Mg atom

The polarity of C -Mg bond

None of the above

Acetic acid is commercially prepared form

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Ethene

Ethane

Ethyne

Ethanol

The anhydride of HCIO₄is

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CIO₃

CIO₂

Cl₂O₅

Cl₂O₇