Question # 1

The metallic plates through which electrons enters and leaves electrolytes:

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Wires

Electrodes

Both

Nil

The number of electrons in K shell of O is ________________

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9

10

2

1

The oxidation number of chromium in K₂Cr₂O₇ is:

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+2

+6

+7

+14

Force per unit area is called:

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volume

pressure

weight

density

The period of Alchemists extends from _________ AD.

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800 to 1800

600 to 1600

900 to 1900

700 to 1700

Mass per unit volume is:

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Velocity

Dencity

Pressure

Nil

Li belongs to ________________ block.

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s

p

d

f

How many numbers of moles are equivalent to 8 grams of CO₂?

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0.15

0.18

0.21

0.24

Sort out a compound from the following

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Air

Salt

Ice-cream

Iron

Which element has highest electronegativity?

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CI

F

Br

I

L shell can accommodate ________________ electrons.

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2

8

18

32

Such reactions which continue in both directions are called.

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Irreversible

Reversible

Nonreactive

Dynamic

Chemical formula for urea is:

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NH4CNO

NH4CH

NH2CONH2

NH4CI

Fructose contain group.

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Ketone

Aldehyde

Alcoholic

Alkyl

At equilibrium state there are possibilities: OR types of chemical equilibrium are.

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1

2

3

4

Which diseases cause by the deficiency of vitamin E?

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Rickets

Anemia in babies

Scurvy

Night blindness

Which one is not a characteristic of an acid:

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it turns red litmus blue

it reacts with base to form salt and water

Its aqueous solution conduct electric current

it has sour taste

Normally rain water is weakly acidic because of.

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SO₃ gas.

CO₂gas.

SO₂gas.

NO₂gas.

The process by which atmospheric nitrogen is turned into nitrates in the soil is called.

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Nitration

Fixing

Oxidation

Reduction

Ammonical brine is prepared by dissolving ammonia gas in.

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NaCl

CaCO₃

CaCl₂

Na₂SO₄

Which one of the following is testeless?

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Sucrose

Glucose

Fructose

Starch

Eye inflammation is caused by the deficiency of vitamin.

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Vitamin D

Vitamin C

Vitamin B

Vitamin A

Molal boiling point elevation depends upon

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Nature of solvent

Natrue of solute

Vapour pressure of solution

None of these

The molal boiling point constant is the ratio of elevation of boiling point to

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Molarity

Mole fraction of solvent

Molality

Mole fraction of solute

The comparative rates at which the solutes move in paper chromatography, depends on

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The size of paper used

Their R_fvalues

Their partition coefficients

The polarity of solvent used

Many elements have fractional atomic masses. This is because

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The mass of the atom is itself fractional

Atomic masses are average masses of isobars

Atomic masses are average masses of isotopes

Atomic masses are average masses of isotopes proportional to their relative abundance

Which one of the following substances is not used as drying agent in desiccators.

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Calcium chloride

Phosphorus pentoxide

Silica gel

50% NaCl

The bond angle in NH3 molecule is

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109.5^o

107.5^o

104.5^o

106^o

Spontaneous processes are mostly

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Reversible

Irreversible

Not irreversible

None of these

Which is not use of liquid crystals.

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Temperature sensor

Liquid crystal display

Skin thermography

Energy supply in electrical devices.

In a solution 7.8 g of benzene and 46 g of toluene is present The mole fraction of benzene is.

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1/2

1/3

1/5

1/6

NaCI and sand can be separated by one of the following without filtration

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Formation of solution and filtration

Formation of solution and evaporation without filtration

Sublimation

Chromatiograghy

Which of the following molecules contain six bonding electrons.

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CH4

CO2

BF3

H2S

Formalin is a 40% solution of

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CH₃CHO

CH₃OH

HCHO

CH₃OCH

Which metal is used in the thermite process because of its activity.

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Iron

Copper

Aluminium

Zinc

Aluminium oxide is.

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Acidic oxide

Basic oxide

Amphoteric oxide

None of these

Amongst the following, the compound of that can be most readily sulphonated is

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Toluene

Benzene

Nitro-benzene

Chloro-benzene

Which class of compounds can not show positional isomerism.

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Alkanes

Alkene

Alkynes

Alcohol

Catalyst used in thermal cracking

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Platinum

Nichel

Al2O3 and SiO2

Fe2O3 and CuO

In aqua regia, the ratio of conc. HCl to Conc. HNO3 is

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1 : 1

2 :1

1:2

3 : 1

Which one of the following acids acts as oxidizing agent but never a reducing agent.

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HCIO

HCIO2

HCIO3

HCIO4

Ozone depletion in stratosphere region is mainly due to the reaction of O3 with

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O2

SO2

CFCs

All of these

Structure of benzene is

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Tetrahedral

Trigonal planar

Hexagonal planar

Linear

The thickness of ozone layer is.

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25 to 50 km

25 to 28 km

3 km only

1 km only