Question # 1

The oxidation number of chromium in K₂Cr₂O₇ is:

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+2

+6

+7

+14

10 gram sugar is dissolved in 90 gram of water to make a 100 gram solution.This solution is

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10% m/m

10% m/v

10% v/m

10% v/v

The absolute zero means:

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273.15 °C

-273.15 °C

0 °C

-373.15 °C

At ____________ °C water converts to ice.

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101°

100°

99°C

100.2°C

________________ elements were discovered in year 1800.

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34

35

36

37

Metals are covered by using.

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Baeyer's test

Bohr's

Electrolysis

None

The colour of calcium metal flame is

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Golden yellow

Brilliant white

Brick red

Light green

105 elements were discovered by the year ________________

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1984

1974

1086

1996

The 2nd and third periods are called

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short period

Normal period

Long period

Very long period

Which one of the following non-metal is lustrous?

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Sulphur

Phosphorus

Iodine

Carbon

Half life of C-14 ________________ years.

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5800

5700

5600

5500

A complete reaction is one is which.

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All the reactants convert into products.

All the reactants do not convert into products.

Half reactants convert into products.

Only 10% reactants convert into products.

Which acid is found in Ant sting?

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Citric Acid

Formic Acid

Uric Acid

Sulphuric acid

According to Bronsted and Lowry concept an acid is a substance that can donate.

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Proton

Electron pair

Neutron

Electron

Dynamic means, reaction is:

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In forward direction

Stop

In reverse direction

Still continuing.

Which one is used for alkaline batteries?

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NaOH

Ca(OH)₂

KOH

Mg(OH)₂

The lives of aquatic plants and animals are indirectly related to concentration of dissolved gas in water.

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Nitrogen

Hydrogen

Oxygen

Carbon

Which is used for cleaning agent for domestic and commercial purpose?

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NaCl

Na₂CO₃

NaHCO₃

Na₂SiO₃

Proteins are polymers of.

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Polysaccharide

Oligosaccharids

Amino acid

Nucleic acid

The water which produces good lather with soap is called:

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soft water

hard water

heavy water

typical water

Olefins is a Latin word meaning:

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inert

less reactive

oil forming

most reactive

Which acid is used an electrolyte in lead storage battery?

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H₂SO₄

HNO₃

HCl

CH₃COOH

If an endothermic reaction is allowed to take place very rapidly in the air, the temperature of the surrounding air

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Remains constant

Increase

Decrease

Increase a bit

Azeotrpic mixture of two liquids boils at a lower temperature than either of them, when

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It is saturated

Is shows positive deviation from Raoult's law

It shows negative deviation from Raoult's law

Is is metastable

Rutherford's model of atom failed because

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The atom did not have a nucleus and electrons

It did not account for the attraction between protons and neutrons

It did not account for the stability of the atom

There is actually no space between the nucleus and the electrons

Which of the following molecules have unpaired electrons is the bonding molecular orbitals.

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N2

O2

B2

F2

The optimum temperature for the synthesis of NH3 by Haber's process is.

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200 ^oC

300 ^oC

400 ^oC

500 ^oC

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

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Effusion

Diffusion

Osmosis

Evaporation

The number of bonds in nitrogen molecule is

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One o and oneπ

One o and twoπ

Three sigma only

Two o and twoπ

What is bond order.

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Number of unpaired electrons

Number of paired electrons

Number of electrons present in antibonding molecular orbital

Number of bond formed between two atoms after overlap

Which statement is incorrect about 64 g of SO2.

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It is one mole SO2

The number of SO2 molecule are 6.02 x 10²³

The number of oxygen atoms are 6.02 x 10²³

The number sulphur atom are 6.02 x 10²³

In order to mention the B.P. of water at 110°C, the external pressure should be

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Between 760 torr and 1200 torr

Between 200 torr and 760 torr

760 torr

Any value of pressure

Both CH4 and NH3 are four electron pair system the angles of CH4 and NH3 are 109.5^o and 107.5 ^o respectively. This deviation is due to.

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Hydrogen bonding in ammonia

Lone pair attraction

Lone pair occupy more space and repel to other bond pairs

Lone pair lone pair repulsion

Acetic acid is commercially prepared form

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Ethene

Ethane

Ethyne

Ethanol

Which one of following is used in cosmetics

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Talc

Asbestos

Sodium sulphate

Aluminium Sulphate

In which group of periodic table is the element which has atomic number 14.

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II

IV

III

VI

Ethanol on dehydration can be changed to

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Ethene

Diethyl ether

Both 'a' and 'b'

None of these

Which one of the following elements exhibits s-inert pair effect.

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B

Al

Pb

Sc

Which is not coloured ion

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SO4^-2

MnO4-3

CrO4^-2

Cr2O7^-2

Which one of the following polymers has no peptide linkage in it.

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Terlene

Nylon -6,6

Protein

None of these

Which one of the following is inorganic polymer

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Graphite

Rubber

DNA

Protein

Which one of the following products is not formed when acetic acid reacts with PCl5

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C2H5Cl

HCl

POCl3

CH3COCl

Micronutrients for plant are those which

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Are required in very large amount

Are required in very small amount

Are produced from plants in very small amount

Retard the growth of plants

The conversion of ethanol to ethene is an example of.

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Dehydration

Hydration

Hydrogenation

Fermentation