Question # 1

The no. of Ion pair/pairs in ammonia molecule is / are

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1

2

3

4

In 9th century scientist accepted by:

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Dalton

Bohars

Rutherford

Nil

biology bis classified as ___________ science.

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Engineering

Physical

Natural

Chemical

The core of the earth is mostly made from ____________

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Nickel

Iron

A % B

Copper

The concept of orbit was used by:

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J.J Thomson

Rutherford

Bohr

Planck

Elements are represented by chemical _________

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Abbreviation

Unit

Symbols

It can be represented

The practical unit of concentration is

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%v/v

%v/m

%m/m

M

Which one of the following metals burns with a brick red flame?

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Sodium

Magnesium

Iron

Calcium

Amadeo Avogadro was a _______________ scientist.

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Italian

English

Greek

Russian

The SI unit of pressure is:

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N

N/m²

Pascal

atm

The right most position in the periodic table is occupied by:

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Alkall metals

Alkaline earth metals

Translation metals

Noble gasses

Ozone is formed in:

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Troposphere

Stratosphere

Mesosphere

Thermosphere

Which of following is not amphoteric?

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H₂O

NH₃

HCO₃

SO₄

A disease is caused by excess of bile pigments in the blood is.

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Typhoid

Jaundice

Cholera

Dysentery

The unit of molar concentration:

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mol. dm^-2

mol. dm^-1

mol. dm

mol. dm^-3

Fossil fuel means.

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Coal

Petroleum

Natural gas

All of them

99% of atmosphere consists of .

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N₂and H₂

N₂and O₂

N₂and CO₂

O₂and CO₂

Which one of the following are amorphous solids?

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Monosacchrides

Oligosaccharides

Polysaccharides

All of them

The lives of aquatic plants and animals are indirectly related to concentration of dissolved ------ in water:

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hydrogen

oxygen

chlorine

nitrogen

When bones are heated they give.

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Starch

Gelatin

Fats

Oils

Which gas protects the Earth's surface from ultraviolet radiations?

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CO₂

CO

N₂

O₃

Industrial effluents are highly

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Toxic organic compounds.

Inorganic salts.

Heavy metals

All of them

In which compound oxidation state of chlorine is +5

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NaCl

HOCl

NaClO3

NaClO2

Which of the following precautions in necessary for smooth filtration

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The filter paper should be of big size

The tip of funnel should not touch the side of the beaker

The stem of the funnel should be very small

The stem of he funnel should remain continuously full of liquid

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

London dispersion forces are the only forces present among the

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Molecules of water in liquid state

Atoms of helium in gaseous state at high temperature

Molecules of solid iodine

Molecules of hydrogen chloride gas

Conductivity of metal decreases by increasing temperature because.

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Atoms are converted to ions

Atoms oscillates and hinder the movement of free electrons.

Ions are converted into atoms

Velocity of mobile electrons increases

Compound which undergo sublimation is

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KMnO4

CaCO3

NH4Cl

Na2CO3

When aqueous NaCl is electrolyzed, which of the following ions gas discharged at anode.

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Cl-

OH-

Na+

H+

Transition from various energy levels to the lowest energy level gives.

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Lyman series

Balmer series

Panchen sereis

Pfund series

The charge on electron was determined by millikan in his oil drop experiment and its value is

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6.023 x 10^-23C

1.602 x 10^-23C

1.602 x 10^-19C

6.625 x 10^-34C

"The components of which mixture can be separated by filtration".

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NaCl and CaCl2

Calcium carbonate and NaCl

Blue and green inks

Sand and naphthalene

The largest number of molecules are present in

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3.6 of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

Which type of coal has greater percentage of carbon.

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Peat

Lignite

Bituminous

Anthracite

Which one of the following elements burns in air to form an oxide which, when shaken with water, give a solution with a pH greater than 7.

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Carbon

Magnesium

sulphur

Hydrogen

Which one of the following is not amino acid.

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Alanine

Glycine

Aspartic acid

Aniline

The chief of aluminum is

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Na₃AlF₆

Al₂O₃.2H₂O

Al₂O₃

Al₂O₃.H₂O

Which one of the following gases exist in monoatomic form.

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Ozone

Nitrogen

Krypton

Phosphine

Which of the following is non-typical transition element

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Cr

Mn

Zn

Fel

Which of the following noble gas is used for arc welding and cutting

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Helium

Argon

Xenon

Radon

Chlorine heptoxide reacts with water to form

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Hypochlorous acid

Chloric acid

Perchloric acid

Chlorine and oxygen

Which compound form benzoic acid on oxidation with strong oxidizing agent.

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Toluene

Ethyl benzene

n propyl benzene

All

Which gas is used for artificial ripening of fruits

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Ethene

Metheane

Propane

Ethyne

The presence of a double bond in a compound is the sign of

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Saturation

Un-saturation

Substitution

None of these