Question # 1

It is heterogeneous mixture

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Sand

Milk

Air

Brass

________________ are formed from chemical reactions.

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Elements

Mixture

Substance

Nil

Hydrogen is a ____________

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Metal

Non metal

Metalloids

Nil

Which one of the following will not react with dilute HCI?

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Sodium

Potassium

Calcium

Carbon

Molarity is the number of moles of solute dissolved in:

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1 kg of solution

100 g of slovent

Idm³ of solvent

I dm³ of solution

The example of solution of a solid solute in a solid solvent is

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Brass

Fog

Cheese

Air

Amadeo Avogadro was a _______________ scientist.

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Italian

English

Greek

Russian

Fog is an example of ____________ in gas.

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Solid

Liquid

Gas

Plasma

Number of protons+ neutrons is :

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Atomic mass

Mass numbers

Both

Nil

Atoms are arranged in ________________ structure in Bucky balls.

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Hollow

Cage

A & B

Nil

Na__ Na++ e , what type of ionit is :

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Positive

Negative

Neutral

Charged

Halogenation of alkanes in the presence of diffused sunlight takes place.

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Suddenly, only in one step

Slowly in one step

In a series of step

Fastly in two steps

The layer above troposphere extend upto 50 kilometers called.

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Mesosphere

Hydrosphere

Stratosphere

Thermosphere

When the magnitude of Kc is very large it indicates.

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Reaction mixture consist of almost all products.

Reaction mixture consist of almost all reactants.

Reaction has not gone to completion

Reaction mixture has negligible products.

The bond in the product of lewis acid base reaction.

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Ionic

Covalent

Metallic

Coordinate covalent

Which of following is not amphoteric?

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H₂O

NH₃

HCO₃

SO₄

Which one of the following diseases severe diarrhea and can be fatal?

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Joundice

Cholera

Dysentery

Typhoid

Which of one the following is Lewis base?

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BF3

H+

NH3

Ag+

Which acid used for food preservation?

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H₂SO₄

HNO₃

HCl

CH₃COOH

Froth flotation process is used to concentrate.

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Copper ore

Iron ore

Chromium ore

Aluminum ore

Rapid growth of algae in water bodies is because of detergent having.

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Carbonate salts.

Sulphonic acid salts.

Sulphate salts.

Phosphate salts.

At equilibrium state, when reaction cases to proceed, it is called:

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equilibrium constant

dynamic equilibrium

static equilibrium

simple equilibrium

The e/m value for the positive rays in maximum for the gas.

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Helium

Oxygen

Nitrogen

Hydrogen

Rutherford's model fo 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

Their is actually no space between the nucleus and the electrons.

In Daniel cell, if salt bridge is removed between the two half cells, the voltage.

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Drops to zero

Does not changes

Increases gradually

Increases rapidly

Which of the following is true for ionic compounds

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They are non-electrolytes in the molten state

They have bonds which are directional

They conduct electricity in solid state

They are generally more soluble in polar solvents than in non-polar solvents

Molal boiling constant for water is 0.52 ^oC. If 6 g of urea is dissolved in 100 g of water, what will be its boiling point.

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100.52 ^oC

-100.52^oC

100^oC

99^oC

Depression of freezing point method is used for determination of molar masses of

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Electrolytes

Non-volatile solids

Volatile solids

Volatile liquids

The drying agents used in desiccator is.

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BeCl2

MgCl2

CaCl2

SrCl2

Chemical reactivity of different substance is controlled by

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Atomic number

Electronic arrangement

Mass number

Number of isotope of reactant elements

Some impurities of MgCl2 are present in NaCl which separation technique can be used to separate the impurities.

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Filtration

Crystallization

Common ion effect

Chromatography

Weak intermolecular forces are present in.

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Only gases

Only liquid

Only solids

gases, liquids and solids

Which of the following solutions will have the highest boiling point

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0.1 M NaCI

0.1 M CaCI₂

0.1 M FeCI₃

0.1 M glucose

SN1 reaction usually occurs in

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Primary alkyl halides

Secondary alkyl halides

Tertiary alkyl halides

All of these

Which one of the following gases is used in welding purpose usually

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Methane

Ethane

Ethene

Acetylene

Which one of the following complexes is chelate.

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Potassium hexacyanoferrate (II)

Diammine silver (I) Chloride

Tetracarbonylnikel (0)

Sodium dioxalatoplatinate (II)

Which one of the following compounds is the isomer of ethyl alcohol.

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CH3OH

CH4OCH3

CH5-CH(OH)CH3

CH3OC2H5

Which of the following is a non typical transition element.

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Cr

Mn

Zn

Fe

All of the followings react with Fehling solution except

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CH2CH2CHO

CH3-CH2COCH3

HCHO

CH3-CHO

In a period, from left to right in the periodic table, the size of atom generally.

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Increases

decreases

Remains constant

First increase upto the middle of period and then decreases

In fluorescent tube, the gas filled is.

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He

Ne

Ar

Xe

Formation of cyanohydrin from an aldehyde in an example of.

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Nucleophilic substitution

Nucleophilic addition

Electrophilic addition

Electrophilic substitution

The variation pattern in ionic radii of first transition series shows

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A regular increase

A regulars decrease

No regular pattern

A regular decrease and than alight increase

The structure of Benzene is

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Hexagonal irregular

Tetrahedral

Trigonal planner

Hexagonal planner