Question # 1

The molar mass of H₂SO₄ is:

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98 g

98 amu

9.8 g

9.8 amu

The symbol of sodium is :

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Sa

Na

Pa

Ca

An ion is a charged particles:

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True

False

In some conditions

Never

Hydrogen is a ____________

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Metal

Non metal

Metalloids

Nil

In ________________ Rutherford's was studying radiations.

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1911

1931

1921

1922

The isotopes C-12 is present in abundance of:

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96.6%

97.6%

99.7%

None of these

The maximum no.of electrons that can be accommodated in M shell are

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2

8

18

32

In silver plating Anode is made of:

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Gold

Ag

Neon

Nil

The atomic number of potassium is:

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11

15

18

19

How many number of electrons take part in triple covalent bond?

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2

4

6

8

Hydrogen has ________________ isotopes.

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1

2

3

4

General formula of alcohols is:

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RCHO

ROH

O= R - C -OH

O = R - C- R

Coal gas is mixture of

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CO and CH₄

CO . CH₄. CO₂

CO, CH₄, H₂

CO, H₂ and CO₂

When the magnitude of Kc is very large in indicates.

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Reaction never go to completion

Reaction is in equilibrium state

Reaction will complete after some time

Reaction has almost to completion

Which one of the following is a synthetic fibre?

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Cotton

Wool

nylon

silk

Coal tar contains compounds

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Benzene

Phenol

Toluene

All

Pentahydroxy ketone is called as:

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Glucose

Fructose

Starch

Sucross

Vibrious cholera bacteria causes the disease

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Cholera

Diarrhea

Jaundice

Hepatitis

Which hydrocarbon decolorizes the pink colour of acidic solution of potassium permanganate?

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CH₄

C₂H₄

C₂H₆

C₂H₅

Incomplete combustion of alkanes produces.

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Carbon dioxide only

Carbon monoxide only

Carbon monoxide and carbon black

Carbon dioxide and carbon black

Which is used to manufacture of soap?

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NaOH

Ca(OH)₂

KOH

Mg(OH)₂

Chalco-pyite is an ore of:

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iron

aluminium

silver

copper

Standard enthalpy of combustion of carbon is -394 kJ mol-1 than, which is the standard enthalpy of formation of CO2

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+394 kJ

-394 kJ

0 kJ

+197 kJ

Molecule in which the distance between two carbon atoms in the largest is.

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C2H6

C2H4

C2H2

C6H6

Borax has the chemical formula.

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KNO3

Na2B3O7.10H2O

Na2CO3

NaNO3

In chromatographic technique. Rf has unit.

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Mol dm-3

Cm

m3

No units

How many balloon of 0.25 dm3 capacity at 1 atmospheric pressure can be filled from a hydrogen gas cylinder of 5 dm3 capacity at 10 atmospheric pressure.

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50

90

180

200

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

The tendency of an tom to attract shared pair of electron towards itself is called its.

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Ionization energy

Electronegativity

Electron affinity

dipole moment

Electromotive force of the cell is the

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Difference of two electrode potentials

May be sum or the difference of two electrode potentials

Sum of two electrode potential

Depends upon the nature of the cell

Exceptionally low acidic strength of HF is due to.

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Strong polar bond between H and F

Smaller size of fluorine

Strong hydrogen bonding

electronegativity of fluorine

Nickel has isotopes

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3

5

6

11

Mass of 22.4 dm3 of N2 at STP is.

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28 gm

14 gm

1.4 gm

2,8 gm

Fungicides are the pesticides which

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Control the growth of fungus

Kill insects

Kill plants

Kill herbs

Ca Mg3 (SiO3)2 is the composition of.

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Dolomite

Gypsum

Calcite

Asbestos

Which one of the following elements has no variable valency.

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Zinc

Iron

cobalt

Manganese

Which set of Hybrid orbital has planner triangular shape

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sp

sp²

dsp²

sp³

Phosphorous helps the growth of

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root

leave

stem

seed

Aluminum reacts with nitrogen to form

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AIN

Al₂N

Al₂N₃

Al₄N₆

Which condition are not suitable for the growth of enzymes.

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Temperature between 25 ^oC to 37 ^oC

Solution must be dilute

Environment must be aerated

Some preservative should be present in solution

Which one of the following compound is not of a polymer.

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Starch

Glucose

Protein

Nylon -6, 6

Sulphur is essential constituent for plants. Which is not role of sulphur

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Chlorophyll development

Development of root system

Constituents of some proteins

Increase transpiration force

Hydrogen bond is the strongest between the molecules of.

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HF

HCl

HBr

HI

Oxime is an addition product obtained when aldehydes react with.

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HCN

NH2OH

Phenyl hydrazine

H2O