Question # 1

Bell metal is an alloy of Sn and

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Copper

Iron

Zinc

Magnesium

Determination of atomic masses and invention of system of writing symbols was made by:

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J. Berzelius

Democritus

Dalton

None of above

Glyptal polymer is obtained from glycerol on reacting with

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Malonic acid

Phthalic acid

Maleic acid

Acetic acid

The wave number of the light emitted by a certain source is 2 x 10⁶m^-1. The wavelength of this light will be

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500 nm

500 m

200 nm

5 x 10⁷m

The fibre which is made form acrylonitrile as monomer

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PVC

Rayon fibre

Acrylic fibre

Polyester fibre

The reagents like KMnO_{4 and HCL cannot be filtered through Gooch crucible if its base is covered with :}

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Butterfly paper.

Ordinay paper.

Flying paper.

Filter paper.

When sulphur is boiled with Na₂SO₃solution, the compound formed is

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Sodium sulphides

Sodiums sulphates

Sodium persulphate

Sodium thiosulphate

Common names of carboxylic acids are given by then:

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Source

Person discovered

place

habit

Lime, calcium oxide, is used in agriculture for

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Adding ca metal in soil

Making soil acidic

Neutralizing acidic soil

Adding oxygen to soil

Strong reducing agents gave

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Greater positive value of standard reduction potential

Greater negative value of standard reduction potential

Lesser positive value of standard reaction potential

None of these

Which reaction is example of nucleophilic substitution

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Which of the following is an isomer of ethanol

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CH₃OCH₃

C₂H₅OC₂H₅

CH₃OH

C₂H₅OH

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Alkyl

Alkyl nitrile

Cyanogens

Amine

Which is not an enzyme

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Transverses

Lipase

Lyase

None of these

The formula of lime stone is

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CaCl₂

MgCO₃

Na₂CO₃

CaCO₃

The molarity of toluene solution in benzene is 0.22 if 5 grams of toluene dissolved, then mass of benzene is grams is

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267

260

240

247

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4-methyl pentene

2-methyle-1-butene

2-methyl propane

None of the above

One of the following bonds is polar but compound is non-polar

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H₂O

NH₃

HCl

CO₂

Which of the following yield both hydrogen and chlorine on electrolysis:

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Electrolysis of acidified water.

Electrolysis of molten NaCl

Electrolysis of aqueous NaCl

Electrolysis of saline water

Neutron was discovered by:

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Chadwick.

Bohr.

Rutherford.

Plank.

Polythene is a polymer of

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Ethane

Ethene

Acetone

Propylene

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The ionization energy of A is high and electron affinity of B is low

The ionization energy of A is low and electron affinity of B is high

Both the ionization energy of A and electron off affinity of B are high

Both the ionization energy of A and electron affinity of B are low

The pH of the rain water in areas where acid rain is the cause of pollution may be

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6.5

5.6

4.5

2.2

Alkali metals in each period have

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Smallest size

Lowest IE

Highest IE

Highest electronegativity

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RCH(CH₃)CO₂H + CH₃OH

RCH(CH₃)CO₂H + HCO₂H

RCH(CH₃)OH + CO₂

RCH(CH₃)OH + HCO₂H

Which orbital is in the process of completion in case of transition elements

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p-orbital

f-orbital

d-orbital

s-orbital

The fourth period contains elements

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8

16

18

32

The monomeric units of starch is/are

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Glucose

Fructose

Glucose and fructose

Mannose

Who gave the concept of atomic number

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Newton

Mosley

Dalton

Newland

Sodium hexametaphophate is known as

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Calgon

Permutite

Natalite

Nitrolim

In a group form top to bottom, the hardness of alkali metals

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Remains unchanged

Increases

Decreases

None

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