Question # 1

Lithosphere has amount of silicon

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35.30%

27.72%

40.01%

21.13%

Cyclone collector is used to reduce

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Noise pollution

Air pollution

Water pollution

Radioactive pollution

Polymerization process was classified in

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1926

1927

1929

1931

The kinetic energy of 4 moles of nitrogen gas at 127°C is? cals.(R = 2 cal mol^-1 K^-1)

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4400

3200

4800

1524

An element from the given below exists as discrete small molecules in the solid state. Which is that?

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Sodium

Silicon

lodine

lron

Compared with alkaline earth metals, the alkali metals exhibit.

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lower ionization energies

greater hardness

high boiling point

smaller ionic radii

Which of the following contains maximum of number of molecules?

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100 cc of CO₂ at STP

150 cc of N₂at STP

50 cc of SO₂ at STP

200 cc of NH₃ at STP

Electrons in 5d energy level are filled up in case of

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Lanthanides

Transition metals

Actinides

Rare gases

suppose that an ocean of mercury replaced all the air of the air of the earth . How deep would this ocean have to be to exert the same pressure as the air:

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77cm

76cm

79cm

78cm

How many zones through which the charge passes in a rotary kiln?

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4

3

2

5

Biochemical oxygen demand (BOD) is the capacity of organic matter in natural water to consume oxygen with in a period of:

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2 days

5 days

6 days

7 days

Which more acidic?

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o-cresol

p-nitrophenol

phenol

m-cresol

The number of de-electrons retained in Fe²⁺(At.No. of Fe = 26) ions is

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3

4

5

6

The heat of formation of graphite and P(white) is ______ KJ/mole

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0.00

-273.0

+8.7

813.99

Hydrolysis of Grignard's reagent yields

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Alcohol

Aldyhyde

Ester

Alkane

4-d series is in the period:

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4th

5th

6th

7th

The ratio of moles of a particular component of solution to total moles of all components of solution is :

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Mole fraction.

Molality.

Molarity.

Normality.

Which of the following is formed by the action of water on sodium peroxide?

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H₂

N₂

O₂

CO₂

In Friedal-Craft's alkylation besides AlCl3 the other reactants are

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C6H6 + NH3

C6H6 + NH4

C6H6 + CH3Cl

C6H6 + CH3COCl

Ethylene decolorizes cold dilute solution of KMnO₄. This test is known as

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Colouration test

Baeyer's test

Silver mirror test

Ring test

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Adding 2(ii) + 3(iii) and subtracting i

Add i + ii + iii

Add i - ii + iii

Add i - ii - iii

When the degree of freedom increase the entropy ______

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Decreases

Increases

Remains same

All

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