Question # 1

Which one of the following is used as coagulant for purification potable water:

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copper sulphate

alum

barium

nicket sulphate

The reaction of alkyl halide in the presence of alcoholic KOH is

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Substitution

Addition

Acid-base

Elimination

Digestion of carbohydrates begins in the:

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large intestine

small intestine

duuoderium

beccal cavity/mouth

Equal masses of CH₄and O₂are mixed in a 10 dm³container at 25°C. The partial pressures of CH₄and O₂are in the ratio of

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1 : 2

2 : 1

1 : 1

2 : 3

What is the formula of talc or soapstone?

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Na2B4O7.10H2O

H2Mg3(SiO3)4

Cu2S

NaNO3

The reaction between Cu and conc. H2SO4 produces

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Cu+2

SO₂

SO₃

H₂

Which set of elements is good loser of electrons

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F2. Cl2, Br2

N, P. As

O. S, Se

Li, Na, K

Ozone is present in layer around earth:

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atmosphere

tropospher

stratosphere

thermosphere

Ozone layer is high:

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20-23 km

22-25 km

23-26 km

25-28 km

Which alkaline earth metal makes peroxide?

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Ba

Be

Mg

Ca

Which of the following is addition polymerization

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PVA

Polystyrene

Both

None

Li, Be, B, C, O, Fl Ne are elements of

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Second period

First period

Third period

Fourth period

The colour of transition metal complexes is due to:

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d-d transitions of electorns

Paramagnetic nature of transition

Ionization

Loss of s-electrons

Major component in cement is :

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SiO₂

Lime

Al₂O₃

MgO

The radius of second Bohr's orbit is

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0.053 nm

0.053/4 nm

0.053 x 4 nm

0.053 x 20 nm

The energy absorbed when an electron is added to a gaseous atom to form a gaseous ion is called

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Electron affinity

Ionization energy

Both of these

None of these

Thre rate of S_N2 reaction depends upon the

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Concentration of alkyl halides

Concentration of nucleophile

Concentration of alkyl halides and nucleophile

None of the above

Which is not the form of silica?

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Amethyst quatz

Rose quatz

Smoky

None of these

The measurement of degree of disorder is

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Internal energy

Enthalpy

Entropy

None

Alkanes containing carbon C₁₈ownwards are

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Gases

Liquids

Waxy solids

Solids

Three sp²hybrid are co-planar at an angle of

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104.5°

109.5°

107°

120°

The iron obtained from blast furnace is

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Pig iron

Wrought ion

Soft ion

Steel

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