Question # 1

One dm³of O₂at STP has mass

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32 g

16 g

4.438 g

1.4383 g

At equilibrium rate of evaporation and rate of condensation

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Become very high

Become very low

Become equal

Can never be equal

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

How much quantity of total water is available as fresh water

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3%

1%

10%

21%

The height of the peak in the mass spectrum shows

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Number of isotopes

Relative abundance

Mass number

Number of protons

Which of the following factors is not used to determine the quality of water

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COD

BOD

DO

Available chlorine

Highest oxidation state af the transition elements is

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+8

+7

+5

+1

SO₂produced by volcanoes is about

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75%

67%

69%

70%

Albumins and globulins are defined as

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Derived protein

Conjugated protein

Fibrous protein

Globular protein

Which af the following compound reacts slower than benzene in the electrophilic substitution.

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Phenol

Nitrobenzene

Toluene

Aniline

The Complete oxidation of ethanol produces first Ethanal than

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Ethanal

Propanone

Ethanoic acid

Benzoic acid

The reaction of sodium with ethanol gives

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CH₃OH

NaH

H₂O

H₂

If an electrophile attacks then ______ bond breaks first

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C - H

O - H

C - O

None of these

Which of the following compounds gives red precipitate with AgNO₃?

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Kl

K₂CrO₄

NaBr

NaNO₃

To determine the rate of reaction chemically a graphical method is applied. A graph is plotted between the amount or reactant decomposed or product formed against the time. The rate d_x/d_tat any time is equal to

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k

Tangentθ

1/a, a is initial conc.

1/a²

Ethyl alcohol reacts with acetyl chloride to form

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Ethyl chloride

Acetic acid

Methyleacetate

Ethyleacetate

Which of the following element is responsible for oxidation of water to O₂in biological process?

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Fe

Mn

Cu

Mo

Which of the following is used as anesthetics

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Alcohol

Diethylether

Phenol

Dimethyl ether

Which of these polymers is an addition polymer?

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Nylon-6,6

Polystrene

Terylene

Epoxy resin

Hydrocarbans, SO₂, CO, NH₃, nitrogen oxides and compounds of fluorine are called

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Primary pollutant

Secondary pollutant

Tertiary pollutant

None of these

Solvent extraction is an unstable,Process and it is controlled by:

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Alcohol extraction

Petrol extraction

Phenol extraction

Ether extraction

Absolute alcohol is obtained by adding rectified apirit in alcohol:

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Water

Na₂CO₃

NaOH

CaO

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