Question # 1

The freezing point of 1 molal NaCl solution assuming NaCl to be 100% dissociated in water in

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-1.86°C

-3.72°C

+1.86°C

+3.72°C

K_avalue of HF acid is 6.7 x 10^-15the acid is a

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Weak acid

Moderately strong acid

Strong acid

Very weak acid

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Moles^-2dm⁺⁶

No units

Mole dm^-3

Mole^-1dm^-3

The factor which effect the rate of reaction

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Nature of reactants

Surface area

Light

All of the above

Sometimes a yellow turbidity appears while passing H₂S gas even in the absence of II group radicals. This is because

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Sulphur is present in the mixture as impurity

IV group radicals are precipitated as sulphides

Of the oxidation of H₂S gas by some acid radicals

III group radicals are precipitated as hydroxides

The bond order O₂molecule is

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1

2

3

Zero

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Linear geometry is present in:

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Sp³

Sp²

Sp

D²sp³

DDT is

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Biodegradable pollutant

Nondegradable pollutant

Not a pollutant

An antibiotic

Which of the following has ester linkage?

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Nylon

Bakelite

Terylene

PVC

When the rate of formation of reactants is equal to the rate of formation of products, this is known as

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Chemical reaction

Chemical equilibrium

Chemical kinetics

None

Which of the substances Na, Hg, S Pt and graphite can be used as electrodes in electrolytic cells having aqueous solution?

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Na, Pt and graphite

Na and Hg

Pt and graphite only

Na and S only

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Aqueous bromine

Dilute HNO₃

Dilute HCI

CH₃COCI

Which is possible in ethers?

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Reactivity high

Oxidation and reduction

Reactivity towards bases

Towards acids

Which nitrogen fertilizer is favoured in tropical regions because of its-hygroscopic nature

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Ammonium sulphate

Ammonium nitrate

Ammonium chloride

Ammonium phosphate

Generally the bond formed by metals with non-metals is

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Ionic

Covalent

Polar

Non- polar

The bibre which is composed of at least 85% by weight of acrylonitrile is known as

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Royan fibre

Azlon fibre

Saran binre

Acrylic fibre

Al³⁺is a symbol for aluminium

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Atom

Ion

Cation

Anion

Solubility of KMnO₄at higher temperature is:

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5%

7%

15%

25%

Which of the following molecules have multiple bonds

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CH₄

C₂H₄

C₂H₆

CCI₄

Equal volumes of 0.1 M AgNO₃and 0.2 M NaCl are mixed. The concentration of NO^-₃ions in the mixture will be

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0.1 M

0.05 M

0.2 M

0.15 M

The wave number of the line emitted is 109.678 x 10⁵m^-1in the Lyman series when electron transition occurs

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Amino acids are buildng blocks of:

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protein

Carbohydrates

Lipids

fats

Acyl halide is formed by reacting PCl₅with

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Alcohol

Ester

Amide

Both carboxylic acids as well as esters

Derivative of water is:

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Alcohals

Phenols

Either

Phenol

At room temperature formaldehyde is

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Gas

Liquid

Solid

None of the above

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N₂O₄is limiting reactant

N₂H₄is the limiting reactant

Reactants are completely converted to the products

Reactions is reversible

The pH of 10^-3mole dm^-3of an aqueous solution of H₂SO₄is

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3.0

2.7

2.0

1.5

In a group the atomic size increase downward due to

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Addition of electronic shells

Increase in the proton number

Repulsion of electrons

All of the above

Which one does not declourized KMnO₄

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Alkenes

Alkynes

Bezene

All above

Which is independent of temperature

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Molarity

Molality

Normality

Mole fraction

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