Question # 1

A mixture containing S2- and SO4 ions on trating with dil HCl will produce

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H2S gas

SO2 gas

H2S and SO2 gas

CO

The rusting of iron is catalysed by which of the following.

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Fe

O2

Zn

H+

Which of the following hydroxide is amphoteric.

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B(OH)3

Al(OH)3

Ga (OH)3

In (OH)3

Which of the following solids is a better conductor of electricity.

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Pore NaCl cyrstal

Diamond

Graphite

Marble pieces

A covalent bond which is formed between two atoms by the overlap of atomic orbitals along their axis is called.

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Pi bond

Sigma bond

Polar bond

Non polar bond

Helium contents in the atmosphere by volume.

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0.0005%

0.0015%

0.0001%

0.00001%

A chemical reaction resulting in a change in the electric charge on the reacting particles may be called as.

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Add ion reaction

Redox reaction

Elimination reaction

Chain reaction

Which of the following quantity is correct for micro analysis.

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1 -10 mg or < 50 ml

10-20 mg or > 50 mL

50-100 mg or < 100 mL

None of above

Which of the following pairs shows diagonal relationship

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Li and Mg

Na and K

Zn and Cd

Li and BE

Rectified spirit obtained by formentation contains 5% of water .So in order to remove it, rectified spirit is mixed with suitable quantity of benzene and heated Benzene helps because.

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It is dehydreating agent and so removes water

It forms the loweer layer which retains all the water so that alcohol can be distilled off

It form an azeotropic mixture having high boiling point and thus allows the alcohol to distall over

It forms low boiling azeotropic mixture which distille over leaving behind pure alcohol which can than be distilled.

Which of the following sulphide is yellow in colour.

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HgS

PbS

CdS

SnS

Which of the following species has highest bond energy.

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H2

T2

D

Cl

1-Butyne on oxymereuration -demercuration would give.

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Butanone

Butanal

Propanol and methanol

Propanoic acid and formic acid

The key element to be considered when evaluating a health hazard is.

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The amount of material the employee is exposed.

The total time of exposure

The toxicity of the substance

All above

When two H atoms approach each other then forces operates.

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Attractive forces

Repulaive forces

Attractive and repulsive

None of above

Carbon dioxide content in atmosphere is

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0.0034%

0.034 %

0.34 %

3.4 %

The aluminium salt commonly used to stop bleeding is

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Aluminium sulphate

Potash Alum

Aluminium chloride

Aluminium fluroide

Orion is polymer of.

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Styrene

CF2 = CF2

Vinyl chloride

Acrylontrile

H-Bonding also ox in ling system like

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Protein

DNA

Botha A and B

None of above

Which of the following statements not correct with the concept of Bronsted concept of acids and bases.

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An acid can donate a proton

A base can accept a proton

This concept has many bases that have OH- ions

This concept is more general

The principle former of almost all glasses is

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(SIO2)n

(SiO3)n

(SiO2)

None of these

Which of the following is domain of industrial ecology.

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The materials extractor

The materials processor

The consumer

All of above

The number of phases of mixtures of four gases enclosed in a container is

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1

4

4-1

zero

Has the highest value of electronegativity

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F

Cl

Br

I

A stable molecule is a group of atoms held together by

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Chemical forces

Physical forces

Valence force

None of above

Which of the following devoice is used to measure potential difference between celctrodes.

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Polarimetre

Conductometer

Voltmeter

Photometer

The molarity of a 500 mL solution containing 4 g NaOH

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0.1

0.2

0.3

0.4

Which of the following is not an organic precipitating agent.

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Diemethglyoxime

Cuperon

Oxime

Acetate

Identify the incorrect statement regarding crystallization from the following.

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It is an important procedure for purifying solids

The impurities are removed by filtering the solution

Crystals are separated by filtration

In crystallization method, the solid is dissolved in a solvvent in which it is soluble at all temperature.

The alpha iron will become paramagnetic at temperature above

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770 C

550 C

660 C

440 C

The designation of an orbital with n =4 and l = 1 in

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4 s

4 p

4 d

4 f

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