Question # 1

When a colourless gas is passed through bromine water only decolourisation takes place the gas is

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SO₂

HBR

HCl

H₂S

During electrolysis of KNO₃, H₂is evolved

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Anode

Cathode

Both a and b

None

What happens when CCl₄is treated with AgNO₃solution?

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NO₂will be evolved

A white ppt. of AgCl will form

CCl₄will dissolve in AgNO₃solution

Nothing will happen

The atomic radius of hydrogen is 37

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Pecometer

Manometer

Angstrom

Micrometer

Which is not the form of silica?

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Amethyst quatz

Rose quatz

Smoky

None of these

If Grignard reagent is allowed to react with another alkyl halide the main product is

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An alkane

Cyclo alkane

Alkyne

An alkene

Which is not interstitial hydride

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LaH

VH

TaH

None

Lithium reacts with air to form

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Peroxide

Normal oxide

Superoxide

None of these

Coal is used to bake bricks in lime kiln:

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40%

60%

80%

None of these

Which of the following molecules have multiple bonds

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CH₄

C₂H₄

C₂H₆

CCI₄

Dehydration of an alcohol at 180°

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Alkene

Ether

Ester

An hydride

The fourth period contains elements

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8

16

18

32

CuSO₄. 5H₂O is used to prepare

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Transition complex

Fehling's 'A' sol

Fehling's 'B' sol

Fehling's sol

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4-methyl pentene

2-methyle-1-butene

2-methyl propane

None of the above

The pH of the rain water in areas where acid rain is the cause of pollution may be

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6.5

5.6

4.5

2.2

The formation of compounds like PF₅, BCI₃, SF₆indicates that

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These halides are ionic

These halides are covalent

They are Lewis acids

Octet rule not obeyed so the rule is not universal

Which is independent of temperature

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Molarity

Molality

Normality

Mole fraction

Which has the largest radius?

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CO³⁺

Mn³⁺

Fe³⁺

Cr³⁺

The reagent which forms crystalline osazone derivative when treated with glucose is

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Fehling solution

Phenyl hydrazine

Benedict solution

Hydroxyl amine

Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg toxic

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It attaches to sulphur of the disulphide link

Hg is a heavy metal

Hg is liquid at room temperature

Hg is non reactive chemically

Two moles of HI was heated in a sealed tube at 440°C till the equilibrium was reached. HI was found to be 22% decomposed. The equilibrium constant for dissociation is

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0.282

0.0796

0.0199

1.99

Which of the following process is employed to convert alkyl halide into alcohol?

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Addition

Substitution

Dehydrohalogenation

Molecular rearrangement

Grignard reagent on reaction with a ketone forms

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Tertiary alcohol

Secondary alcohol

Primary alcohol

Carboxylic acid

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HF is stable and does not decompose even at 2000°C

HF is stable and slowly decomposes at 2000°C

HF is strong acid

HF produces equal moles of hydrogen and fluorine

Activity of the enzyme is reduced by

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Temperature

Concentration

pH

Inhibitors

Which one of the following elements is not present in all proteins

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Carbon

Hydrogen

Nitrogen

Sulphur

The temperature at which the vapour pressure of a liquid becomes equal to external pressure is

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Melting point

Sublimation point

Inversion point

Boiling point

Carboxyl compounds have functional group:

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R-C-X

R-CH=O

RCOR

All

Th IUPAC name of the compound having formula (CH3) 3 C - CH = CH2 is

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1, 1-Dimethyl-3-butene

1,1,1-Trimethyl-3-propene

3,3,-Dimenthyl-1-butene

3,3,3,-Trimethyl-1-propene

Which of the following does not give iodoform test?

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Ethanol

Ethanal

Acetophenone

Bezophenone

An organic compound will decolorise dill acidified (aq) KMnO₄on warming, but will not decolorise bromine water. What is the compound

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KMnO₄

Ethanol

Ethane

CH₃CH₂Cl

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