Question # 1

Time required to deposit one millimole of aluminium metal by the passage of 9.65 amperes through molten electrolyte containing aluminium ion is

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30 s

10 s

30,000 s

10,000 s

Which compound will not dissolve in H₂O

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C₆H₆

C₂H₅OH

CH₃CH₂CH₂OH

CH₃- OH

Which of these polymers is an addition polymer

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Nylon 6,6

Polystyrene

Terylene

Epoxy resin

Which of the following gases is used for illuminating purpose?

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Methane

Ethane

Propane

Butane

CnH_2nis the general formula of

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Alkanes

alkynes

None of above

Corrosion may be prevented by

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Allcying

Paints

Metallic coatings

All

Which of the following compounds could be prepared by reacting bromoethane with KCN and then reducing the product

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CH₃CH₃

CH₃CH₂NH₂

CH₃CH₂CH₂NH₂

CH₃CH₂CH₃

A common industrial solvent is a mixture of propanone; CH₃COCH₃, and pentyl ethanoate CH₃CO₂(CH₂)₄CH₃. Which reagent would have no effect on this solvent

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Na_(s)

NaBH₄

NaOH_(aq)

2,4-dinitrophenylhydrazine reagent

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Neutrons are attracted by nucleus

Neutrons carry out nuclear reactions

Neutrons carry no charge

Neutrons are electromagnetic radiations

Which of the following is a molecular diseases?

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Allergy

Cancer

German measles

Sickle cell anemia

The amount of Si in the lithosphere is about

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27.72%

30.35%

35.30%

40.21%

The oxyacids of phosphorus in which phosphorus has the lowest oxidiation state is

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Hypophosphorus acid

Orthophosphorus acid

Pyrophosphorus acid

Metaphosphorus acid

Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as

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Hund's rule

Heisenberg's principle

Paulit exclusion principle

Auf bau principle

Which of the following species has unpaired electrons in antibonding molecular orbitals

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When fused PbBr2 is electrolyzed :

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Lead appears at anode.

Lead appears at cathode.

Bromine appears at cathode.

Lead appears at both electrodes.

Which quantum number is sufficient to describe the electron is hydrogen atom?

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l

n

m

s

Any other aldehyde except formaldehyde on reaction with Grignard's will produce

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Secondary alcohol

Primary alcohol

Tertiary alcohol

Aromatic alcohol

Which one of the following step is not involved in determination of empirical formula

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Determination % of each element

Determination of gram atom of each element

Determination of isotopes of each element

Determination of atomic ratio of element

Tripple bond is present in

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O₂

H₂

N₂

Cl₂

Which of these polymers is a synthetic polymer?

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Animal fat

Starch

Cellulose

Polyester

The chemist who synthesized urea from ammonium cyanate was

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Berzelius

Kolbe

Wholer

Lavoisier

Which of the following element is most reactive

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Li

Na

K

Cs

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Primary alkyl halide

Secondary alkyl halide

Tertiary alkyl halide

None of these

Lead accumulator stops discharging current when

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Lead at anode converted to PbO₂

PbO₂at cathode converted to Pb

Both electrodes are completely covered with PbSO₄

Both electrodes are completely covered with Pb(OH)₂

The Mn³⁺has ______ color

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Violet

Green

Red/brown

No color

In zero order reaction, the rate is independent of :

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Temperature of reaction

Concentration ofreactants

Concentration of products

None of these.

Synthetic rubber is made by polymerization of

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Chloroform

Acetylene

Divinlacetylene

Butene

Which of the following compound is industrially prepared by the electrolysis of solution of NaCl

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Na₂CO₃

NaHCO3

NaOH

NaOCl

Activity of the enzyme is reduced by

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Temperature

Concentration

pH

Inhibitors

Amongst the following the compound that can be most readily sulphonated is

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Toluene

Benzene

Nitrobenzene

Chlorobenzene

The amount of heat required to convert one mole of solid directly into its vapour state at STP is called as

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Molar heat of vaporization

Standard heat of vaporization

Heat of reaction

Heat of neutralization

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