Question # 1

Corrosion may be prevented by

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Allcying

Paints

Metallic coatings

All

Outer shells of two elements X and Y have two and six electrons respectively. If they combine, the expected formula of compound will be

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XY

X₂Y

X₂Y₃

XY₂

The melting point is lowest for

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Be

Mg

Ca

Sr

Carbolic acid is the other name for

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Methanol

Ethanol

Propanol

Phenol

With amino acids ninhydrin solution gives

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Blue

Violet

Bluish violet

White

A smuggler could not carry gold by chemically depositing iron on the gold surface since

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Gold is denser

Iron rusts

Gold has higher reduction potential then iron

Gold has lower reduction potential then iron

Property of transition element is :

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Low m.p and b.p

Parramagnetism

Oxidation state

Low binding energies

Select from the following the one which alcohol

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Alkyl halides on treatment with Zn and HCI gives

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Alkanes

Alkenes

Alkynes

Alcohols

CFCs undergo homolytic fission by uv light in the stratosphere which radical could result from this irradiations of CHCICF₂Cl.

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CHF Cl C FCl

CH Cl CF₂Cl

CHF CF₂Cl

C FCl CF₂Cl

Chromic acid used to oxidize

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Aldehyde

Ketone

Both a and b

None of these

Which of the following is produced when an aqueous solution of butan-2-ol is refluxed with dil acidified KMnO₄

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Butanol

Butanoic acid

Butanone

Butane

Which of the following is not related to transition metals

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They have a high tensile strength

They are ductile

They are malleable

They have low melting points

Gasoline is a mixture of hydrocarbons containing carbon atoms

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5 to 10

5 to 8

5 to 12

5 to 11

Complex protein molecules which catalyses the organic reactions in the living cells are called

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Living organisms

Enzymes

Viruses

Bacteria

Turnbull's blue is a compound called?

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Ferricyanide

Ferrous ferricyanide

Ferrous cyanide

Ferri - Ferro cyanide

95% alcohol is called

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Rectified spirit

Spirit of wine

Spirit

Methylated

______ gives peroxide

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Li

Ba

Sr

Be

The atomic number of an element is 35 what is the total number of electrons present in all the p-orbitals of the ground state atom of that element?

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6

11

17

23

The volume of 0.1 M H₂SO₄required to neutralize completely 40 ml of 0.2 M NaOH solution is

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10 ml

40 ml

20 ml

50 ml

The distillation of coal at high temperature and in absence of air is called

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Vacuum distillation

Normal distillation

Fractional distillation

Destructive distillation

On adding sodium nitroprusside ketones give

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Red

Wine red

White

Orange

What is the cause of water pollution

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Chemical and bacterial contents in live stock

The spilled oil in rivers and ponds

Wide spread use of pesticides

All of the above

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1st order

2nd order

Zero order

3rd order

The elimination of hydrogen halide from adjacent carbon atoms is called

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Dehydrogenation

Hydrogenation

Dehydrohalogenation

Hydrohalogenation

Hybridization in alkanes is:

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sp

sp²

sp³

dsp²

Two H-atom combine to form a strong H₂molecule due to

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Increase in potential energy

Decrease in potential energy

Energy remains unchanged

Distance is increased

Ascorbic acid contains 40.92% carbon, 4.58%, hydrogen and 54.4% oxygen. The empirical formula is

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C₃H₄O₃

C₂H₄O₃

C₃H₅O₄

C₂H₃O₁

Hydrolysis of Grignard's reagent yields

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Alcohol

Aldyhyde

Ester

Alkane

The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is

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6.63 x 10^-33m

6.63 x 10^-34m

6.63 x 10^-35m

6.65 x 10^-35m

Which of the following is a typical transition metal?

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Sc

Y

Ra

Co

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