Question # 1

Gases are good conductor of electricity at

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Low temperature

Low pressure

High pressure

Low temperature and high pressure

Total number of valence electrons in phosphonium ion (PH4-) is

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8

9

12

10

Coinage metals Cu, Ag and Au are the least reactive because they have

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Negative reduction potential

Negative oxidation potential

Positive reduction potential

Positive oxidation potential

The dehydration of ethyl alcohol with concentrated H2SO4 at 140°C gives

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Ethene

Alcohol

Diethyl ether

Carboxylic acid

If internal energy of the system is increased

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Change in state of the system may occur

Temperature of the system may rise

Chemical reaction may take place

All of these

Hydrogen has a = 0.245 atm. dm³. mole^-2and b = 0.0266 dm³. mole^-1SO₂gas has a = 6.170 atm. dm³mole^-2and b = 0.0564 dm³mole where a and b are Van der Waal's constant

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H₂gas deviates more from ideal behaviour tha SO₂

SO₂gas deviates more form ideal behaviour than H₂

both deviate from ideal behaviour equality

both are ideal gases

Which woody raw material is used for the manufacture of paper pulp?

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cotton

bagasse

poplar

rice staw

Which is the example of diffusion of gases

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bubbling in soda bottle

vapour condensing on a moist surface

hot air rising above a candle

spreading of smell from a scent bottle

Which process of ester will yield carboxylic acid?

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Hydration

Hydrolysis

Oxidation

Reduction

The number of atoms or molecules whose concentrations determines the rate of a chemical reaction is called the

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Molecularity of the reaction

specific activity of the reaction

Order of the reaction

rate constant of the reaction

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

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Carbon

Hydrogen

Nitrogen

Sulphur

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-778.9 KJ

788.0 KJ

-1.9 KJ

+1.9 KJ

Coal contains sulphur in it :

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1 - 3%

1 - 6%

1 - 9 %

1 - 12%

Which property is not present in Al?

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Reacts with acid

Reacts with bases

Changes litmus paper

Changes methyle orange colour

Corrundam is ore of:

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Li

Be

B

Al

Methyl alcohol is not used

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As a solvent

A an anti-freezing agent

As a substitute for petrol

For denaturing of ethyl alcohol

When alcohol reacts with concentreated H₂SO₄intermediate compound formed as

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carbonium ion

alkoxy ion

alkyl hydrogen sulphate

non of these

While balancing an equation by ion electron method, the number of oxygen atoms are balanced by

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OH^-

H₂O

O₂

H⁺

The carbon, carbon bond length in benzene is

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1.54A°

1.34A°

1.20A°

1.39A°

Peptide bond is a key feature in

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Polysaccharide

Proteins

Nucleotide

Vitamins

Which of the following is not true for metalloids

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They are borderline elements that exhibit both metallic and non-metallic properties to some extent

They usually act as electron donors with non-metals and as electron acceptors with metals

Some of these elements are boron, silicon and germanium

They are good conductors of heat and electricity

Indicate the correct statement

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All lanthanidees are present in the same group

All halogens are present in the same period

All the alkali metals are present in the same group

All the noble gases are present int he same period

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