Question # 1

The elements like calcium nitrogen and phosphorus added into the soil in large amounts are called:

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basic elements

trace elements

additives

nutrient element

250cm of 0.2 molar potassium sulphate solution is mixed with 250cm of 0.2 molar KCI solution. The molar concentration of K ions is:

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0.2 molar

0.25 molar

0.3 molar

0.35 molar

Which alcohol is most reactive towards sodium metal?

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Ter Butyl alcohol

n-Propyl alcolol

Isopropyl alcohol

Have same reactivity

Oxides of sulphur react in atmosphere by various reactions to form:

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sulphates

sulphites

sulphides

sulphate aerosols

Which one of the following alcohol is indicated by formation of yellow crystals in lodoform tesr?

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Methanol

Ethanol

Butanol

Propanol

The molar volume of CO₂ is maximum at:

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S.T.P. (0^∘C and 1 atm)

127^∘C and 1 atm

0^∘C and 2 atm

273^∘C 2atm

NH₃shows a maximum boiling point among the hydrides of Vth group elements due to

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very small size of nitrogen

hydrogen bonding between its molecules

enhanced electronegative character of nitrogen

pyramidal structure of NH₃

Formic acid is obtained from red out by:

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Distillation

Crystallization

Filtration

Sublimation

A combination of glucose and fructose is called

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sucrose

table sugar

a & b

Lactose

Coordination number of Zn and ZnS (Zinc blends) is

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4

6

2

None of these

The material possessing superconducting properties is

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Yb Ba₂ Cu₂ O₈

Hg Be₂ Ca₂ Cu₂ O₈

Y Ba₂ Cu₃ O₇

Y B₂ Cu₃ O₇

The difference between amount of heat actually released and that of calculated is called

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Bonding energy

Activation energy

Resonance energy

Transition energy

The elements in which d or f-orbitals are incomplete are called

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Transition elements

Typical elements

Actinides

lanthanides

Glacial acetic acid freezes to ice like solid at (°C)

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07

17

27

37

Heat,. work and internal energy of the system and surroundings are related into an equation which is called

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First law of thermodynamics

Hess's law

Henry's law

Born-haber cycle

Which of the following molecules have multiple bonds

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CH₄

C₂H₄

C₂H₆

CCI₄

Benzene was discovered by Michael Faraday's in

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1824

1825

1826

1827

SN₂reaction has order of reaction :

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First

Second

Third

Zero

UV radiations bring about

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Skin cancer

Mouth cancer

Lung cancer

Liver cancer

The bond angle between hydrogen atoms and carbon in alkane is

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104.5°

107.5°

109.5°

120.5°

The reaction between primary amine-chloroform and alcoholic caustic potash is called

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Wurtz reaction

Frankland reaction

Cannizzaro's reaction

Carbylamine reaction

2-Bromopentane is heated with potassium ethoxide in ethanol . The major product obtained is

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2-Ethoxypentane

Pent-1-ene

cis-Pent-2-ene

trans-Pent-2-ene

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