Question # 1

Covalent solids are composed of

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Ions

Different molecules

Neutral atoms

Diethyl ether

Which pair of molecules have debye force

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Ne and Ne

Argon and water

Na⁺ion and water

Water and water

Which is the optimum temperature for the activity of enzyme

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20 - 35°C

10 - 15°C

55 - 70°C

35 - 55°C

If Cl2 is passed through hot NaOH. NaCIO3 is formed and the oxidation number of CI changes from

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-1 to 0

0 to +5

0 to-1

0 to +1

On hydrolysis sucrose gives

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Glucose and maltose

Fructose and lactose

Fructose and maltose

Glucose and fructose

Which of the following is the element not present in all proteins

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Carbon

Hydrogen

Nitrogen

Sulphur

Example of non-protein amino acid

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Alanine

Citrulline

Phenylalanine

Leucine

Phosphorus is very useful in the growth of:

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leave

stem

seed

root

Carboxylic acid can be prepared from the reaction of Grigard's reagent with:

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Aldehydes

Ketones

Formaldehyde

CO₂

The relative rates of diffusion of a gas (Mol.wt.=98) as compared to hydrogen will be

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1/7

1/5

1/4

1

Which one of the following statements about sodium chloride is incorrect?

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it has a high melting point

it conducts electricity at room temperature

it is soluble in water

it is brittle

Freezing point depression is measured by

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Beckmann's apparatus

Lands Berger's method

Antifreeze apparatus

All of the above

Dilatometric method is used for rate determination when

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Reactions involving change of optical

Reactions involving change of optical activity

Reactions involving small volume change

None of above

What is the packet of energy called?

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Electron

Photon

Positron

Proton

When the rate of formation of reactants is equal to the rate of formation of products, this is known as

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Chemical reaction

Chemical equilibrium

Chemical kinetics

None

95% ethanol is called :

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Rectified ether.

Diesel.

Rectified spirit.

Petrol.

The electron in an atom

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moves randomly around the nucleus

has fixed space around the nucleus

is stationary in various energy levels

moves around its nucleus in definite energy levels

Which is a mixture of low boiling hydrocarbon

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Natural gas

Petroleum

Wood

Graphite

Crystalline form of sulphur stable at room temperature is

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Rhombic sulphur

Monoclinic sulphur

Plastic sulphur

Prismatic sulphur

Azeotropic mixture of HCl and water has

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48% HCl

22.2% HCl

36% HCl

20.2% HCl

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Zero

1

2

1.5

Sodium forms largely

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Normal oxides

Per-oxides

Superoxides

None of these

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