Question # 1

In water the most important oxidizing agent is dissolved molecular oxygen which ranges form

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2 - 4 ppm

4 - 6 ppm

2 - 5 ppm

4 - 8 ppm

A mixture of H₂, H2 and CH₄has total number of 0.51 mole and total pressure of 1 atmosphere. If the mass of H₂is 0.8 gram, then its partial pressure is

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0.4 atm

0.6 atm

0.776 atm

0.667 atm

If volume of an ideal gas at 0°C 536cm3, what is volume at 1°C

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373 cm3

646 cm3

Becomes 0cm3

746 cm3

Setting process of cement is based on:

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Hydrolysis

Dehydration

Hydration

Oxidation

Starch is a polymer of

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Sucrose

Fructose

α-D-Glucose

Lactose

Cellulose is formed from

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D-galactose units

50% of D-glucose and 50% of L-glucose units

L-glucose units

D-glucose units

The most suitable temperature for preparing ammonia gas is

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250℃

450℃

350℃

550℃

The carbon atom of an alkyl group attached with halogen atom is called

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Electrophile

Free redical

Nucleophile

Nucleophilic centre

Which of the following statements about amorphous solids is incorrect?

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They melt over a range of temperature

They are anisotropic

There is no orderly arrangement of particles

They are rigid and icompressible

A graph between P and 1/V at constant temperature and number of moles of a gas meets the:

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Y-axis

X-axis

Origin

None of above

Which one of the following is a disaccharide?

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glucose

sucrose

fructose

starch

When metallic sodium in ether is heated with ethyl chloride, which alkane is formed

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Propane

Ethane

Iso-butane

N-butane

Neutrons was discovered by

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Mosely

Milliken

Chadwick

Ruherford

Half life period of N₂O₅is 24 minutes and it remains same where we increase or decrease its initial concentration, then reactions

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Zero order

First order

Second order

Third order

Equal volumes of ethylene glycol (molar mass = 62) and water (molar mass = 18) are mixed. The depression in freezing point of water is (given K_rof water = 1.86 K mol^-1kg and specific gravity of ethylene glycol is 1.11)

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0.003

3.33

0.333

33.3

The simplest separating unit of a polymer is called:

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Monomer

Dimer

Trimmer

Macromer

Internal energy of a system is equal to

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Kinetic energy of particles

Potential energy due to binding forces between particles

Sum of kinetic energy plus potential energy of the particles

Heat contents

Ethyl alcohol may be identified by

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Ring test

Iodoform test

Tollen's test

Bazeyer's test

Vitamin A is present in

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Liver

Milk

Green vegetables

All

Which one of the following statement is wrong regarding differences between aldehydes and ketones

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Aldehydes undergo reduction to form primary alcohols while ketones undergo reduction to form secondary alcohols

Aldehydes undergo oxidation to form acids having less number of carbon atoms while ketones undergo oxidation to form acids having same number of carbon atoms

Aldehydes give positive silver mirror test while ketones give negative -mirror test

Aldehydes can undergo polymerization while ketones cannot undergo polymerizarion

The solubility of a gas in water depends upon

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Nature of the gas

Temperature

Pressure of the gas

All of the above

A molecule of haemoglobin is made up if nearly

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10,000 atoms

50,000 atoms

2500 atoms

1500 atoms

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