Question # 1

Which is correct?

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1 mm Hg = 1 torr = 1 atm

1 mm Hg = 760 torr = 1 atm

760 mm Hg = 760 torr = 1 atm

760 mm Hg = 1 torr = 1 atm

At what temperature, would N₂molecules have the same average speed as He-molecules at 300 k?

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1100 K

2100 K

420 K

None

The height of the peak in the mass spectrum shows

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Number of isotopes

Relative abundance

Mass number

Number of protons

Rancidification of fast and oils is due to:

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hydrolysis reaction

oxidation reaction

both a and b

hydrogenation reaction

Acetylide can give back ethyne upon treatment with

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water

strong base

dil. Acid

weak base

Honey contains glucose and fructose along with some other ingredients. It has greater viscosity due to:

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irregular shape of the molecules

greater molecular size and strong intermolecular forces

H-bonding

irregular shape of the molecules

The development of industries was a direct result of which major factor

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population

living standards

depletion of resources

all of these

Optimum PH for enzyme pepsin is

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01

2

05

6.5

The fertilizer contains 33___35%n is:

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ammonium nitrate

potassium nitrate

urea

ammonia

The addition compound obtained by reacting acetaldelyde and HCN, when Iydrolyzed gives

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Ethyl alcohol

Methyl cyanide

2-Hydroxy propanoic acid

Ethyl cyanide

The total number of 3d-series transition elements is

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10

40

14

58

Which of these polymers is a synthetic polymer?

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Animal fat

Starch

Cellulose

Polyester

The valence orbital configuration of an element with atomic number 23 is

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3d⁵

3d³, 4s²

3d³, 4s¹, 4p¹

3d²,4s²,4p¹

Ketones are prepared by the oxidation of:

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Primary alcohol

Secondary alcohol

Tertiary alcohol

None of these

Grignard reagent on reaction with a ketone forms

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Tertiary alcohol

Secondary alcohol

Primary alcohol

Carboxylic acid

Which class of compound is more reactive

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Alkane

Alkene

Alkyne

None

Pick up the correct statement

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CO which is major pollutant resulting from the combustion of fuels in automobile plays a major role in photochemical smog

Classical smog has an oxidizing character while the phtochemical smog is reducing in character

Photochemical smog occurs in day time whereas the classical smog occurs in early morning hours

During formation of smog the level of ozone in the atmosphere goes down

A state function of the system which describes together the internal energy and the work done is called

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Enthaply

Internal energy

Work

Free energy

Purines include

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Adenine

Guanine

Both a and b

None

The filtration process is used to separate solid from

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Liquid

Gas

Solid

All of above

Sodium forms largely

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Normal oxides

Per-oxides

Superoxides

None of these

Iodine value of an oil or fat may be defined as

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The number of grams of iodine taken up by 1 g of the oil or fat

The number of grams of iodine taken by 10 g of the oil or fat

The number of grams of iodine taken by 100 g of the oil or fat

None of the above

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