Question # 1

The concentration of dissolved molecular oxygen in water which acts as the most important oxidizing agent ranges from

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2 ppm - 6 ppm

2 ppm - 4 ppm

4 ppm - 8 ppm

2 ppm - 3 ppm

Which is not a calcareous material:

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Lime

Marble

Clay

Marine shel

Which element exists as discrete small molecules in the solids state

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Aluminum

Silicon

Iodine

Sodium

Choose a point which is not included in the components of environment:

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stratosphere

hydrosphere

lithosphere

biosphere

What are the conditions under which the relation between volume (V) and number of moles (n) of gas is plotted? (Pressure; T-temperature)

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constant P and T

constant P and V

constant T and V

constant n and v

Which of the following molecule has zero dipole moment?

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PCI3

BF3

NH3

H2O

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

The change in enthalpy of a system when one mole of the substance is completely burnt in excess of air or oxygen is called

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Heat of reaction

Heat of formation

Heat of atomization

Heat of combustion

Poly hydroxyl compounds of aldehyde and ketones are?

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Carbohydrates

Proteins

Fats

Lipids

Reaction kinetics is important to discover the---under which reaction will proceed most economically:

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rate constant

Conditions

volume

equilibrium point

Which is an intermediate in SN1 reaction

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Ethoxide ion

Carbocation

alkyl halide

alkene

Which of the following phosphorus is most reactive?

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Red phosphorus

White phosphorus

Scrlet phosphorus

Violet phosphorous

Which of the following oxides is peroxide?

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Na₂O₂

MnO₂

BaO

SO₂

Which of the following hydrides has the lowest boiling point?

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H₂O

H₂S

H₂S3

H₂Te

The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is

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Microwave > infrared > visible > ultraviolet

Visible > ultraviolet > microwave > infrared

Ultraviolet > visible > infrared > microwave

Infrared > microwave > ultraviolet > visible

The electrolysis of CuSO₄aqueous solution using copper as cathode as well an anode the substance which deposits at cathode is

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H₂SO₄

Oxygen

Copper

Hydrogen

Which of the following is the most suitable method for removing the traces of water from ethanol?

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Reacting with Na metal

Passing dry HCl through it

Distilling it

Reacting with Mg

Concentration of rectified spirit is:

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12%

14%

90%

95%

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Action of Zn with alkyl halides in the presence of an inert solvent forms higher alkanes. This reaction is known as

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Wurtz reaction

Frankland's reaction

Cannizaro reaction

Kalobe's reaction

For which system does the equilibrium constant. K_chas units of

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Molecules of High molecular weight usually greater than 10,000 are called:

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Macro molecules

Mega molecules

Poly molecules

Gega molecules

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