Question # 1

Coenzymes are the species which increase the activity of enzymes. They are chemically

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Metal ions

non-metals

Organic acids

Organic bases

The values of ∆H for the process l(g)+e-1--------->
I-1(g) is:

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>0

<0

0

None

Which one of the following is used as coagulant for purification potable water:

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copper sulphate

alum

barium

nicket sulphate

Baever's reagent is misture of

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HCI& ZnCl

Ageous bromine

Alkaline KMn4

Mix of Br2&KMnO4

The fibre which is made from vinylidine chloride polymer is called

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rayon fibre

azlon fibre

acetate fibre

all of the above

_{What is name of hydrated variety of quartz?}

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Rose quartz

Smokey quartz

Silica

Opal

Solid waster of the city is disposed off by dumping in a landfill. Which of the following gas is produced in the landfill

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Oxygen

Chlorine

Hydrogen sulphide

Hydrogen chloride gas

Which of the following are more temperature senesitive

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Liquid crystals

Solid crystals

Ionic stals

None of above

Which of the following alcohol cannot be produced by treatment of aldehydes or ketones with NaBH4

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I-propanol

2-Methyl-2-propanol

2-propanol

Ethanol

Vegetables oils are

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Unsaturated fatty acids

Glycerides of unsaturated fatty acids

Glycerides of saturated fatty acids

Essential oils obtained from plants

Haemoglobin molecule is how many times heavier than helium atom

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68000 times

17000 times

,34000 times

, 1700 times

Phosphide ion has the electronic structure similar to that of

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Nitride ion

Fluoride ion

Sodium ion

Chloride ion

Solvent extraction method is a particularly useful technique of separation when the product to be separated is:

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non-volatile or thermally unstable.

volatile or thermally stable.

non-volatile or thermally stable.

volatile or thermally unstable.

Which of the following compound is no formed according to octet rule:

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KrF₂

XeF₂

XeO₃

SF₆

Factors affecting denaturation of proteins:

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Change in temp and pH

Strong reducing agent

Strong oxidizing agent

All of these

Which of the following species has unpaired electrons in antibonding molecular orbitals

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Which one is not a pollutant normally?

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Hydrocarbons

Carbon dioxide

Carbon monoxide

Sulphur dioxide

The ionization potential is lowest for the

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Halogens

Inert gases

Alkaline earth metals

Alkali metals

The oxides of which of the following elements will be acidic in character

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Mg

Rb

Li

Cl

N₂3H₂⇌ 2NH₃

_{Which of the following change will favorthe formation of more}NH₃at equilibrium in above reaction :

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By adding NH_3.

By removingH_2.

By decreasing pressure.

By increasing pressure.

Which of the following is a nucleophile

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OH

CH(CH₃)₃

CH₃⁺

CH₃CH₂CH₃

Treatment of a secondary alcohol with a suitable oxidizing agent (K₂Cr₂O₇) results in the formation of

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Ketone

Aidehyde

Ether

Alkyl halide

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