Question # 1

Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water

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low value

higher value

both values

none of these

During an exothermic or endothermic reaction which one of the following formula is used to calculate the amount of heat evolved or absorbed

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ΔΗ = ΔΕ+PV

∆E= q+w

Δp =ΔΗ

q = m x s x ∆T

What is the formula of magnesite?

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PbS

MgSO4. 7H2O

MgCO3

CaCO3

Which one of the followings is resistant to oxidation under normal conditions

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Methyl alcohol

Acetaldehyde

Ethyl alcohol

Acetone

Plastics are a pollution problem because many plastics:

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Are made from petroleum

Are very inflammable

Burn to produce toxic fumes

Decompose to produce toxic products

Daily protein intake for normal adults should be

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0.2 g/kg

0.5 g/kg

0.8 g/kg

1.1 g/kg

Hydrogen bonding is not present in which of following compound?

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Ammonia

Ethanol

Ether

Water

Denaturation of protein means the structure of protein is distrupted. indicate which factor does not denature protein

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heating protein

pH changes

oxidising agent

keeping pH 7.35

Air contains 78% N₂, 21% O₂ and 1% other gases at sea level the partial pressure of O₂ is

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760 torr

159 torr

592 torr

7.6 torr

In SO-²4 the oxidation number of sulphur is

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-8

-6

+8

+6

Lactic acid is buffered by

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L. Carnosine

Glutathione

Casenogin

Dopa

Aldehydes and ketones are carbonyl compounds. Which of them react both with NaBH₄and with Tollen's reagent

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Both aldehydes and ketones

Aldehydes only

Ketones only

Neither aldehydes nor ketones

Ionic hydrides are generally

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Liquid at room temperature

Good electrical conductors

Good reducing agents

Easily reduced

Major component of natural gas is:

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Ethane

Ethene

Propane

Methane

The chemical method used for determination of rate of reaction is

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Spectroscopic

Conductiometric

Refractometric

Titration

When CO₂is made to react with ethyl megnesium iodine, followed by hydrolysis, the product formed is:

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Propane

Propanoic acid

Propanal

Propanol

The sample being analyzed is called

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Electrolyte

Substance

Analyte

All of above

In a Galvanic cell

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Chemical energy is converted into electricity

Chemical energy is converted into heat

Electrical energy is converted into heat

Electrical energy is converted into chemical energy

For preparing an alkane, a concentrated aqueous solution of sodium or potassium salt of saturated carboxylic acid is subjected to

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Hydrolysis

Oxidation

Hydrogenation

Electrolysis

Acetone is oxidized with

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Tollen's reagent

Fehling solution

Acidic dichromate solution

Benedicts solution

One kilocalrie is equal to

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4.184 x 10³J

4.184 x 10⁴J

4.184 x 10²J

None of these

Mustard gas is a :

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Gas

Liquid

Solid

High boiling point

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