Question # 1

A single chlorine free radical can destroy how many ozone molecules

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100

100000

10000

10

Carbon monoxide is pollutant as it

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Inactivates nerves

Inhibits glycolysis

Combines with oxygen

Combines with hemoglobin

The chemical formula of magnesite is

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MgCl₂

Mg(HCO₃)₂

MgCO₃

None of these

The percentage of H is the highest in

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CH₄

NH₃

H₂SO₄

C₆H₁₂O₆

HNO₂acts as an/a

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Acid

Oxidizing agent

Reducing agent

All the three

Which isomers of C₅H₁₁OH gives, on dehydration, the greatest number of different alkenes

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Ethyl chloride on treatment with aqueous alkali gives

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Ethane

Ethene

Ethanal

Ethanol

Which set of hybrid orbitals has planar triangular shape

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sp³

sp

sp²

dsp²

Eutrophication causes reduction in

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Dissolved hydrogen

Dissolved oxygen

Dissolved salts

All the above

Alkyl halides are considered to be very reactive compounds towards nucleophiles, because:

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They have an electrophilic carbon

They have an electrophilic carbon and good living gorup

They have an electrophilic carbon and bad living group

They have an nucleophilic carbon and good living gorup

1.0 g pure calcium carbonate was found to require 50 ml of dilute HCl for complete reaction. The strength of HCl solution is given by

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4 N

2 N

0.4 N

0.2 N

Which of the following is halo form

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CHBr₃

CHCI₃

CHI₃

All of these

Acetic acid is miscible in:

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Water

Alcohol

Either

All of these

Standard reduction electrode potential of three metals A, B and C are erespectively + 0.05 V, -3.0 and -1.2V. The reducting power of

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B > C > A

A > B > C

C > B > A

A > C > B

Silver oxide battery has a voltage of

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2.0 V

1.5 V

2.5 V

1.0 V

Which of the following reagents is used to distinguish acetone and acetophenone

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NaHSO₃

Grinard reagent

Na₂SO₄

NH₄Cl

The toxic organic compounds and heavy metals and metalloids results in contamination of

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Surface water

Ground water

Both surface and ground water

Neither surface nor ground waters

Which of the following salt is used as purgative

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CaSO₄

MgSO₄

BeSO₄

NaCl

The degree of unsaturation in fats or oils is usually measured by numbers of grams of iodine required by 100 grmas of fat, this is called

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Oil number

Saturation number

Iodine number

Un saturation number

Alkali metals in each period have

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Smallest size

Lowest IE

Highest IE

Highest electronegativity

Calcium carbide reacts with water to produce

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Acetylene

Methane

Ethylene

Ethane

The number of de-electrons retained in Fe²⁺(At.No. of Fe = 26) ions is

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3

4

5

6

When sodium benzoate is treated with soda lime (NaOH) benzene is formed. What is the other product

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Na₂CO₃

NaHCO₃

Ca(OH)₂

CaCO₃

Which is the formula of tetra-ammine chloronitro platinum (VI) sulphate?

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[Pt(NH₃)₄(NO₂)]SO₄

[PtNO₂Cl(NH₃)₄]SO₄

[PtCl(NO₂)(NH₃)₄]SO₄

[Pt(NH₃)₄(NO₂)Cl]SO₄

The formation of PVC from vinyl chloride is an example of

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Substitution reaction

Addition polymerization

Condensation polymerization

Condensation reaction

Which of the following derivative can not be prepared directly from acetic acid

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Acetamide

Acetyl chloride

Acetic anhydride

Ethyl acetate

Acetylene gives

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White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu(NO3)2

White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu2C12

White ppt. with both

Red ppt. with both

Which of the following is a characteristic of a reversible reaction?

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It never proceeds to completion

It can be influenced by a catalyst

It proceeds only in the forward direction

Number of moles of reactants and products are equal

n + l value for 4f will

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2

5

7

9

The structure of complex hydrides is

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Tetrahedal

Trigonal

Octahedral

Square planar

Denaturation of protein means the structure of protein is disrupted, indicate which factor foes not denature protein

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Heating protein

pH changes

Oxidising agent

Keeping pH 7.35

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