Question # 1

Ammonia gas used directly as a fertilizer injected into the soil at a depth of about:

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two inches

three inches

five inches

six inches

Total heat content of a system is called

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Internal energy

Entropy

Enthalpy

All of these

The alkaline hydrolysis of bromoethane shown below gives alcohol as the product: H3C-CH2-Br-------H3C-CH2-OH

The reagent and the condition used in this reaction may be:

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H20 at room temperature

KOH in alcohol

Ethanol. heat

Dilute NaOH(aq) warm

An example of bydrolase is

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Amylase

Lipase

Fumarase

A,C

Boiling point of H₂O is higher than that of HF although F is more electronegative than O. It is due to

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stronger dipole dipole forces in H₂O

H₂O is neutral HF is acidic

H₂O is angular, but HF is linear

number of hydrogen bonds more in H₂Othan in HF

Amorphous solids

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have sharp melting points

undergo clean cleavage when cut with knife

have perfect arrangement of atoms

can possesses small regions of orderly arrangements of atoms

Which step is unnecessary for purification of water for drinking purposes

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aeration

coagulation

treatment with chlorine

treatment with iodine

The enthalpy of formation of a compound is

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Positive

Either positive or negative

Negative

None

Primary pollutant is that:

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Waste product of an industry

Which causes cancer

Whose concentration cannot be controlled

Which corrode the metal only

The composition mixture of clay and lime stone in a raw material is:

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75% limestone & 25% clay

15% limestone & 55% clay

25 limestone & 75% clay

55% limestone & 15% clay

The best concentration unit used for K⁺ ions present in potable water is

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ppm

Mole fraction

Molarity

Molality

pH of 1 molar NaOH is

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7

zero

14

10

How many alcohol (including both structural isomers and stereoisomers) can have the molecular formula C₄H₁₀O

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3

4

5

6

If 5.85 of NaCI are dissolved in 90g of water the mole fraction of NaCI is

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0.1

0.01

0.2

0.0196

Copolymer is

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Nylon-6

Nylon 66

PMMA

Polyethene

Result of ozone hole is

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Green house effect

Global warming

Acid rain

UV rays reach the earth

With increases in temperature of 10 K of the reacting gases the rate of reaction is doubled because

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Increase in number of collisions

Number of molecules having energy more than Ea is doubled

Increase in order of reaction

Increase in surface area

The solution of which acid is used for seasoning of food

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Formic acid

Acetic acid

Benzoic acid

Butanoic acid

The reaction rate is expressed in the units of

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Mol dm^-3S^-

Mol dm^-3

Mol dm^-3N^-

dm^-3S^-

In the earth crust sodium is

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2.50%

2.30%

2.40%

3.50%

Carbon monoxide is harmful to human beings as it

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Is carcinogenic

Is antagonistic to CO₂

Has higher affinity for hemoglobin as compared to oxygen

Is destructive to O₃

How many cm³of 1 M H₂SO₄required to neutralize 10 cm³of 1 M NaOH

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2 cm³

2.5 cm³

5 cm³

10 cm³

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