Question # 1

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

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The have an electrophilic carbon

They have an electrophilic carbon and a bad leaving group

They have an electrophilic carbon and a good laving group

They have a nucleophilic carbon and a good leaving group

Water is purified by:

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Filtration

aeration

coagualation

All of these

SO2 and NO2 cause pollution due to increase in:

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buffer action

basicity

acidity

neutrality

Which of the following least resembles an ideal gas?

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ammonia

helium

hydrogen

trichloromethane

Alcohol is less acidie than phenol due to

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higher ka value

Instability of alkoxide ion

stability of carbocation

Stability of phenol

Biochemical oxygen demand (BOD) is the capacity of organic matter in natural water to consume oxygen with in a period of

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2 day

6 day

5 day

7 day

What will be the pH of 1.0 mol dm-3 of NH4OH, which is 1% dissociated

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2

12

0

2.7

Which of the compounds cannot show positional isomerism?

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Alkanes

Alkenes

Alkynes

Alcohols

^{Reaction of ethyl bromide with ammonia}

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Completes in a single step

Completes in two steps

Continues till N is left with no lone pair

is reversible

About 25% of earth crust mass is made up of element

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Oxygen

Silicon

Aluminium

Aluminates

In the reaction A2 (g) + 4B2 (g) <-----------> 2AB4 (g) such that ∆H < 0, the formation of AB4(g) will be favoured at

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Low temperature and high pressure

Low temperature and low pressure

High temperature and low pressure

High temperature and high pressure

Alkali metals in each period have

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Smallest size

Lowest IE

Highest IE

Highest electronegativity

Result of ozone hole is

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Green house effect

Global warming

Acid rain

UV rays reach the earth

The presence of a double bond in a compound is the sign of

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Saturation

Unsaturation

Substitution

None of above

At room temperature formaldehyde is

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Gas

Liquid

Solid

None of the above

The amount of solute present in the given amount of solvent is called

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Molarity

Molality

Concentration

Solubility

The element caesium bears resemblance with

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Ca

Cr

Rubidium

None of the above

Which compound is more soluble in water

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C₂H₅OH

C₆H₅OH

CH₃OCH₃

n-hexanol

Phosphorus pentoxide finds use as

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An oxidizing agent

A reducing agent

A bleaching agent

A dehydrating agent

The acid present in vinegar is

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CH₃COOH

HCI

H₂SO₄

HCOOH

A chemical inert and heat resistant plastic, that is made form tetrafluoroethlene, is called

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Teflon

PVC

Bakelite

Polyamide

Alcohols, phenols and ethers may be considered as derivative of

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Hydrocarbons

Benzene

Carboxylic acid

Water

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