Question # 1

Which of the following hydrogen halide is the weakest acid in solution.

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HF

HBr

HI

HCl

The word paper is derived from the name of which reedy plant

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Rose

Sun flower

Papyrus

Water

Which compound is formed, when CH₃OH reach with CH₃- Mg -Br

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Ethane

Methane

Ethanol

Acetone

Which one of the following species is not an electrophile.

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HN3

Br

H+

BF3

What are the total numbers of periods in the modern periodic table.

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3

5

7

8

Cholesterol is an important precursor in the biosynthesis of

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Sex harmonies

Adrenal hormones

Vitamin D

All of these

Bromine can be liberated from KBr solution by the action of.

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I2 solution

Chlorine

NaCl

KI

Air of the following tests are used to identify aldehydes except.

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Tollen's test

Fehling test

Baeyer's test

Benedict test

Boric acid is used as eye wash due to its

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Weakly acidic property

Antiseptic nature

Antibiotic nature

Weakly basic properties

The pH of truly acidic rain is

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7-6.8

6.5-6

6-5.6

less than 5

The substance which is added to remove impurities is known as

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Slag

Flux

Ore

Gangue

Grignard's reagent is reactive due to

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the presence of halogen atom

the presence of Mg atom

the polarity of C-Mg bond

none of the above

Which one of the following is secondary pollutant of atmosphere.

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CO

NO2

SO2

H2SO4

The reaction of alkyl halides with sodium metal in the presence of ether to from alkane is known as.

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Wortz reaction

Frankland reaction

Sabatier sendron

Kolbe's synthesis

when aldehydes react with Tollen's reagent.

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A ketone is produced

An alcohol is produced

Ag ions are produced

Ag ions are reduced

Vinyl chloride when boiled with alcoholic KOH , gives

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Acetylene

Ethylene

Ethene

Ethyl alcohol

Sulphur is essential constituent for plants. Which is not role of sulphur

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Chlorophyll development

Development of root system

Constituents of some proteins

Increase transpiration force

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

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