Question # 1

Ecosystem is smaller units of.

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Lithosphere

Hydrosphere

Atmosphere

Biosphere

The pH range of the acid rain is.

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7-6.5

6.5-6

6-6.5

Less than 5

Cholesterol is an important precursor in the biosynthesis of

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Sex harmonies

Adrenal hormones

Vitamin D

All of these

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

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Rose

Sun flower

Papyrus

Water Hyacinth

An aldehyde is reduced to alkane with hydrazine is the presence of

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KOH

NaOH

CaO and NaOH

Ca(OH)2

In which substance silicon is not present.

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Talc

Asbestos

Dolomite

Zirocon

The most reactive Alkyl halide is

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Alkyl Iodide

Alkyl Bromide

Alkyl fluoride

Alkyl Chloride

Which one of the following polymers is called a polyamide

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Nylon

Rayon

Terylene

Orlon

When carbon di oxide is bubbled through lime water, white precipitate is formed This precipitate is.

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COCl2

H2CO3

CaO

CaCO3

Which elements are needed for healthy growth of plants

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N,S,P

N,Ca,P

N,P,K

N,K,C

Which condition are not suitable for the growth of enzymes.

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Temperature between 25 ^oC to 37 ^oC

Solution must be dilute

Environment must be aerated

Some preservative should be present in solution

First organic compound prepared in laboratory was.

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Glucose

Methane

Urea

Alcohol

The avoid teh formation of toxic compounds with chlorine which substance is used for disinfecting water.

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KMnO4

O3

Alum

Chloramines

Amongst the following, the compound of that can be most readily sulphonated is

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Toluene

Benzene

Nitro-benzene

Chloro-benzene

Catalyst used in thermal cracking

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Platinum

Nichel

Al2O3 and SiO2

Fe2O3 and CuO

Phenol is also known as

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Citric acid

Carbonic acid

Carbolic acid

Maleic acid

Cyanogen chloride reacts with ethyl magnesium bromide to give

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CH₃CH₂Cl

CH₃CH₂Br

C₄H₁₀⁺

CH₃CH₂CN

Which one of the following is not a heterocyclic compound.

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Furan

Thiophene

Pyridine

Aniline

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