Question # 1

Which class of compound cannot show positional isomerism?

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Alkanes

Alkene

Alkynes

Alcohol

A polymeric substance that is formed in the liquid state and then hardened to a rigid solid is called:

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fiber

plastic

varnish

polyamide resin

In diamond, which hybridization is there?

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sp2

dsp2

sp3

sp

Newspapers can be recycled again and again by how many times

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5

2

4

3

Methyl mercaptan, CH₃SH, is one of the substances responsible for bad breath and is often used to impart a smell to natural gas in a pipeline.
What will be formed when CH₃SH is burned in an excess of air?

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CO CO₂ H₂S

CO H₂O SO₃

CO₂ H₂O SO₂

CO₂ H₂O SO₃

Which of the following elements is most metallic

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Bi

sb

As

P

The reaction which is responsible for the production of electricity in the voltaic cell is

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Hydrolysis

Oxidation

Reduction

Redox

Which of the following human activities are contaminating surface and ground waters?

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pesticides

septic ranks

petroleum and natural gas production

all of these

The partial pressure of gas can be calculated if we know total pressure of mixture and:

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Number of protons

Number of electrons

Number of neutrons

Mole fraction of gases

Essential alpha-amino acids are those which are necessary in the diet.

Which one is an essential alpha-amino acids

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Alanine

Aspartic acid

Glycine

Tryptophan

When does average rate become equal to instantaneous rate of reaction

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At the start of reaction

time interval is zero

at the end of reactior

time interval approaches zero

Which of the following does not reflect the periodicity of elements?

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Bonding behaviour

Electronegativity

Ionisation potential

Neutral/proton ratio

In passage of electricity through aqueous solution of AgNO₃silver dissolves at anode to form Ag⁺, the electrodes are

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Silver metal

Pt metal

Graphite

Copper metal

What is the structure of the ester formed from propanoic acid and ethanol

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The empirical formula of a compound is CH₂O. What may be the compound

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C₂H₅OH

C₆H₅OH

HCOOH

Formaline Contains ______% alcohol

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80

37

8

52

A peptide having molecular mass upto 10,000 is called a

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Vitamin

Protein

Polypeptide

Dipetide

The alkynides are used for the ----------- of alkynes

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Pxperation

Purification

Seperation

All of above

Which of the following is a carbonate are?

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Pyrolusite

Malchite

Diaspore

cassiterite

Amino acids are buildng blocks of:

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protein

Carbohydrates

Lipids

fats

The general formula for alkenes is

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C_nH_2n+1

C_nH_2n+2

C_nH_2n

C_nH_2n-2

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Homogeneous

Heterogeneous

Isogeneous

None

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