Question # 1

The concentration of dissolved molecular oxygen in water which acts as the most important oxidizing agent ranges from

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2 ppm - 6 ppm

2 ppm - 4 ppm

4 ppm - 8 ppm

2 ppm - 3 ppm

Which of the following molecule has zero dipole moment?

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PCI3

BF3

NH3

H2O

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

The typical range of the H-bonding is:

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1-2 kj/mol of bonds

5-25 kj/mol of bonds

500 kj/mol of bonds

Which of these polymers is a synthetic polymer

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Animal fat

Strach

Cellulose

Polyester

Ice floats on water because

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the hydrogen bonding in ice is stronger than that of in water

empty spaces are left in ice

ice has two-dimensional structure

the bond length of the oxygen and hydrogen bond is different in water and ice

The largest item which is recycled is

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newspaper

plastic

aluminium

oil

Photo chemical smog contains ______ as main reactants

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Nitrons oxide and unburnt hydrocarbons

Nilric oxide and unburnt hydrocarbons

No and burnt hydrocarbons

N₂O and burnt hydrocarbons

Which of the statement is applicable for both ideal and real gases molecules?

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Have no forces of attraction

Collisions between the molecules is elastic

Molecules are in random movement

The actual volume of gas is negligible as compared to the volume of gas

An electron with drawing group attached to e-position in phenol

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makes it basic

Stabilises the phenoxide ion

decreases its basicity

allows it to precipitate in aqueous solution

Most reactive among the following

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Li

Mg

Ca

Na

I-Chloropropane has two isomers, it is an example of

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Chain isomerism

Position isomerism

Functional group isomerism

Metamerism

Which of the following is produced when an aqueous solution of butan-2-ol is refluxed with dil acidified KMnO₄

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Butanol

Butanoic acid

Butanone

Butane

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Q and R Q and R

R only Q and R

Q and R R only

Q only R only

The sum of the exponents of the conc. terms in the rate equation is called

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Rate of reaction

Order of reaction

Specific rate constant

Average rate

CuSO₄. 5H₂O is used to prepare

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Transition complex

Fehling's 'A' sol

Fehling's 'B' sol

Fehling's sol

The valence shell of hydrogen is half filled like those of

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IV - A

VIA

V - A

VIIA

which one of the following is not a nucleophile?

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H₂O

H₂S

BF₃

NH₃

The element with atomic number 26 will be found in group

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2

8

6

10

Weakest acid among the followings is

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Acetic acid

Phenol

Water

Acetylene

Two or more similar monomers combine to form:

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Homopolymer

Copolymer

Ter Polymer

Thermoplastic polymers

Paraffins are also called

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Alkanes

Alkynes

Alkenes

None of these

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