Question # 1

I a chemical reaction equilibrium is said to have been established when :

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Rate of opposing reactions are equal.

Rate constants of opposing reactions are equal.

Opposing reactions stop.

Concentration of reactants and products are equal

Coordinate covalent bond is present in the molecules

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H₂O

BF₃

SiO₂

SO₂

Chloroflurocarbon releases a chemical harmful to ozone

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Fluorine

Chlorine

Nitrogen peroxide

Sulphure dioxdie

Which represents nucleophilic aromatic substitution reaction?

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Reaction of benzene with Cl₂in sunlight

Benzyl bromide hydrolysis with water

Reaction of NaOH with dintrofluoro benzene

Sulphonation of benzene

The IUPAC name fo CH₃COCH (CH₃)₂is

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4-Methylisopropyl ketone

3-Methyl-2 butanone

Isopropylmethyl ketone

2 - Methyl- 2 butanone

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Decrease in temperature favour more dissolution of the salt

Increase in temperature favour more dissolution of the salt

Lowering pressure favour more dissolution of the salt

Increasing pressure favour more dissolution of the salt

Preparation of vegetable ghee involves:

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Halogenation

Hydrogenation

Hydroxylation

Dehydrogenation

On heating acetaldehyde with ammonical silver nitrate solution, we get

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CH₃OH

Silver acetate

HCHO

Silver mirror

Estimation of Na in sea water is an example of :

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Numerical analysis.

Qualitative analysis.

Quantitative analysis.

None of above.

The state of hybridization of carbon atom in methane is

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sp³

sp²

sp

dsp²

A free radical reaction takes place in three steps, initiation, propagation and terminations. Which of the following expression represents a propagation step

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Which of the following is the use of electrolysis?

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Eletrorefining

Electroplating

Both A and B

None of the above

When a carbon atom forms single bonds with other carbon atoms, these hybrid orbitals overlap with the orbitals of hydrogen to form four bonds which are

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Three sigma and one P_i

Two sigma and two P_i

One sigma and three P_i

sigma

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Proton donar

Dehydrating agent

Catalyst

Electrophile

Terylene is madeby polymerization of terephthalic acid with

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Ethylene glycol

Phenol

Ethanol

Catechol

Which one of the following substances is used to decolourizing agent

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Abestos

Animal charcoal

conc. H2SO4

Silica gel

RNA is a polymer of nucleotide which consist of three components. Which one is not the component in the nucleotide of an RNA

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D-Ribose

Wracil base

Prosphate group

Thyamine base

Methyl alcohol is not used:

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As a solvent

As an anti-freezing agent

As a subsitution for petrol

For denating of ethyle alcohal

While balancing an equation by ion electron method, the number of oxygen atoms are balanced by

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OH^-

H₂O

O₂

H⁺

What will react differently with the two isomeric pentols, (CH₃)₃CCH₂OH and (CH₃)₂CH CH₂CH₂OH

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Acidified (aq) KMnO₄

Concentrated H₂SO₄

PCl

Sodium

Sodium is manufacture by the electrolysis of fused sodium chloride and not from an aqueous solution of sodium chloride because

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Sodium chloride does not ionize in the water solution

Sodium chloride is not soluble in water

Sodium deposited at the cathode may react with water to form sodium hydroxide

Electricity does not pass through aqueous NaCl

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Electrophilic addition

Electrophilic substitution

Free radical substitution

Nuclophilic addition

Factor which slows down the rate of reaction is

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Small size of the particles of the reactant

High temperature of reaction

More concentration of reactant

Lowering the temperature

Which of the following compounds is explosive in nature?

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Phosphorus trichloride

Nitrogen trichloride

Hyponitrous acid

Nitrosyl chloride

Hydrocarbans, SO₂, CO, NH₃, nitrogen oxides and compounds of fluorine are called

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Primary pollutant

Secondary pollutant

Tertiary pollutant

None of these

Maximum potential energy that an electron can have within the atom is:

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Equal to zero.

Less than zero.

Greater than zero.

Infinite

Which of the following is an inert gas?

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H₂

O₂

N₂

Argon

Which of the following is not an air

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N₂

N₂O

NO

CO

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Iodine can oxidise iron

Bromine can oxidise iron

Iodine can oxidise bromine

Iron can oxidise bromine

Which is the formula of tetra-ammine chloronitro platinum (VI) sulphate?

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[Pt(NH₃)₄(NO₂)]SO₄

[PtNO₂Cl(NH₃)₄]SO₄

[PtCl(NO₂)(NH₃)₄]SO₄

[Pt(NH₃)₄(NO₂)Cl]SO₄

Which of the following is not present in RNA?

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Uracil

Thymine

Ribose

Phosphate

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