Question # 1

Which of the following reagents reaet in same manner with HCHO, CH3CHO andCH3COCH3

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HCN

Cu2(OH)2/ NaOH

Ammonical AgNO3

Cu(OH)2 only

The standard reduction potential of Zinc is

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0.76V

0.34

-0.34V

-0.76V

Final product of hydrolysis of nitrile is

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Ketone

Alcohol

Aldehyde

Carboxylic acid

Chemicals used to kill herbs are:

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Herbicides

Insecticides

Pesticides

Fungicides

A large hole in the ozone layer over antarctica region was discovered in:

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1960s

1970s

1980s

1990s

The carbon atom of an alkyl group attached with halogen atom is called

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Electrophile

Free redical

Nucleophile

Nucleophilic centre

TiCl4 is used as catalyst for manufacture of

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Sulphuric acid

Plastics

Ethanol

Tetraethyl lead

Choose a point which is not included in the components of environment:

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stratosphere

hydrosphere

lithosphere

biosphere

All the metal shine when they are freshly cut The reason is

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the conductivity of the metal is increased

the process of cutting gives energy to the metal atoms

the electrons become less delocalized according to valance bond theory

the electrons are excited at higher energy levels and emit the photons when they fall back

The change in enthalpy of a system when one mole of the substance is completely burnt in excess of air or oxygen is called

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Heat of reaction

Heat of formation

Heat of atomization

Heat of combustion

Partial pressure of gases in a mixture depend upon:

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Number of moles

Number of protons

Number of electrons

Number of neutrons

Photons of yellow colour are ______ energetic than violet colour

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More

Less

Equal

None

An organic compound 'X' on treatment with acidified K₂Cr₂O₇gives a compound 'Y' which reacts with I₂and sodium carbonate to form Triodomethane. The compound 'X' is

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CH₃OH

CH₃CHO

CH₃CH(OH)CH₃

CH₃COCH₃

Wolf-kishner reduction is used for the reduction of

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Nitro compounds

Carboxylic acids

Carbonyl compounds

Olefins

The electrode through which the electrons enter the electrolytic solution is electrolytic solution is

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Anode

Cathode

May be anode or cathode

None of these

Which one of these is weakest?

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Ionest bond

Covalent bond

Metallic bond

Van der Waal's forces

Gooch crucible is made of:

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Brass

Porcelain

Bronze

.Gold

Which is not a steroid

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Cholesterol

Ergosterol

Phospholipids

None of these

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450°C

250°C

850°C

1000°C

Synthesis of rubber is made by polymerization of

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Chloroform

Acetylene

Divinylacetylene

Butene

A homogeneous mixture of two or more than two chemical substances is called

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Solute

Solution

Solvent

Salvation

The unit of rate constant K ismole^-1 dm³for a chemical reaction, the order of reaction is :

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Order of reaction can determined by an experiment

Order of reaction can determined from a balance equation only.

Order of reaction can determined increases by increasing temperate.

Order of reaction must be in whole number and not in fraction.

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