Question # 1

Which gasoline is better?

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Of low boiling point

Of low molecular mass

Of high octane

All of these

Meta directing group decreased the ----------- of benzene ring

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Physical activity

Chemical reactivity

Density

None

Choose the correct answer of transition elements?

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Transition elements have low melting points

Transition elements do not have catalytic activity

Transition elements exhibit variable oxidation states

Transition elements exhibit inert pair effect

When an aqueous solution of potassium salt of monocarboxylic acid is subjected to electrolysis, corresponding alkane is formed. This reation is known as

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Cannizaro reaction

Sabatier-secderens reaction

Alkylation

Kolbe's reaction

Which of the following is complex?

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CaSO₄. 0.5H₂O

(C₆H₁₀O₅)_n

C₆H₁₂O₆

CH₄

A dry alkaline cell has porous Zn anode and MnO₂as cathode the electrolyte used is

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Ca(OH)₂

NaOH

KOH

NH₄OH

The condition for standard enthalpy change is

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1 atm 30°C

1 atm 50°C

1 atm 25°C

760 atm 25°C

Electronegativity values of the elements F, CI and Br vary

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F > CI > Br

Br > CI > F

Cl > Br > F

CI > F > Br

Quantity of heat evolved or absorbed during the reaction is measured according to the equation

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Fe can displace Cu form CuSO4solution because

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Fe is ferromagnetic

Fe is below Cu in electrochemical series

Fe is above Cu in electrochemical series

Fe exists in divalent oxidation state

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

Commercial common salt becomes slight damp on storing because

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Common salt is hygroscope

Common salt contains some impurity, which is hygroscopic

Salt in efflorescent

Salt is crystalline

Which of the following forms a toxic substance in blood by combing with hemoglobin?

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Carbon dioxide

Carbon monoxide

Oxygen

Methane

In Lucas test primary alcohol make as oily layer

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Immediately

In 10 mins

On heating

Not

Heaviest particle is

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Meson

Neutron

Proton

Electron

What are the products electrolysis of aqueous sodium chloride at two electrodes

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Chlorine at anode and oxygen at cathode.

Hydrogen at anode and chlorine at cathode.

Chlorine at anode and hydrogen at cathode.

Chlorine at anode and sodium at cathode.

Which of the following reacts with chloroform and base to form phenyl isocynaide?

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Nitrobenzene

Phenol

Chlorobenzene

Aniline

The electrophile in aromatic sulphonation is

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H₂SO₄

HSO₄

SO₃

SO₃⁺

Cell potential depends upon :

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Concentration of ions

Nature of electrolyte

Temperature

All of above

Which of the following possesses the highest melting point?

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Chlorobenzene

0-Dichlorobenzene

m-Dichlorobenzene

p-Dichlorobenzene

C₆H₆Cl₆can be obtained from

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HCl and Benzene

Cl₂and Benzene and AlCl₃

Cl₂and Benzene in diffused light

NaOCl and Benzene

Alcohols reacts with Grignard reagent to form

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Alkanes

Alkenes

Alkynes

All

______ are called biocatalysts

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Organic acids

Organic bases

Enzymes

All

According to the periodic law, the chemical properties of the elements are periodic functions of their

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Density

Atomic number

Atomic mass

Mass number

Glycogen is stored in

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Animals

Plants

Soil

None of these

Which reagent could be used to distinguish between CH₃CH(OH)CH₂CHO and CH₃COCH₂CH₂OH

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Acidified potassium dichromate

Dilute sulphuric acid

2,4-dinitrophenylydrazine

Fehling's reagent

Peat before conversion to bituminous coal is converted to

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Lignite

Anthracite

Asphalt

None

SO₂and NO₂produce pollution by increasing

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Alkalinity

Acidity

Neutrality

Buffer action

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An orbital can accommodate maximum two electrons with opposite spins according to

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Heisenberg's principle

Aufbau principle

Hund's srule

Pauli exclusion principle

0.5 mole of CH₄and 0.5 mole of SO₂gases have equal

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Volume

Mass is gram

Total number of atoms

Number of molecules

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