Question # 1

The nitration of benzene takes place when it is heated with a mixture of conc.HNO₃and conc. H₂SO₄at 50°C in ratio of

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1 : 2

1 : 1

1 : 3

2 : 1

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

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Bonding behaviour

Electronegativity

Ionisation potential

Neutral/proton ratio

Hybridization of each carbon atom in benzene ring is

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sp hybridized

sp²hybridized

sp³

dsp²

Molecular orbitals are filled with the available electrons according to:

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Hund's of rule.

Pauli's exclusion principle.

Aufbau principle.

All of above.

The amino group in 19α-amino acids is primary; only oneα-amino acid has secondary amino group which one is that

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Alanine

Glutamic acid

Glycine

Proline

Tollen's reagent is

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Ammonical cuprous chloride

Ammonical cuprous oxide

Ammonical silver bromide

Ammonical silver nitrate

Which is the chain isomer of n-pentane

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Isopentane

Neopentene

N-pentene

Isopentene

The element with highest electron affinity among the halogen is

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F

Cl

Br

I

Acidification of the soils due to addition of synthetic nitrogen fertilizer, is corrected by using

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Gypsum

Sodium nitrate

Limestone

Potassium nitrate

Which of the following reagent cannot be used for preparing alkyl chloride from alcohol?

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HCl + anhyd. Zncl₂

NaCl

PCl₅

SOCl₂

An azeotropic mixture showing it's positive deviation from Raoult's law, the volume of the mixture is :

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Slightly more than the total volume of the components.

Slightly less than the total volume of the components.

Equal to the total volume of the components.

None of these.

Any property which depends upon the T.P and V is said to be

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Property due to k.E.

Property due to PE

Both a and b

Thermodynamic state

Alcohals can be distinguished using test:

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Lucas

Tollen's

Koib's

William's

Elimination bimolecular reactions usually obey

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First order kinetics

Second order kinetics

Third order kinetics

Zero order kinetics

S_N1 reaction of alkylhalides leads to

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Retention of configuration

Recemisation

Inversion of configuration

None of these

Which of the element is not alkali metal

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Lithium

Rubidium

Francium

Magnesium

Which statement explains the observation that magnesium hydroxide dissolve in aqueous ammonium chloride, but not in aqueous sodium chloride

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The ionic radius of the NH₄⁺ion is similar to that of Mg²⁺but not that of Na⁺

NH₄Cl dissociates less fully than NaCl

The ions Na⁺and Mg²⁺are isoelectronic (have the same number of electrons)

The ion NH⁺₄acts as an acid

When formaldehyde is added to Grignard reagent we get

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Aldehyde

Acetone

Primary alcohol

Secondary alcohol

Which nitrogen fertilizer is favoured in tropical regions because of its-hygroscopic nature

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Ammonium sulphate

Ammonium nitrate

Ammonium chloride

Ammonium phosphate

Which one of the following elements occurs free in nature?

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N

P

As

Sb

Reaction of Grignard's reagent with ketones gives: Reaction of Grignard's reagent with formaldehyde gives:

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Pri-alcohol

Sec-Alcohol

Ter-alcohol

Carboxylic

Which is a mixture of low boiling hydrocarbon

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Natural gas

Petroleum

Wood

Graphite

Electrochemistry is concerned with the conversion of electrical energy into chemical energy in :

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Galvanic cell

Electrolytic cell

Voltaic cell

Both (a) and (c)

Kolb's method is not useful for the production of

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Methane

Ethane

Propane

Butane

The solutions of NaCl and KCl are prepared separately by dissolving same amount of solute in water, which of the following statements is true fro these solutions ?

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KCl solution will have higher boiling point than NaCl solution.

Both the solutions have same boiling points.

KCl and NaCl solutions possess same vapour pressure.

KCl solution possesses lower freezing point than NaCl solution.

Types of cracking are:

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Thermal

Catalytic

Steam

All a, b ,c

Which is used in navigational equipments?

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B

Be

Mg

Al

Which of the following statements is most appropriate about effective nuclear charge? It depends upon

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The shielding constant

The atomic number

The charge on the nucleus

Both the nuclear charge and the shielding constant

What is the nature of SO₂

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Basic

Strongly acidic

Weakly acidic

Amphoteric

Photons of yellow colour are ______ energetic than violet colour

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More

Less

Equal

None

The process in which one s and two p orbitals mix up with each other is called

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Sp-hybridization

Sp²-hybridization

Sp³-hybridization

Dsp²-hybridization

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