Question # 1

Which one of the following substances is a synthetic polyester

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Cotton

Nylon

Rayon

Terylene

Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBh₄or LiAH₄?

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1-Propanol

2-Propanol

2-Methyl2-Proponal

Ethanol

Toluene can be oxidized to benzoic acid by

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KMnO₄(alk)

K₂Cr₂O₇(acidic)

Both

None

Which of the following elements is not present abundantly in earth's crust?

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Silicon

Aluminium

Sodium

Oxygen

The total number of transition elements is:

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10

14

40

50

Which one of these is weakest?

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Ionest bond

Covalent bond

Metallic bond

Van der Waal's forces

The atomic radius of hydrogen is 37

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Pecometer

Manometer

Angstrom

Micrometer

Atomospheric pollutant is

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CO₂

CO

O₂

N₂

Amongst the following the compound that can be most readily sulphonated is

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Toluene

Benzene

Nitrobenzene

Chlorobenzene

The amino acids which human body can synthesize are called ______ amino acid

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Essential

Non essential

Acidic

Basic

Which compound is more soluble in water

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C₂H₅OH

Benzene

CH₃OCH₃

Hexane

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

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Carbon dioxide

Carbon monoxide

Oxygen

Methane

NaBH₄and LialH₄are

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Ionic hydrides

Covalent hydrides

Interposal hydrides

Complex hydrides

The correct arrangement of increasing order of atomic radius among Na, K, Mg, Rb is

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Mg < K < Na < Rb

Mg < Na < K < Rb

Mg < Na < Rb < K

Na < K < Rb < Mg

The sun of all the energies of atoms, molecule, ion, within system is called

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Enthalpy

K.E. of the system

Internal energy

None

Li has the lowest reduction potential while the element with highest reduction potential is

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H

F

O

N

Solubility of a substance in water decreases with rise in temperature except

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CaCI₂. 6H₂O

Pb(NO₃)₂

K₂Cr₂O₇

Ce₂(SO₄)₃

Which of the following elements should be the least metallic in character

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Rb

ln

Te

l

Which of the following has ester linkage?

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Nylon

Bakelite

Terylene

PVC

Self condensation of acetaldehyde in the presence of dilute alkalies gives

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An acetal

An aldol

Mesitylene

Propionaldehyde

Which of the following has zero depole-moment?

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CIF

PCl₃

SiF₄

CFCl₄

Which of the following reactions occur at moderate rate :

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Rusting of iron

Chemical weathering of stone work of buildings by acidic gases in atmosphere.

Hydrolysis of an ester

Fermentation of sugars

Easter are pleasant smelling compounds. Which ester posseses odour like pineapple

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Amylacetate

Amylbutyrate

Ethylbutyrate

Benzylacetate

Identify the incorrect statement with respect to ozone

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Ozone is formed in the upper atmosphere by a photochemical reaction involving dioxygen

Ozone is more reactive than diaoxygen

Ozone is diamagnetic whereas dioxygen is paramagnetic

Ozone protects the earth's inhabitants by absorbing gamma-radiations

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0 dm³

3 dm³

2 dm³

3 dm³

Which class of compound is more reactive

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Alkane

Alkene

Alkyne

None

The rate of reaction :

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Remain same as reaction proceeds.

May decrease or increase as reaction proceeds .

Increase as reaction proceeds.

Decreases as reaction proceeds.

When propanamide reacts with Br₂and NaOH then which of the following compounds is formed?

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Ethyl alcohol

Propyl alcohol

Propyl amine

Ethylamine

The total number of orbitals possible for the quantum number n is

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n

n²

2n

2n²

What mass of NaOH is required to prepare 2.5 dm³of 1.5 M NaOH solution

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130 g

140 g

150 g

160 g

The ionic bonds are

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Unidirectional

Bi-directional

Non-directional

Multi-directional

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