Question # 1

What is the cause of water pollution

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Chemical and bacterial contents in live stock

The spilled oil in rivers and ponds

Wide spread use of pesticides

All of the above

ΔH for an endothermic reaction carries

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Positive sign

Negative sign

Both sign

None of these

Reaction of ethylamine with chloroform in alcoholic KOH produces

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CH₃OH

CH₃NC

C₂H₅NC

C₂H₅CN

Potassium chromate has formula

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KClO₃

K₂CO₃

K₂CrO₄

K₂Cr₂O₇

When a nitrogeneous base combine with a sugar it is called

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Ribose

Nucleotides

Nucleoside

None

Which one of the following reagents will distinguish between C₆H₅CHO and C₆H₅COCH₃

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Aqueous bromine

Phosphorus pentachloride

2, 4 DNPH

Tollen's reagent

Francium is an element at the bottom of Group I in the Periodic Table. Which one of the following predication is likely to be correct?

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It will react with water to liberate oxygen

Its hydroxide will be a strong alkali in water

Its carbonate will decompose on heating to give carbon dioxide

Its nitrate on heating will give nitrogen dioxide and oxygen

First atomic theory was put forward by an English school teacher:

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Maxewell

Newton

Sanger

John Dalton

Proteins and amino acid can be separated by:

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Filtration

^Sublimation

Chromatography

Suction

Al³⁺is a symbol for aluminium

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Atom

Ion

Cation

Anion

XeF₄has shape of

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Sphere

Trigonal bipyramidal

Tetrahedral

Square planar

Optical rotation method is sued when

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Reaction involve ions

Change of refractive indices

Reactions involving change of optical activity

None of the above

Which one of the following properties is not correct for ozone?

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It oxidizes lead sulphides

It oxidizes potassium iodide

It oxidizes mercury

It cannot act as a bleaching agent

Which one of the following compounds does not have the empirical formula CH₂O?

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Ethanoic acid, CH₃CO₂H

Ethanol, CH₃CH₂OH

Glucose, C₆H₁₂O₆

Methanal, HCHO

Which isomers of C₅H₁₁OH gives, on dehydration, the greatest number of different alkenes

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A compound of the formula C₄H₁₀O_{reacts with sodium and undergoes oxidation to give a carbonyl compound which does not reduce Tollen's reagent, the original compound is}

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Diethyl ether

n-Butyl alcohol

Isobutyl alcohol

sec-Butyl alcohol

Ionization is the process in which ionic compounds when fused or dissolved in water split up into charged particles called :

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Atoms.

Electrons.

Protons .

Ions

Who rejected the vital force theory

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Wholer

Fisher

Newton

Lewis

In the rate equation when the concentration of reactants are unity, then rate is equal to

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Instantaneous rate

Average rate

Active mass of products

Specific rate constant

Teflon, styron and neoprene are all

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Copolymers

Condensation polymers

Homopolymers

Monomers

Dehydration of ethyl alcohol yields

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Aldehyde

Ketone

Acid

Alkene

The best electrode used in salt bridge is KCl. Which other electrolyte an also be used for the purpose :

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NaCl

NH₄NO₃

KNO₃

NaNO₃

During dehydration of alcohols to alkenes by heating with conc. H₂SO₄, the initial step is

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Formation of an ester

Protonation of alcohol molecule

Formation of carbocation

Elimination of water

Iodoform test is given by:

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Formaldehyde and Higher ketones

Formaldehyde

Acetaldehyde and methyl ketones

Acetaldehyde

When a weak acid is dissolved in water or a weak base dissolved in water, then in both cases the conjugate acid base pair is produced. The ionization constants K_aand K_bof a pair are related with each other as

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K_a= K_b

K_a. K_b= K_w

K_a. K_w= K_b

K_b. K_w= K_a

The reaction of alcohol with SOCI₂in the presence of pyridine as catalyst gives

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Acids

Acid chloride

Alkyl halide

Benzene

The mass of one mole of proton is

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1.008 g

0.184 g

1.673 g

1.008 mg

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Addition Elimination

Addition Reduction

Elimination Reduction

Substitution Elimination

The next homologue of C₁₀H₂₂will be

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C₉H₂₀

C₁₂H₂₆

C₁₁H₂₄

C₁₃H₂₈

Solubility of KMnO₄at higher temperature is:

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5%

7%

15%

25%

Best way to prevent rusting of iron is by

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Making iron cathode

Putting it in saline water

Both of these

None of these

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