Question # 1

Which of the following is the use of electrolysis?

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Eletrorefining

Electroplating

Both A and B

None of the above

Methanol and ethanol can be distinguished by

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Iodoform test

Iucas test

Dichromate/H₂SO₄oxidation test

Flame test

Compounds X, Y and Z, all react with PCI₅to release hydrogen chloride, but only one of them reacts eith 2,4-dinitrophenylhydrazine reagent. Which one of the following combinations could be X, Y and Z

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The specific conductance of a 0.1 N KCl solution at 23°C is 0.012 ohm^-1cm^-1. The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be

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0.142 cm^-1

0.66 cm^-1

0.916 cm^-1

1.12 cm^-1

The compound which gives oxygen on moderate heating is

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Zinc oxide

Mercuric oxide

Aluminium oxide

Ferric oxide

What is the total number of different chloroethanes of formula C₂H_6-nCl_npossible (n may be 1 to 6)

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6

8

9

10

Mottling of teeth is due to presence of an element in drinking water

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Mercury

Fluorine

Boron

Chlorine

Which substances haveΔH =ΔE

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Solids

Liquids

Gases

Liquids and solids

A compound used as eye wash:

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Borax

Boric acid

Metabolic acid

Pyroboric acid

Hybridization of each carbon atom in benzene ring is

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sp hybridized

sp²hybridized

sp³

dsp²

A carboxylic acid containing Ar group in it is called:

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Aromatic carboxylic acid

Allphatic carboxylic acid

Dicarboxylic acid

Carboxylic acid

Aledehydes ketones can be prepared form alcohols by their:

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Reduction

Oxidation

Decomposition

Synthesis

A compound X contains 50% sulphur and 50% oxygen by mass. What is the empirical formula of compound X?

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SO

SO₂

SO₃

SO₄

The reduction potential to copper electrode is +0.34 V and that of Zn electrode is -0.76 V. when these two are coupled the e.m.f. of the cell is

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-0.42 V

+0.42

-1.10 V

+1.10 V

Which statement is not correct

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Enzymes catalyst a specific reaction

Enzymes show catalytic activity at a specific temperature

The catalytic activity of enzymes is stopped if optimum pH is changed

The catalytic activity is poisoned by a co-enzymes

All the elements of oxygen family are

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Non metals

Metalloids

Radioactive

Polymorphic

Among the lanthandes the one obtained by synthetic method is

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Lu

Pm

Pr

Gd

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Small change in concentration of product

Small time internal

Co-efficient of the reactant

Co-efficient of the product

H-bonding is not present in

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Glycerine

Water

Hydrogen sulphide

Hydrogen fluride

Which is not a calcareous material

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Lime

Clay

Marble

Marine shell

Which compound was recognized the parent member of aromatic compounds

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Aniline

Phenol

Benzene

Toluene

Which of the following was discovered first:

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Charge to mass ratio of electrons.

Mass of electrons.

Charge of electrons.

All of above at same time.

Azimuthal quantum number of last electron of ₁₁Na is

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1

2

3

0

Mark the correct statement

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Na⁺is smaller than Na atom

Na⁺is larger than Na atom

Cl^-is the smaller than Cl atom

Cl^-(ion) and Cl (atom) are equal in size

Proton was discovered by:

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Chadwick

J.J. Rhomson

Millikan.

Goldstein.

Al³⁺is a symbol for aluminium

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Atom

Ion

Cation

Anion

Hydrocarbons are organic compounds which contain elements such as

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Hydrogen

Carbon

Hydrogen and carbon

Halogens

Similarity in properties of different organic compounds give rise to the under standing of ______

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Polymerization

Non-polar nature

Homologous series

Isomerism

Vinegar is dilute solution of:

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Acitic acid

Formic acid

Butyric acid

Propionic acid

Major food factors are:

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Fats and oils

Carbohydrates

Protiens

All of these

Formalin is:

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10% solution of formaldehyde in water

20% solution of formaldehyde in water

40% solution of formaldehyde in water

60% solution of formaldehyde in water

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