Question # 1

Which of the following is not correct about transition metals?

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Their melting and boiling points are high

Their compounds are generally coloured

They can form ionic or covalent compounds

They do not exhibit variable valency

The detection of functional group is called :

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Numerical analysis.

Qualitative analysis.

Combustion analysis.

Quantitative analysis.

Ketones are prepared by the oxidation of:

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Primary alcohol

Secondary alcohol

Tertiary alcohol

None of these

The value of charge on electron is

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1.602 x 10^-19coulombs

1.602 x 10^-18coulombs

1.602 x 10^-17coulombs

1.602 x 10^-16coulombs

B.O.D is connected with

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Organic matter

Microbes

Mircrobes and organic matter

None of the above

Odour of alkene is:

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Fruity

Odourless

Zarlic like

Irritating

How much of NaOH is required to neutralize 1500 cm³of 0.1 N HCl?

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60 g

6 g

4 g

40 g

In a group IIA from top to bottom as the atomic number increases, there is regular decreases in

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Ionic size

Atomic size

Ionization potential

None of these

A colourless liquid, at room temperature reacts with soda lime to form sodium salt of carboxylic acid and ammonia gas. The liquids is

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Propanamide

Propanoic acid

Formamide

Methyl Ethanoate

Alkene general formula :

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C_nH_2n+2

C_nH_2n

C_nH_2n-2

C_nH_2n+1

How many isomeric disubtituted products are obtained by the introducing of second group in the ring

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Two

Three

Four

None

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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When acetylene is passed through a copper tube at 300°C, it polymerizes to

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Polyacetylene

polyethylene

Benzene

None of these

Aldehydes and ketones are carbonyl compounds. Which of them react both with NaBH₄and with Tollen's reagent

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Both aldehydes and ketones

Aldehydes only

Ketones only

Neither aldehydes nor ketones

Where energy is released during a reaction it is

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Exothermic reaction

Endothermic reaction

A free radical reaction

A bond breaking reaction

Which of the following will have the highest boiling point?

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Methanal

Ethanal

Propanal

2-Hexanone

10g of NaOH has been dissolved per kg of solvent. The molality of solution is :

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.25 m

1.5 m

.5 m

2.5 m

Terylen fibre is made by reaction of terephthalic acid with

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Ethylene

Ethylene glycol

Glycol

Terylene

The nature of interparticle forces in benzene is

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Dipole-dipole interaction

Dispersion force

Ion-dipole interaction

H-bonding

Ifα us the degree of dissociation of Na₂SO₄the vant Hoff's factor (1) used for calculating the molecular mass is

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1 +α

1 -α

1 + 2α

1 - 2α

The term ebullioscopy is used for

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Depression of freezing point

Elevation in boiling point

Lower of vapour pressure

None of the above

In which of the following pairs, the numbers of electrons in the outermost shell are different?

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As,Sb

Ge,Sn

In,pt

Se,Te

Cannizzzaro's reaction is not given by:

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Formaldehyde

Acetaldehyde

Benzaldehyde

Trimethyl

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

Sterols, vitamin D and terpenese belong to

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Simple lipids

Complex lipids

Derived lipids

None

In a lime kiln, to get higher yield of CO₂, the measure that can be taken is

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To main high temperature

To pump out CO₂

To remove Cao

To add more CaCO₃

Activity of the enzyme is reduced by

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Temperature

Concentration

pH

Inhibitors

The theory of chemical bonding has been a major problem of:

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Modern Physics.

Modern Chemistry.

Modern Biology.

Mechanics.

The temp. and pressure used for PVC polymerization is

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10°C and 10 atm

20°C and 20 atm

52°C and 9 atm

100°C and 10 atm

95% ethanol is called:

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Rectified other

Diesel

Rectified spirit

Petrol

Which bond shows maximum hydrogen bonding with water?

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CH₃OH

C₂H₅OH

CH₃----O----CH₃

C₆H₅OH

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