Question # 1

The enthalpies of all elements in their standard states are

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Unity

always +ve

always -ve

zero

Oceans cove ____________ percent of the surface of the earth

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60

70

80

97

Reaction of acetic acid with LiAIH4 gives

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Ethanol

Ethanal

Ethane

Ethyl acetate

a hole used to dump the municipal wastes is called:

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landfill

effluents

leachate

inclneration

The deviation of a gas from ideal behaviour is maximum at

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-10°C and 5.0 atm

100°C and 2.0 atm

-10°C and 2.0 atm

0°C and 2.0 atm

In macromolecules DP stands for

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Dissociation parameter

Dissociation polymer

Degree of polymerization

None of these

All the following statements are incorrect except:

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all of the gases cannot be liquefied

increase of pressure will not decrease the inter molecular distance in a gas

gas molecules do not attract each other at very low temperature

actual volume of a gas is not negligible at very pressure

Which is not mineral of AI?

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Diaspore

Corrundam

Bauxite

Galena

Which of the following is not macromolecule?

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Proteins

Carbohydrates

Acrylonitirle

Lipids

Which is most acidic?

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H2O

C2H5OH

C4H9OH

CH3-CH2-CH2OH

Denaturation of protein means the structure of protein is disrupted indicate which factor does not denature protein

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oxidizing agent

heat protein

keeping pH 7.35

pH changes

Which of the following compounds will not react with sodium metal to release hydrogen

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CH₃CH₂CH₃

CH₃CH₂OH

C₆H₅OH

C₆H₅CH₂OH

Aldehydes can be distinguished from ketones by using

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Schiff's reagent

Conc. H₂SO₄

Anhy. ZnCl₂

Resorcinol

Primary and secondary alcohols on action of red hot copper give

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Aldehydes and ketones respectilvely

ketones and aldehydes respectively

Only aldehydes

Only ketones

A polymer may be

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Linear

Branched

Cross linked

All of these

In a compound an atom has negative oxidation state because

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Atom is negatively charged

Atom acts as cathode

Atom is more electronegative

Atom has lowest ionization energy

The sample being analyzed is called:

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Electrolyte

Residue

Undue

Filtrate

Solution may have units

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Molarity

Molality

Mole fraction

All of them

A species having positive or negative charge is called:

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Electron

Ion

Proton

Atom

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 of the following aqueous solutions have the lowest freezing point

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5.85% NaCI

6% urea

34.2 sucrose

All of them have same freezing points

Compound X has molecular formula C₁₀H₁₄O and is unreactive towards mild oxidising agents. What is the structure of the compound formed by dehydration of X

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