Question # 1

Two moles of an ideal gas at 1 atm are compressed to 2 atm at 273 K.The enthalpy change for the process is

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2 litre atm

1 litre atm

Zero

3 litre atm

If the distance between Na⁺ and CI^- ions in sodium chloride crystal is X pm,the length of the edge of the unit cell is

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4X om

X/4 pm

X/2 pm

2X pm

Which of the compounds cannot show positional isomerism?

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Alkanes

Alkenes

Alkynes

Alcohols

A sing chlorine free radical can destroy how many ozone molecules:

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10

100

1000

10000

The Complete oxidation of ethanol produces first Ethanal than

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Ethanal

Propanone

Ethanoic acid

Benzoic acid

Optimum PH rang for amylases is

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6 - 6.4

6.4 - 6.6

6.4 - 6.9

6.6 - 6.9

Incineration is a process in which solid waste is burned at high temperature ranging from

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500 to 600°C

900 to 1000°C

1000 to 1100°C

600 to 700°C

In the equation PV = nRT which one cannot be numerically equal to R

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8.31 x 10⁷ erg⁷ K^-1 mol^-1

8.31 x 10⁷ dynes Cm K^-1 mol^-1

8.31 JK^-1 mol^-1

8.31 L atm K^-1 mol^-1

Which is not an amino acid

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Lysine

Gylcine

Alanine

Aniline

At different temperature, the vapour pressure of water is

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different

same

low

high

The amino group in 19 alpha-amino acids is primary; only one alpha-amino acid has secondary amino group which one is that

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Alanine

Glutamic acid

Glycine

Proline

Scientific study of fermentation was first made by

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Buchner

Liebig

Biot

Pasteur

Molar mass of high molecular w.f. polymers ranges from:

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1000 to 10000

10000 to 100000

100000 to 1000000

1000 to 100000000

Which set of hybrid orbitals has planar triangle shape?

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sp³

sp

sp²

dsp²

Which isomer of C₅H₁₁OH gives, one dehydration, the greastest number of different alkenes

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Two moles of acetic acid are heated with P₂O₅the product formed is

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2 moles of ethyl alcohol

Formic anhydride

Acetic anhydride

2 moles of methyl cyanide

Cathode rays emitted from cathode are

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Canal rays

Protons

Electrons

Positrons

Which compound is both chiral and acidic

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The silver bromide in hypo (Na₂S₂O_{3) solution is}

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Soluble

Not soluble

Precipitated

Not effect

A solution of sodium sulphate was electrolysed using some insert electrodes. The products at the electrodes are

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O₂, H₂

O₂, Na

O₂, SO₂

O₂, S₂O₈²

The valence shell electronic structure of an element is ns²np⁵. The element will along to the group of

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Alkali metals

Inert metals

Noble gases

Halogen

The e.m value for positive rays maximum for:

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Oxygen.

Nitrogen.

Helium.

Hydrogen.

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