Question # 1

What is the numerical value of 'R; (the gas constant) in S.I units?

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83143 J/mole/K

Avogadro's law

83.143 J/mole/K

8.3143 J/mole/K

DNA is a polynucleic acid. The monomer is known as a nucleotide. What is not the component of the nuleotide

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Phosphate group

Deoxy ribose sugar

Uracil base

Adenine base

The temperature of the gas is raised from 27°C to 927°C the root mean square velocity is

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√927/27 times the earlier value

Same as before

Halved

Doubled

Which is not the affect of polluted air on environment

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acid rain

smog

ozone

global warming

One of the following metals is the most reactive and form super oxide. Indicate that

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Mg

K

Be

Li

How temperature affects the electrical conductivity of metals?

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Does not change at all

Decreases with increasing temperature

Increases with increasing temperature

Decreases with decreasing temperature

Plasma proteins are separated by

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Dialysis

Electrophoresis

Filtration

Alcohol precipitation

Which gases are produced from landfills?

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NH₃

H₂S

N₂

All of these

In nucleophilie substitution bimolecular reaction the order of reaction with respect to substrate

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2 order

3 order

1st order

Zero order

The chemical reactivity of glass is reduced by the use of

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fluxes

formers

stabilizers

none of the above

Ozone is most of the tropical regions acts as a pollutant and causes

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Damages to eyes

Aggravates asthma

Chest discomfort

All of these

The empirical formula of a compound is CH₂O. What may be the compound

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C₂H₅OH

C₆H₅OH

HCOOH

Smallest charge of electricity that has been measured so far is

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Charge on a-rays

Charge on electron (1.602 x 10^-19C)

Charge on x-rays

Charge on gamma rays

The ratio of moles of a particular component of solution to total moles of all components of solution is :

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Mole fraction.

Molality.

Molarity.

Normality.

A common industrial solvent is a mixture of propanone; CH₃COCH₃, and pentyl ethanoate CH₃CO₂(CH₂)₄CH₃. Which reagent would have no effect on this solvent

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Na_(s)

NaBH₄

NaOH_(aq)

2,4-dinitrophenylhydrazine reagent

Peptide bond is a key feature in

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Polysaccharide

Proteins

Nucleotide

Vitamins

Some of the elements of a period show similar behavior with the elements of next group in next period this is called

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Vertical relationship

Oblique relationship

Diagonal relationship

None

Which of the following molecules has unpaired electrons in anti-bonding molecular orbitals?

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O₂

N₂

Br₂

F₂

Which of the following enzymes brings about the hydrolysis of fats?

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Urease

Maltase

Zymase

Lypase

N₂+3H₂⇌ 2NH_{3 + Heat for above equation, themaximum product will be obtained at :}

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Low temperature at high pressure.

High temperature and low pressure.

High temperature and high pressure.

Low temperature at low pressure.

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

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The hydrocarbon used for polymerization is

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Alkanes

Alkenes

Alkynes

All of above

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