Question # 1

Proxy acetyl nitrat5e (PAN) is an irritant to human beings and it affects:

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nose

stomach

eyes

ears

A gas is heated in a closed vessel. Which of the following statement is not true for the gas?

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the intermolecular forces between particles weaken

the kinetic energy of particles increases

the total internal energy of the gas remains constant

the total internal energy of the gas increases

Monosacharide belong to the group

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Fats

Carbohydrates

Lipids

Proteins

When stress is applied to the metals, the metals are malleable and ductile because

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their layers slip pass each other

atoms lose electrons

mobility of electrons increased

none of the above

The graph between pressure and volume at constant temperature for gas is:

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Isobaric

Isothermal

Isotherm

None of above

The value of general gas constant R is derived from:

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Newton's Cooling law

Maxwell's law

Avogadro's law

Charle's law

The value of R is SI units is

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0.0821 dm³. atm. J^-1mole^-1

62.4 dm³torr K^-1mole^-1

8.31 dm³atm. K^-1mole^-1

8.31 JK^-1mole^-1

The most complex strueture a single polypetide can assume is

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1° structure

2°structure

3° structure

4° structure

The structure of sodium chloride is

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simple cube

body centered cubic

face centered cubic

depends upon conditions

The most unsymmetrical one in crystal system is

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triclinic

Li, Na, K

monoclinic

hexagonal

Formula of sodium beryllite is

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Na2B4O7

Na2BeO2

BeONa

Na2B4O7 .10 H2O

Hydrolysis of alkyl nitriles gives:

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alkane

alkyl halide

alkyl nitride

carboxylic acids

Which element among the following belongs to Group IV-A of the periodic table?

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Barium

Iodine

Lead

Oxygen

Wholer prepared urea from

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Ammonia

NH₄CNO

NH₃

Uric acid

The actual number of atoms or molecules taking part in rate determining step is

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Rate of reaction

Velocity of reaction

Order of reaction

Molecularly

Prevention of corrosion of iron by Zn coating is called

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Galvanization

Cathodic protection

Electrolysis

Photoelectrolysis

An organic compound has the following properties ; It gives a positive tri-iodomethane test; it gives a yellow ppt, with 2, 4-DNP regent; it does not react with Tollen's reagent . Which compound would give these results

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CH₃CHO

CH₃CH₂OH

CH₃CH₂COCH₃

CH₃CH₂CH₂CHO

In a group, the ionization energy

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Increase

Decreases

Remain constant

First increases then decreases

Which of the following reagent cannot be used for preparing alkyl chloride from alcohol?

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HCl + anhyd. Zncl₂

NaCl

PCl₅

SOCl₂

Acetic acid is also named.

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Methanoic acid

Ethanoic acid

Propanic acid

Butanoic acid

Which one of the following compounds does not have the empirical formula CH₂O?

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Ethanoic acid, CH₃CO₂H

Ethanol, CH₃CH₂OH

Glucose, C₆H₁₂O₆

Methanal, HCHO

Alkyl halides when reduced with nascent hydrogen in the presence of Zn + HCI, are converted to

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Alkynes

Alkenes

Alkanes

Alcohol

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