Question # 1

Which is a good nucleophile as well as a good leaving group?

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F-

Cl-

Br-

I-

Change in enthalpy (∆H) of a system can be calculated by

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∆H=∆E - PV

ΔH =ΔE +q

∆H = ∆E - q

∆Η = ΔΕ + P∆V

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will

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remain unchanged

increase four times

reduce to 1/4

be doubled

Increased concentration of enzyme alkaline phosphatase is a sign of

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hemophilia

heart disease

thrombosis

rickets

The measurement of enthalpy change at standard conditions means that we should manage the measurement at

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24°C at 1 atm

25°C at 1 atm

0C° at 1 atm

100C° 1 atm

Elements of group IV-A are

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neither strongly electropositive nor strongly electronegative

strongly electropositive

strongly electronegative

none of these

Which one is a non-polar compound?

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SnCl2

PH3

Gecl4

H2O

Amount of product formed increases with time, this statement is true for reactions-------with kinetics

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1s order

3rd order

zero order

Any order

The reagent for alkaline hydrolysis of ethyl bromide to form ethyl alcohol is

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water at room T

Alcoholic KOH+heat

Ethanol + heat

dil. NaOH+ heat

Graham s law refers to

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Boiling point of gases

Gas compression problems

Gaseous diffusion

Volume changes of gases due to change in temperature

1 gram molecule refers to amount in grams

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Equivalent to 1 mole of an atom

Equivalent to 1 mole of a molecule

Equivalent to 1 mole of an ionic species

Of an ionic compound

In diamond, the carbon atoms are arranged in a

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tetrahedral manner

hexagonal manner

square planar manner

octahedral manner

Which of the following compound is least reactive

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HCHO

CH3CHO

CH3COCH3

C6H5CHO

Observed pressure of gas on the walls of container is less than actual pressure due to

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Hephazard motion

Inter molecular attractive forces

Elastic collision

Repulsive forces

Which of the following elements is most metallic

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Bi

sb

As

P

Which element is expected to show the greatest tendency to form some covalent compounds?

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aluminium

calcium

magnesium

sodium

Stronger is the oxidizing agent, stronger is the

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emf of cell

Oxidation potential

Reduction potential

Which compounds is alicyclic in nature?

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Cyclobutane

Iso-bstand

n-Butane

Toluend

Among the following, which one is nucleophile

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H+

Ca2+

OH-

Na+

Enzymes are

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simple proteins

derived proteins

compound proteins

conjugated proteins

pH of an aqueous solution is 3.0 at 25°C. The hydrogen ion concentration in the solution would be

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0.001

0.01

0.0001

10(-5)

The original volume of a gas at 0° is 273 cm³at constant pressure, its volume at 273°C becomes

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zero cm³

546 cm³

446 cm³

346 cm³

Which is an intermediate in SN1 reaction

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Ethoxide ion

Carbocation

alkyl halide

alkene

If absolute temperature of a gas is doubled and pressure is reduced to one half, then the volume of the gas will

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remains unchanged

increases unchanged

reduces to 1/4

increases 4 times

Number of moles present in 0.6 gram of silica is (Atomic mass Si = 28, O=16)

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0.01 mole

0.064 mole

0.044 mole

0.054 mole

Which of the following is an example of body centred cube?

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Magnesium

Zinc

Copper

Sodium

The study of which one of the followings guides to the mechanism of the reaction

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Order of reaction

Rate of reaction

Half-life period of reaction

Rate determining step

The value of van der Waal s constant a for gases CO₂, N₂, and SO₂, are 3.59 ,1.39, 1.36, and 6.17 atm dm⁶ mol^-2respectively the gas which can be most easily liquefied is

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CO₂

O₂

N₂

SO₂

∆H=∆E is true for which of the following reaction

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K+H2O----->KOH+H2

N2+3H2------>2NH3

AlCl3+3NaOH--->Al(OH)3+3 NaCl

4Na + O2----->2Na2O

Which of the following statement about graphite is not true?

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The coordination number of carbon atoms is 4.

the carbon atoms are arranged layers.

the layers in graphite are attracted to each other weak forces.

the corbon atoms use only three of their four outer electrons for covalent bonding.

Which set of elements is good loser of electrons

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F2. Cl2, Br2

N, P. As

O. S, Se

Li, Na, K

The major binding force of diamond,silicon and quartz is

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Electostatic force

Electical attraction

Ceobalent bond force

Non convalent bond force

According to the general gas equation, density of an ideal gas depends upon

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Pressure

Temperature

Molar mass of the gas

All of the above

Which of the folowing compound is expected to be colored

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Na2SO4

ZnCl2

MgF₂

CuF₂

The enthalpy of formation of a compound is

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Positive

Either positive or negative

Negative

None

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 of the following compound have empirical formula, but no molecular formula

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H20

C6H6

H₂O₂

NaCl

Liquids are less common than:

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Solids.

Plasmas.

Gases.

All of above.

Which of the following has no hydrogen-bonding

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Diethyl ether

Water

Ethyl alcohol

Phenol

H₂and O₂are enclosed in porous vessel. The effusion of these gases will take place like

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H₂effuses 4 times the rate of effusion of O₂

O₂effuses into air 4 times the effusion of H₂

both effuse at same rate

H₂effuses at 8 times the rate of effusion of O₂

In an electrochemical series, elements are arranged on the basis of

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pH scale

pKa scale

pOH scale

Hydrogen scale

Lactoglobulin is found in

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nucleus

nerve cells

Plants only

muscles and in plants