Question # 1

In order to determine ∆H (latt) of ionic compound which is correct relationship

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∆H latt. = ∆Hf - ∆Hx

∆H latt. = ∆Ha + ∆Hv

∆H latt. = ∆Hf + ∆Hx

∆H latt. = ∆Hf - ∆H sol.

The conc.of dissolved molecular oxygen in water which act as the most important oxidizing agent ranges from:

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2ppm- 6ppm

4ppm--8ppm

2ppm--- 4ppm

2ppm --3ppm

Chloroform (CHCl3) is?

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Primary alkyl halide

Secondary alkyl halide

Tertiary alkyl halide

a liquid

Per hydro cyclopentano phenathrene is the basic structure of all the:

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Proteins

vitamins

waxes

amines

R = 0.08205:

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atm dm³mol^-1k^-1

J mole^-1k^-1

Nm mol^-1k^-1

cal. mol^-1k^-1

Plastics are a pollution problem because may plastics:

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burn to produce toxic fumes

decompose to produce tocxic products

are made from petroleum

are very inflammable

The volume of gas depends upon the------- moleules

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Size of

Space between

Molecular weight

both a and b

what is it difficult to cook food at high as compared to at sea level? Choose the correct reason.

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H-bonding in H₂O changes with height

temperature at the top of mountain is low

density of water decreases at the mountain

boiling point of water decreases at the mountain

At STP,a container has 1 mole of Ar,2 moles of CO₂,3 moles of O₂ and 4 moles of N₂.Without changing the total pressure if one mole of O₂ is removed,the partial pressure of O₂

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Is changed by about 26%

Is halved

Is unchanged

Change by 33%

Daily protein intake for normal adults should be

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0.2 g/kg

0.5 g/kg

0.8 g/kg

1.1 g/kg

The number of Cl- ions per unit cell of NaCl are

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6

4

2

8

Which of the following orbitals have a dumb bell shape?

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s

p

d

f

Carbon monoxide is harmful to human beings as it

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Is carcinogenic

Is antagonistic to CO₂

Has higher affinity for hemoglobin as compared to oxygen

Is destructive to O₃

Which is the chain isomer of n-pentane

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Isopentane

Neopentene

N-pentene

Isopentene

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At equilibrium there is no further change in the concentration of Hl

At equilibrium concentration of l₂remains constant

At equilibrium concentration of H₂remains unaltered

At equilibrium the rate of formation of Hl is equal to the rate of decomposition of Hl

In carboxyl group the bond between C and oxygen is:

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Sigma bond

Single bond

Double Bond

Triple bond

Identify the hydrocarbon formed, when ethyl bromide reacts with, alcoholic KOH at 100°

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Methane

Ethane

Ethene

Ethyne

The shape of CIO^-₃according to valence shell electron pair repulsion theory will be

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Planar triangle

Pyramidal

Tetrahedral

Square planar

Which among the following species has the highest ionization energy?

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Ne

F

Li

B

Which of the following solution has the highest boiling point

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5.85% solution of sodium chloride

18.0% solution of glucose

6.0% solution of urea

All have the same boiling point

In KO₂the oxidation state of oxygen is

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-2

-1

+1/2

-1/2

Which of the following is a member of -block

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Zn

Al

B

Br

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