Question # 1

The sole produets of combustion analysis are

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CO2 and NH3

H2O and Mg(CIO4)2

CO2 and KOH

CO2 and H2O

CO2 and SO2 are both triatomic molecules, but heat of vaporization of SO2 is greater than that of CO2. This is due to

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greater electronegative character of sulphur

greater size of SO2 molecule

SO2 is polar and CO2 is non-polar

SO2 is more acidic in nature than CO2

The molarity of 2% W/V NaOH solution is

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2

0.25

0.05

0.5

The value of the vapour pressure of water at its boiling point at Karachi and Murree is

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same

different

depends upon the environmental conditions in both cities

greater at Murree and less at Karachi

1 gram formula refers to

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Amount in grams equivalent to 1 mole of a atom

Amount in grams equivalent to 1 mole of a covalent compound

Amount in grams equivalent to 1 mole of a ionic compound

Amount in grams equivalent to 1 mole of an ion

During combustion analysis, which one is used for absorbing carbon dioxide:

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50% KOH

5% KOH

Mg(ClO4)2

Silica gel

In s solution 7.8 g of benzene ( C6H6 ) and 46g of toluene (C6H5CH3) is present. The mole fraction of toluene is

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1/3

1/5

2/3

5/6

Combustion analysis is performed for the determination of

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Molar mass of the compound

Empirical formula of the compound

Structural formula of the substance

Mass of halogens present in organic compounds

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

The stoichiometric calculations for a chemical reaction results in

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Actual yield

Percentage yield

Theoretical yield

Selectivity

250cm of 0.2 molar potassium sulphate solution is mixed with 250cm of 0.2 molar KCI solution. The molar concentration of K ions is:

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0.2 molar

0.25 molar

0.3 molar

0.35 molar

Naturally occurring isotopes of silver are

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,Two

, Four

, Forty seven

, sixteen

How many electrons have to be removed to ionize 1.0 x 10(-6) moles of Ne atoms to Ne+ ions in a neon advertising tube:

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6.02x10ê23/1.0x10ê-6

1.0x 10ê-6 x 6.02x 10ê23

1.0x10ê-6 x 6.02×10ê23/20.2

1.0x10ê-6 x 6.02x10ê23/9.65x10ê-1

Which of the following is pure substance

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Distilled water

, Sea water

, NaCl (aq)

Brass

The hydrocarbon with maximum B.P is

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CH4

C6H14

C4H10

C2H6

If empirical formula of a compound is CH2 and its molecular mass is 56amu. What will beits molecular formula

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CH2

C3H6

C2H4

C4H8

The height of the peak in the mass spectrum shows

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Number of isotopes

Relative abundance

Mass number

Number of protons

Glycerine is a polar compound. It boils at 290°C under one atmospheric pressure. It should be distilled under reduced pressure due to reason that

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there are strong intermolecular forces between molecules of glycerine

it decomposes at 290°C

low pressure makes the liquid to boil at high temperature

the reduced pressure decreases the boiing point of liquids

6Na+ Fe2O3 -------- 3 Na2O+2Fe For above reaction, if you are provided with 230g Na and 320g Fe2O3, then limiting reactant is

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, Na

Na2O

Fe2O3

none of these

Which of the following is a limitation of balanced chemical equation

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Conditions and rate of reactions

Physical state and mechanism

Reactants and products and their coefficients

Both (a) and (b)

What s the boling point of H2O at the peak of Mount Everest?

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101 C°

69°C

100 C°

98° C

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