Question # 1

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

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50% KOH

5% KOH

Mg(ClO4)2

Silica gel

Mass spectrometry is used to determine the

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Number of isotopes of an element

Relative abundance of isotopes

Relative isotopic masses

All of these

When liquid solute is dissolved in liquid solvent, then the best unit of concentration is?

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% W/W

% W/V

% V/V

%V/W

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

Number of H+ ions when 0.1 mole of sulfuric acid is completely ionized in water

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4x6.022x10ê23

1×6.022x10ê23

2x6.022 x10ê23

2x6.022x10ê22

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

One mole of SO2 contains

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6.022 x 10(23) atoms of oxygen

6.022x 10 ê23 atoms of sulfur

18.1x 10 (23) molecules of SO2

4 g molecule of SO2

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

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H20

C6H6

H₂O₂

NaCl

The number of moles of CO2 which contain 16g of oxygen

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0.25

1.00

1.50

0.50

Styrene has empirical formula CH, and there is 92.2%C and 7.75% hydrogen. If molar mass is 104g mol¯, what will be integral multiple (n) to get molecular formula:

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2

4

6

8

The best concentration unit used for K⁺ ions present in potable water is

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ppm

Mole fraction

Molarity

Molality

Haemoglobin molecule is how many times heavier than helium atom

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68000 times

17000 times

,34000 times

, 1700 times

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

When we dissolve 15.8 g of KMnO4 in 1000g of H20. The solution is

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, 0.1 M

0.1 M

0.2 M

The B.P of H2O at Murree Hills is

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99.8C

98°C

100C°

89°C

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

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

Moles of protons in 20g of SO3

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10

20

40

80

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

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

Mg(s) + 2HCI(aq). ------------ MgCl2(aq)+ H2(g)

Given that; Mg=21g and HCI=21g, the excess reactant is

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Mg

HCI

Both are in stoichiometric amounts

None of these

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