Question # 1

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 stoichiometric calculations for a chemical reaction results in

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Actual yield

Percentage yield

Theoretical yield

Selectivity

Evaporation occurs at all temperatures and is effected by

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surface area

temperature

intermolecular forces

all of these

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

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

Moles of protons in 20g of SO3

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10

20

40

80

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

How many grams of NaOH are present in 250 cm3 of its 0.2M solution

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,4 g

, 0.4 g

, 10 g

, 2 g

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

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0.25

1.00

1.50

0.50

The height of the peak in the mass spectrum shows

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Number of isotopes

Relative abundance

Mass number

Number of protons

The B.P of H2O at Murree Hills is

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99.8C

98°C

100C°

89°C

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 is pure substance

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Distilled water

, Sea water

, NaCl (aq)

Brass

Cholestryl benzoate tums into milky liquid at

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140°C

145°C

148C°

149°C

Gram atoms of hydrogen in 5.5 g H2

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5.50

2.25

5.45

2.20

Which of the following contains I mole of the stated particles

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Chlorine molecules in 35.5 g of chlorine gas

Electrons in 1 g of hydrogen gas

Hydrogen ions in 1 dm³ of 1 mol dm¯³ aqueous sulfuric acid

Oxygen atoms in 22.4 dm³ of oxygen gas at STP

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

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

Haemoglobin molecule is how many times heavier than helium atom

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68000 times

17000 times

,34000 times

, 1700 times

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

Naturally occurring isotopes of silver are

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,Two

, Four

, Forty seven

, sixteen

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