Question # 1

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

Evaporation occurs at all temperatures and is effected by

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surface area

temperature

intermolecular forces

all of these

Cholestryl benzoate tums into milky liquid at

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140°C

145°C

148C°

149°C

Water may boil at 120 °C when external pressure is:

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100 mm of Hg

700 mm of Hg

760 mm of Hg

1489 mm of Hg

5604 cm3 of H2 gas at STP contains atoms of hydrogen

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6.02×10 (23)

2.6x10(22)

3.01x10(23)

1. 50x 10(23)

Naturally occurring isotopes of silver are

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,Two

, Four

, Forty seven

, sixteen

To cook the food at a high mountain is difficult as compared to at sea level. The reason is that:

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the temperature at the top of the mountain is low

the density of water decreases at the mountains

the boiling point of water decreases at the mountain

the hydrogen bonding in water changes with the change of height

Moles of protons in 20g of SO3

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10

20

40

80

The molarity of 2% W/V NaOH solution is

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2

0.25

0.05

0.5

The stoichiometric calculations for a chemical reaction results in

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Actual yield

Percentage yield

Theoretical yield

Selectivity

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