Question # 1

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

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H20

C6H6

H₂O₂

NaCl

The molarity of 2% W/V NaOH solution is

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2

0.25

0.05

0.5

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

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

Which of the following is pure substance

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Distilled water

, Sea water

, NaCl (aq)

Brass

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

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ppm

Mole fraction

Molarity

Molality

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

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

Gram atoms of hydrogen in 5.5 g H2

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5.50

2.25

5.45

2.20

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

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

Evaporation occurs at all temperatures and is effected by

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surface area

temperature

intermolecular forces

all of these

Point out that which is not an application of liquid crystals?

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Source of energy

In display of electrical devices

For skin thermography

As temperature sensor

The largest number of molecules are present in

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3.6 g of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

How many isotopes are present in palladium

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Two

Four

Six

nine

Haemoglobin molecule is how many times heavier than helium atom

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68000 times

17000 times

,34000 times

, 1700 times

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 stoichiometric calculations for a chemical reaction results in

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Actual yield

Percentage yield

Theoretical yield

Selectivity

The B.P of H2O at Murree Hills is

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99.8C

98°C

100C°

89°C

Naturally occurring isotopes of silver are

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,Two

, Four

, Forty seven

, sixteen

Cholestryl benzoate tums into milky liquid at

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140°C

145°C

148C°

149°C

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