Question # 1

Cholestryl benzoate tums into milky liquid at

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140°C

145°C

148C°

149°C

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

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 sole produets of combustion analysis are

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CO2 and NH3

H2O and Mg(CIO4)2

CO2 and KOH

CO2 and H2O

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

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

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

Moles of protons in 20g of SO3

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10

20

40

80

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

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H20

C6H6

H₂O₂

NaCl

The stoichiometric calculations for a chemical reaction results in

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Actual yield

Percentage yield

Theoretical yield

Selectivity

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

Naturally occurring isotopes of silver are

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,Two

, Four

, Forty seven

, sixteen

The B.P of H2O at Murree Hills is

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99.8C

98°C

100C°

89°C

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

The hydrocarbon with maximum B.P is

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CH4

C6H14

C4H10

C2H6

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

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

Atoms having same mass number but different atomic numbers are called.

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Isotopes

isobars

Isotones

isomers

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

Which of the following is not the property of liquid crystal

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anisotropic

isotropic

three dimensional arrangement

fluidity

Which of the following is pure substance

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Distilled water

, Sea water

, NaCl (aq)

Brass

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