Question # 1

The hydrocarbon with maximum B.P is

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CH4

C6H14

C4H10

C2H6

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

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

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

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

Gram atoms of hydrogen in 5.5 g H2

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5.50

2.25

5.45

2.20

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

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

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H20

C6H6

H₂O₂

NaCl

How many isotopes are present in palladium

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Two

Four

Six

nine

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

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

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)

Molecular ions are produced in mass spectrometer. Which type of molecular ion formed more abundantly.

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Negatively charged

H⁺ ions

Positively charged

equal positive and negative ions

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

The molarity of 2% W/V NaOH solution is

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2

0.25

0.05

0.5

Cholestryl benzoate tums into milky liquid at

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140°C

145°C

148C°

149°C

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

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

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

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Isotopes

isobars

Isotones

isomers

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 sole produets of combustion analysis are

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CO2 and NH3

H2O and Mg(CIO4)2

CO2 and KOH

CO2 and H2O

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