Question # 1

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

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

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Isotopes

isobars

Isotones

isomers

Glycerine is a polar compound. It boils at 290°C under one atmospheric pressure. It should be distilled under reduced pressure due to reason that

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there are strong intermolecular forces between molecules of glycerine

it decomposes at 290°C

low pressure makes the liquid to boil at high temperature

the reduced pressure decreases the boiing point of liquids

The height of the peak in the mass spectrum shows

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Number of isotopes

Relative abundance

Mass number

Number of protons

Haemoglobin molecule is how many times heavier than helium atom

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68000 times

17000 times

,34000 times

, 1700 times

Cholestryl benzoate tums into milky liquid at

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140°C

145°C

148C°

149°C

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)

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

The hydrocarbon with maximum B.P is

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CH4

C6H14

C4H10

C2H6

How many isotopes are present in palladium

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Two

Four

Six

nine

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

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

Which of the following is not the property of liquid crystal

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anisotropic

isotropic

three dimensional arrangement

fluidity

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

When we dissolve 15.8 g of KMnO4 in 1000g of H20. The solution is

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, 0.1 M

0.1 M

0.2 M

Gram atoms of hydrogen in 5.5 g H2

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5.50

2.25

5.45

2.20

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

The molarity of 2% W/V NaOH solution is

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2

0.25

0.05

0.5

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

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

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