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Created on April 01, 2022 By Preptestsonline

Chemistry MCQs Set 6

1 / 15

Isotopes of the same elements has__________________?

different number of protons

same number of neutrons

different number of neutrons

same mass number (nucleon number)

2 / 15

Which of the following is not a macromolecule ?

sand

haemoglobin

diamond

maltose

3 / 15

Mostly elements have fractional atomic masses because of______________________?

Mass of an atom itself is in fraction

Atomic masses are average masses of isobars

Atmoic masses are average masses of isotopes proportional to their relative abundance

Atmoic masses are average masses of isotopes

4 / 15

Percentage of calcium in calcium carbonate is___________________?

80%

30%

40%

20%

5 / 15

How many isotopes have odd atomic number ?

154

280

86

300

6 / 15

The number of moles of CO2 which contains 16 g of oxygen is__________________?

0.25

0.5

0.75

1

7 / 15

The volume occupied by 2.8 g of N2 at STP______________________?

2.24 dm3

22.4 dm3

1.12 dm3

112 dm3

8 / 15

Which one of the following has the maximum number of isotopes ?

oxygen

carbon

tin

chlorine

9 / 15

moles of each aluminium and oxygen react with each other to produce aluminium oxide. The amount of product formed is______________________?

0.18 mole

0.27 mole

0.24 mole

0.09 mole

10 / 15

Which of the following terms is not used for ionic compound ?

formula unit

empirical formula

molecular formula

formula mass

11 / 15

The number of isotopes of elements with even mass number and even atomic number are ________________?

280

300

154

54

12 / 15

One mole of CO2 contains?

6.022 x 1023 atoms of oxygen

22-gram electrons

6.022 x 1023 atms of carbon

both B. & C.

13 / 15

Which of the following statements about isotopes is correct ?

Isotopes with odd atomic number are abundant

Isotopes with odd atomic number and even mass number are abundant

Isotopes with even atomic number and even mass number are abundant

Isotopes with even atomic number and odd mass no are abundant

14 / 15

Molecular mass of water (18g) means__________________?

1-mole molecules of water

1-gram molecule of water

3-gram atoms

all

15 / 15

Empirical formula of chloroform is____________________?

CH2 C12

CH3C1

CC14

CHCL3

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