ATOMS AND MOLECULES

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ATOMS AND MOLECULES

By - Gowthamraj. V, Marwar Boys Higher Sec. School - Acharapakkam. - 7010900331

Name *

School Name with District Name *

Which of the following has the smallest mass? *

1 point

a) 6.023 × 10^23 atoms of He

b) 1 atom of He

c) 2 g of He

d) 1 mole atoms of He

Which of the following is a triatomic molecule? *

1 point

a) Glucose

b) Helium

c) Carbon dioxide

d) Hydrogen

The volume occupied by 4.4 g of CO2 at S.T.P *

1 point

a) 22.4 litre

b) 2.24 litre

c) 0.24 litre

d) 0.1 litre

Mass of 1 mole of Nitrogen atom is *

1 point

a) 28 amu

b) 14 amu

c) 28 g

d) 14 g

Which of the following represents 1 amu? *

1 point

a) Mass of a C - 12 atom

b) Mass of a hydrogen atom

c) 1/12th of the mass of a C – 12 atom

d) Mass of O – 16 atom

Which of the following statement is incorrect? *

1 point

a) One gram of C -12 contains Avogadro’s number of atoms.

b) One mole of oxygen gas contains Avogadro’s number of molecules.

c) One mole of hydrogen gas contains Avogadro’s number of atoms.

d) One mole of electrons stands for 6.023 × 1023 electrons

The volume occupied by 1 mole of a diatomic gas at S.T.P is *

1 point

a) 11.2 litre

b) 5.6 litre

c) 22.4 litre

d) 44.8 litre

In the nucleus of 20_Ca^40, there are *

1 point

a) 20 protons and 40 neutrons

b) 20 protons and 20 neutrons

c) 20 protons and 40 electrons

d) 40 protons and 20 electrons

The gram molecular mass of oxygen molecule is *

1 point

a) 16 g

b) 18 g

c) 32 g

d) 17 g

1 mole of any substance contains ____ molecules. *

1 point

a. 6.023 × 10^23

b. 6.023 x 10^-23

c. 3.0115 x 10^23

d. 12.046 x 10^23

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