Choose the correct option
1. Which one of the following group comprise of elements ?
a. Mercury, water, Ammonia
b. Iodine, Tin, Iron
c. Copper, Aluminium, Methane
d. Coal, Smoke, Fog
Answer = b
2. Which one of the following can be broken down into simpler substances ?
a. Ammonia
b. Oxygen
c. Sulphur
d. Iron filling
Answer = a
3. The gram molecular mass of HNO3 is _____
a. 60
b. 100
c. 63
d. 98
Answer = c
4. Which of these molecules is not a compound ?
a. N2O
b. N2
c. NO
d. NO2
Answer = b
5. Which one of the following is equal to 2 moles of water ?
a. 084 × 10²⁵ molecules
b. 022 × 10²³ molecules
c. 204 × 10²⁴ molecules
d. 806 × 10²⁴ molecules
Answer = c
6. A compound contains :
a. Different kinds of atoms mixed together
b. The same kind of atoms mixed together
c. Different kinds of atoms chemically combine together
d. The same kind of atoms chemically combined together
Answer = c
7. Which one of the following is an example of triatomic molecule ?
a. CO2
b. O2
c. CH4
d. NH3
Answer = a
8. Hydrogen gas is :
a. A monoatomic gas
b. A mixture of hydrogen atoms
c. A diatomic gas with each molecule made up of two atoms
d. A diatomic atom made up of to molecules
Answer = c
9. Which one of the following compounds has both empirical and molecular formula identical ?
a. Benzene (C6H6)
b. Hydrogen peroxide (H2O2)
c. Water (H2O)
d. Glucose (C6H12O6)
Answer = c
10. Which one of the following is a homogeneous mixture ?
a. Smoke
b. Air
c. Fog
d. Smog
Answer = b
Read related articles. Click here
