31. Which molecules is not a compound?
(a) H20
(b) N2
(c) NO
(d) NO2
answer
(b) N2
32. A compound contains?
(a) Different kinds of atoms mixed together
(b) The same kind of atoms mixed together
(c) Different kinds of atoms chemically combined together
(d) The same kind of atoms chemically combined together
answer
(c) Different kinds of atoms chemically combined together
33. Hydrogen gas is the?
(a) A mono atomic gas
(b) A mixture of hydrogen atoms
(c) A diatomic gas with, each other molecule made up, of two toms
(d) A diatomic atom made up of two molecules
answer
(c) A diatomic gas with, each other molecule made up, of two toms
34. Which is a homogeneous mixture?
(a) Smoke
(b) Air
(c) Fog
(d) Smog
answer
(b) Air
35. Which of the following compounds has a same molecular and empirical formula?
(a) Benzene
(b) Water
(c) Hydrogen peroxide
(d) Glucose
answer
(b) Water
36. Which is composed of a very small particles?
(a) Atoms
(b) Compound
(c) Element
(d) None of these
answer
(a) Atoms
37. The Atom is an:?
(a) Divisible particle
(b) Both of these
(c) Indivisible particle
(d) None of these
answer
(c) Indivisible particle
38. Atom can neither be:?
(a) Created
(b) Destroyed
(c) Both of these
(d) None of these
answer
(c) Both of these
39. What of the following has a negative charge?
(a) Electron
(b) Neutron
(b) Proton
(d) None of these
answer
(a) Electron
40. Which of the following is a positively charged particle?
(a) Electron
(b) Neutron
(c) Proton
(d) None of these
answer
(c) Proton
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