Which of the following causes the rusting of iron? (a) Oxidation (b) Reduction (c) Chemical reaction with oxygen (d) Chemical reaction with C02
Option: (c)
Which of the following planets show phases like the moon?
A. Venus
B. Mercury
C. Jupiter
D. Mars
(a) A and B
(b) B and C
(c) A and C
(d) C and D
Which of the following are physical changes and which are chemical changes?
(a) Burning of a magnesium wire
(b) Freezing of water
(c) Rusting of iron
(d) Glowing of an electric bulb