Electrolysis of water is an example of reaction like
Combination
Decomposition
Dissolution
Crystallization
A change in which no new substances are forms and which can generally be reversed by reversing the conditions is called
Physical change
Chemical change
Exothermic reaction
Endothermic reaction
The process of coating chromium or zinc on iron surface is called
Barrier protection
Rusting
Galvanization
Precipitation
The symbol Hg stands for
Mercury
Copper
Silver
Gold
A precipitate in a reaction is usually represented by an arrow
Downward
Upward
Horizontal
Diagonal
Which of the following is a testimony to the high level of skill achieved by ancient iron smiths in the extraction and processing of iron?
The Iron Pillar in Qutub Minar
The Iron Pillar in Taj Mahal
The Iron Pillar in Red fort
The Iron Pillar in Jantar Mantar
A chemical change is always.
Permanent
Temporary
Semi-permanent
different
Which is the smallest identifiable unit of a compound?
Atom
Molecule
Mole
Ion
The symbol Pb stands for
Sodium
Potassium
Iron
Lead
The chemical formula of water is
H2O
HO2
HO
H2O2
