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
The chemical formula of table salt
CaCl
NaCl
KCl
HCl
Impure substances are commonly called:
Mixtures
Compounds
Solutions
All of the above
We can separate soil and water from mud by the process of:
Crystallization
Decomposition
Filtration
Burning of carbon with oxygen (of air) giving carbon dioxide is an example of reaction like
Combination
Dissolution
Which is the smallest unit of an element?
Atom
Mole
Molecule
Ion
The formation of water from hydrogen and oxygen is a reaction of
Exothermic
Endothermic
Precipitation
None of the above
Copper sulphate mixed with lime is called
Bordeaux mixture
Copper sulphate pentahydrate
Copper carbonate
The symbol Au stands for
Mercury
Copper
Silver
Gold
The symbol Hg stands for
