Tag: general knowledge

Graphite

Silica

Iron Oxide

Diamond

Argon

Xenon

Helium

Krypton

oxygen and hydrogen

oxygen, hydrogen, acetylene and nitrogen

oxygen, acetylene and argon

oxygen and acetylene

osmosis

deliquescence

efflorescence

desiccation

Making cement and glass

Disinfecting water of ponds

cutting very hard substances

Making casts for statues

3%

3.5%

2.5%

2%

without any change in the weight of the nail

with decrease in the weight of the nail

with increase in the weight of the nail

without any change in colour or weight of the nail

lead

chromium

zinc

tin

coke is the hardest, graphite is the softest

diamond is the hardest, coke is the softest

diamond is the hardest, graphite is the softest

diamond is the hardest, lamp black is the softest

transition metals

main group metals

alkali metals

rare metals