Ores and Mineral
Arrange the following elements in the order of their abundance in Earth's crust:
Aluminium - Al, Silicon - Si, Oxygen - O, Iron - Fe.
Calamine is an ore of
The chemical name of main ore of iron is ___.
- Zinc blende
Minerals from which metals are extracted are called:
The things made up of aluminum develop an Al2O3 layer. It acts as a protective layer. But iron oxide layer does not behave like this. Why? Explain
Haematite and magnetite are ores of:
Reason: Low active metals can be reduced easily by heating.
Which of the following holds true?
- Both Statement and Reason are true but Reason is not the correct explanation for Statement.
- Only Statement is true but the Reason is false.
- Only Reason is true but the Statement is false.
- Both Statement and Reason are true and Reason is the correct explanation for Statement.
Name the most common ore of the metal Aluminum from which the metal is extracted. Write the chemical formula of the ore.
(i) Ferric oxide to iron
(ii) Aluminium hydroxide to aluminium oxide
(iii) Aluminium to aluminium nitride
(iv) Aluminium to sodium aluminate
Ores mined from the earth are usually contaminated with large amounts of impurities known as _______.
Are humans made of stardust?
Which of the following metals are available in free or native state?
Zinc and copper
Iron and copper
Carbon and zinc
Graphite and carbon
The ___ reactive metals occur in nature in the free form.
(c) Copper pyrite
Which of the following is not an ore of Iron?
Name the following:
The ore of zinc, containing its sulfide.
The most abundant metal in the earth's crust is___.
- an oxide
- a tin-plated metal
- an alloy of lead
- an amalgam of mercury
write the chemical equation of the following :
1. aluminium and hydrogen
2. a non metal ( except sodium) and chlorine.
3. a non metal ( except hydrogen ) and oxygen .
Salts that are least likely to be found in minerals are:
All ores are minerals whereas all minerals are not ores.