Advertisements
Advertisements
प्रश्न
The metal which is always present in an amalgam is:
(a) iron
(b) aluminium
(c) mercury
(d) magnesium
उत्तर
(c) mercury
An amalgam is an alloy of mercury with one or more metals. The combination of sodium with liquid mercury is called sodium amalgam. Amalgam of mercury with gold, silver or zinc is widely used for dental fillings.
APPEARS IN
संबंधित प्रश्न
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
Give the name and chemical formula of one ore of copper.
Name two metals which are found in nature mainly in the free state (as metallic elements).
What iron compound is present in haematite ore? Also write its chemical formula.
How is aluminium metal extracted? Explain with the help of an equation.
How are metals refined by the electrolytic methods?
Compare the properties of a typical metal and a non- metal on the basis of the following:
(a) electronic configuration
(b) nature of oxides
(c) oxidizing or reducing action
(d) conductivity of heat and electricity
Froth floatation process is generally used to concentrate ______ ores.
In electrolytic reduction of alumina _______ is used as a cathode.
Aluminium oxide is _______ oxide.
