Advertisements
Advertisements
प्रश्न
Write the name.
Metals which are amphoteric in nature.
Advertisements
उत्तर
Metals which are amphoteric in nature- Aluminium (Al), zinc (Zn)
APPEARS IN
संबंधित प्रश्न
Why do gold ornaments look new even after several years of use?
Explain givem equation, what happens when a mixture of Cu2O and Cu2S is heated?
How is aluminium metal extracted? Explain with the help of an equation.
How is copper extracted from its sulphide ore (copper glance), Cu2S? Explain with equations of the reactions involved.
Which of the following metals are extracted by the electrolysis of their molten chlorides?
(a) Na and Hg
(b) Hg and Mg
(c) Na and Mg
(d) Cu and Fe
A sulphide ore is converted into metal oxide by the process of:
(a) carbonation
(b) roasting
(c) calcination
(d) anodising
Give the principles of electromagnetic separation.
An element has its electron configuration as 2,8,8,2. Now answer the following questions.
a) What is the atomic number of this element?
b) What is the group of this element?
c) To which period does this element belong?
How an ore is concentrated by froth floatation process?
How are metals refined by the electrolytic methods?
Name the methods by which concentrated ore is converted to metallic oxide.
Zinc sulphide : Roasting : : zinc carbonate : _______
Write the molecular formulae of the following compound.
Cryolite
Explain the concept of Roasting.
Explain concept with example/explain with the help of a balanced equation.
Roasting
Explain Bayer’s process of concentration of bauxite with a chemical equation.
The poorest conductor of heat among metals is ____________.
In thermite welding a mixture of ____________ is ignited with a burning magnesium ribbon which produces molten iron metal as a large amount of heat is evolved.
2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be
