Advertisements
Advertisements
Question
_______ is the least reactive metal.
Options
silver
sodium
zinc
gold
Solution
Gold is the least reactive metal.
APPEARS IN
RELATED QUESTIONS
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
Why does a new aluminium vessel lose shine so soon after use?
Explain why, carbon cannot reduce oxides of sodium or magnesium.
What is the difference between a mineral and an ore?
Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) rock salt
Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
(a) Al2O3 + Fe
(b) MnO2 + Al
(c) Fe2O3 + Al
(d) Cu2O + Fe
The metal which can be extracted simply by heating the cinnabar ore in air is:
(a) Zn
(b) Cu
(c) Al
(d) Hg
An element A which is a part of common salt and kept under kerosene reacts with another element B of atomic number 17 to give a product C. When an aqueous solution of product C is electrolysed then a compound D is formed and two gases are liberated.
(a) What are A and B?
(b) Identify C and D.
(c) What will be the action of C on litmus solution? Why?
(d) Write formula of the compound formed when element B reacts with an element E having atomic number 5.
Name a non- metal that has a metallic luster and sublimes on heating.
State the property of the metal being utilized in the following :
Use of metal | Property |
Zinc in Galvanization | |
Aluminium in Thermite welding |
Which one of the following is not true of metal :
Metals are good conductors of electricity.
Name the following:
A steel grey coloured solid non-metal.
Aluminium oxide is _______ oxide.
Write the name.
The molecular formula of main ore of aluminium –
Write the name.
The process of extraction of aluminium from alumina-
Explain Bayer’s process.
Which of the following metals exist in their native state in nature?
- Cu
- Au
- Zn
- Ag
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
During extraction of metals, electolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?