Advertisements
Advertisements
Question
Find the odd one out and give its explanation.
Options
Na
K
Cu
Li
Solution
Cu
Explanation-
Copper (Cu) is a less reactive metal while others are highly reactive metals.
APPEARS IN
RELATED QUESTIONS
What chemical process is used for obtaining a metal from its oxide?
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
In which cases will you find displacement reactions taking place?
Name one metal which is extracted by reduction with carbon.
How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.
Give the name and chemical formula of one ore of copper.
A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.
(a) Name the metal and write its chemical symbol.
(b) Write the name and formula of the sulphide ore.
(c) Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
(d) Name a common device in which this metal is used.
(e) Can this metal displace copper from copper sulphate solution? Why?
When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation of a layer of substance B. When an object made of another metal C is kept in damp air for a considerable time, it gets covered with a green layer of substance D. Metal A is the best conductor of electricity whereas metal C is the next best conductor of electricity.
(a) What is metal A?
(b) What is metal C?
(c) Name the substance B.
(d) Name the substance D.
Give reasons, why aluminum is used in:
making alloys
Define the term : Flux
How an ore is concentrated by froth floatation process?
Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.
Name the following:
A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.
Usually ______ ores are subjected to ______ which is done in the absence of air.
Aluminium oxide is _______ oxide.
Zinc sulphide : Roasting : : zinc carbonate : _______
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
Observe the figure and answer the following.
- Write the name of the method.
- What is used as anode and cathode in this method?
- Write the molecular formula and use of cryolite.
- Write anode reaction.
- Write cathode reaction.
An alloy is
Electrical wires have a coating of an insulting material. The material, generally used is
Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2. What steps will you take to convert them into metals?
