#Stay_Ahead of your Class
Listen NCERT Audio Books to boost your productivity and retention power by 2X.
Name one metal and one non-metal that exists in liquid state at room temperature.
Why metals can act as reducing agents while non-metal cannot?
What type of oxides are formed by:
(a) Metals
(b) Non-metals?
Name two non-metals which are lustrous.
Name two metals:
(a) which have very low melting points,
(b) which are so soft that they can be cut with a knife.
(a) which are best conductors of heat,
(b) which are comparatively poor conductors of heat.
What is meant by malleability? Name two most malleable metals.
What is meant by ductility? Name two most ductile metals.
Name two metal oxides which are:
(a) water soluble
(b) insoluble in water.
What is meant by anodising? Why is it done?
Write the electron-dot structure for Na and Cl atoms. How do these form a chemical bond? Name the type of bond so formed. Why does a compound so formed have high melting point?
Differentiate between metals and non-metals with respect to their chemical properties.
Differentiate between roasting and calcination.
Define the following terms:
(a) Alloy
(b) Corrosion.
What happens when:
(a) iron reacts with steam?
(b) calcium and potassium are put in water?
Show the formation of:
(a) MgO
(b) Na2O by the transfer of electrons.
Why do ionic compounds:
(a) are hard and solids?
(b) conduct electricity in their aqueous solution form or molten state?
How are the following metals reduced:
(a) Metals which are highly reactive?
(b) Metals which are in the middle of the reactivity series?
How you will obtain the following metals:
(a) mercury from cinnabar?
(b) Copper from its ore copper glance?
(a) manganese dioxide is heated with aluminium powder?
(b) iron (III) oxide is heated with aluminium powder?
How will you extract metal M from its enriched sulphide ore, if M is in the middle of the reactivity series? Write various steps used in extracting this metal.
What is a reactivity series? Describe an activity to develop a reactivity series.
How electrolytic refining of copper is carried out? Explain in detail.
Define the following:
(a) Amalgam
(b) Ore
(c) Mineral.
What is meant by corrosion? How corrosion is caused? How it can be prevented? What is the effect of corrosion on:
(a) copper?
(b) silver?
(a) Make a flowchart to explain the various steps involved in the extraction of metals from ores.
(b) Give four characteristics of ionic compounds.
OR
Give reasons only:
(a) Na, K and Li are stored under oil.
(b) Pt, Au and Ag are used to make jewellery.
(c) Hydrogen gas is not evolved when metals react with nitric acid.
(d) Aluminium is a reactive metal, yet it is used to make utensils for cooking.
(e) Aqueous copper sulphate solution should not be stored in an iron container.
Which of the following pairs will give displacement reactions?
Which of the following methods is suitable for preventing an iron frying pan from rusting?
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:
Food cans are coated with tin and not with zinc because:
The electrical conductivity and melting point of an alloy is:
Brass is an alloy of:
Solder is an alloy of lead and tin. It has a:
Galvanisation is a method of protecting:
The metals which are mixed with iron to make stainless steel are:
Bronze is an alloy of:
Which of the following metals are obtained by electrolysis of their chlorides in molten state?
(i) Na (ii) Ca
(iii) Fe (iv) Cu
Which among the following statements is incorrect for magnesium metal?
An electrolytic cell consists of:
(i) Positively charged cathode
(ii) Negatively charged anode
(iii) Positively charged anode
(iv) Negatively charged cathode
During electrolytic refining of zinc, it gets:
An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following:
Which one of the following properties are not generally exhibited by ionic compounds?
Which of the following metals exist in their native state in nature?
(i) Cu
(ii) Au
(iii) Zn
(iv)Ag
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?
(i) Au (ii) Cu
(iii) Na (iv) K
Silver articles become black on prolonged exposure to air. This is due to the formation of:
Galvanisation is a method of protecting iron from rusting by coating with a thin layer of:
Write true or false for the following statements:
Non-metals react with acids to give a salt and hydrogen gas.
At ordinary temperature, the surfaces of metals such as magnesium, aluminium, zinc, lead, etc., are covered with a thin layer of oxide which protects the metal from further oxidation.
Iron does not burn on heating but iron filings burn vigorously when sprinkled in the flame of the burner.
Copper does not burn in air, but the hot metal is coated with a black coloured layer of copper (II) oxide.
Silver and gold react with oxygen at high temperatures.
Hydrogen gas is evolved when a metal reacts with nitric acid.
Copper reacts vigorously with dilute HCl.
A solution of an ionic compound in water contains ions, which move to the opposite electrodes when electricity is passed through the solution.
The elements or compounds, which occur naturally in the earth’s crust, are known as minerals.
Those minerals which contain a very high percentage of a particular metal and from which metal can be profitably extracted are called ores.
