For the reduction of metal oxide to metal, suggest a reducing agent cheaper than aluminium.
Why AL metal cannot be obtained by the reduction of AL2O3 with coke? Explain.
State two ways to prevent the rusting of iron.
Give an example of a metal which
Why is sodium kept immersed in kerosene oil?
Name one metal and one non-metal which are obtained on a large scale from sea water.
Show the formation of MgO by the transfer of electrons in the two elements using electron dot structures.
Atomic number of Mg ..
In what forms are metals found in nature? with the help of examples,
(i) Write the steps involved in the extraction of pure
(ii) How is copper extracted from its sulphide ore?
Assertion : when lead vessel is kept in a solution of
Reason : Lead is more electropositive than zinc.
Answer the following:
(i) Name a metal
(ii) What is the nature
(iii) What is deposited at the
(iv) Will carbon monoxide
In each test tubes A,B,C and D, 2mL of solution of Al2(SO4)3 in water was filled.
you are given a hammer, a battery, a bulb, wires and a switch.
Write equations for the reactions of
Give reason for the following:
(i) Generally no hydrogen gas
(ii) Sodium hydroxide solution
(iii) Silver metal does not combine
(i) Given below are the steps for extraction
(ii) Draw a neat and well labelled diagram
How is copper obtained from its ore (C..
Name two metals which will displace hydrogen from
Differentiate between metals and non metals
Explain the meanings of malleable and ductile
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:
What is anode mud?
Name the metals which are usually alloyed with gold to make it harder.
Give reasons for the following:
(i) Ionic compounds have higher
(ii) sodium is kept immersed in kerosene
(iii) reaction of calcium..
Which of the following methods is suitable for
An element reacts with oxygen to give a compound
A man went door to door posing as a goldsmith
Give reasons, why copper is used to make hot water tanks and not steel
An alloy is
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?
Au, Cu, Na and ..
A green layer is gradually formed on a copper plate when left exposed to air for a week in a bathroom. What could this green subst..
Name any two alloys whose electrical conductivity is less than that of pure metals.
Name an alloy that contains a non-metal as one of its constituents.
Explain what happens if bauxite containing iron and silica as impurities is directly subjected to the peocess of electrolytic redu..
Hydrogen is not a metal but it has been assigned a place in the reactivity series of metals. Explain.
An electrolytic cell consist of
Write the equations for the reactions of
Food cans are coated with tin and not with zinc because
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