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 one metal and one non-metal which are obtained on a large scale from sea water.
Name two metals which react with dil.HNO3 to evolve hydrogen gas
Why AL metal cannot be obtained by the reduction of AL2O3 with coke? Explain.
Zn is more electropositive than Fe. therefore, it should get corroded faster than Fe.
Assertion : when lead vessel is kept in a solution of
Reason : Lead is more electropositive than zinc.
Name any two alloys whose electrical conductivity is less than that of pure metals.
A solution of CuSO4 was kept in an iron pot. After few days, the iron pot was found to have a number of holes in it
For the reduction of metal oxide to metal, suggest a reducing agent cheaper than aluminium.
Assertion : Carbon reacts with oxygen to form carbon dioxide which is an acidic oxide.
Reason : Non-Metals form acidic oxides
In what forms are metals found in nature? with the help of examples,
Show the electron transfer in the formation of MgCL2 from its elements.
A non-metal A which is the largest constituent of air, when heated with H2 in 1:3 ratio in the presence of catalyst (Fe) gives a g..
In each test tubes A,B,C and D, 2mL of solution of Al2(SO4)3 in water was filled.
Answer the following:
(i) Name a metal
(ii) What is the nature
(iii) What is deposited at the
(iv) Will carbon monoxide
Metallic oxides of zinc, magnesium and copper were heated with the following metals:
Name the metals which are usually alloyed with gold to make it harder.
Show the formation of MgO by the transfer of electrons in the two elements using electron dot structures.
Atomic number of Mg ..
you are given a hammer, a battery, a bulb, wires and a switch.
(i) Write the electron dot structures for sodium, oxygen and magnesium.
State two ways to prevent the rusting of iron.
A reactive metal (M) is treated with H2SO4 (dil).
(i) Write the steps involved in the extraction of pure
(ii) How is copper extracted from its sulphide ore?
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?
Au, Cu, Na and ..
Which of the following metals will melt at body temperature (37Â°C).
Which of the following elements is a metal?
Give an example of a metal which
(i) Given below are the steps for extraction
(ii) Draw a neat and well labelled diagram
How is copper obtained from its ore (C..
(i) An ore, on heating in air, give sulphur dioxide gas.
(ii) State which of the following reactions will take place or which will..
Name a metal which is non-lustrous and a Non-Metal which is lustrous.
In the electrolytic refining of a metal M
Give reason for the following:
(i) Generally no hydrogen gas
(ii) Sodium hydroxide solution
(iii) Silver metal does not combine
A student puts one big iron nail each in four test tubes
Why is sodium kept immersed in kerosene oil?
Name two metals which are found in nature in the free state
Give reasons for the following:
(i) Ionic compounds have higher
(ii) sodium is kept immersed in kerosene
(iii) reaction of calcium..
An alloy is
Write the equations for the reactions of
Assertion : Food cans are coated with tin and not with zinc.
Reason : Zinc is more reactive than tin
Arrange the following metals in the decreasing order of reactivity Na, K, Cu and Ag.
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