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..
Assertion : Hydrogen is not a metal but it has been
Reason : Hydrogen has a tendency to lose electron
Name two metals which react with dil.HNO3 to evolve hydrogen gas
Name the process used for the concentration of the sulphide ore.
Assertion : when lead vessel is kept in a solution of
Reason : Lead is more electropositive than zinc.
Which of the following metal will not give H2(g) with H2O?
Name one metal and one non-metal which are obtained on a large scale from sea water.
Why AL metal cannot be obtained by the reduction of AL2O3 with coke? Explain.
In what forms are metals found in nature? with the help of examples,
For the reduction of metal oxide to metal, suggest a reducing agent cheaper than aluminium.
Zn is more electropositive than Fe. therefore, it should get corroded faster than Fe.
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
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
Show the electron transfer in the formation of MgCL2 from its elements.
Metallic oxides of zinc, magnesium and copper were heated with the following metals:
Name any two alloys whose electrical conductivity is less than that of pure metals.
(i) Write the electron dot structures for sodium, oxygen and magnesium.
Show the formation of MgO by the transfer of electrons in the two elements using electron dot structures.
Atomic number of Mg ..
Name the metals which are usually alloyed with gold to make it harder.
you are given a hammer, a battery, a bulb, wires and a switch.
State two ways to prevent the rusting of iron.
Give an example of a metal which
(i) Write the steps involved in the extraction of pure
(ii) How is copper extracted from its sulphide ore?
A reactive metal (M) is treated with H2SO4 (dil).
(i) Given below are the steps for extraction
(ii) Draw a neat and well labelled diagram
How is copper obtained from its ore (C..
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 elements is a metal?
In the electrolytic refining of a metal M
A student puts one big iron nail each in four test tubes
Name two metals which are found in nature in the free state
An alloy is
(i) An ore, on heating in air, give sulphur dioxide gas.
(ii) State which of the following reactions will take place or which will..
Which of the following metals will melt at body temperature (37Â°C).
Why is sodium kept immersed in kerosene oil?
Give reason for the following:
(i) Generally no hydrogen gas
(ii) Sodium hydroxide solution
(iii) Silver metal does not combine
What type of oxides are formed when
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