Short Answer Type Questions[l] [2 Marks]-Year 2015
1.Write one example of each of
(i) a metal which is so soft that, it can be cut with knife and a non-metal which is the hardest sustance.
(ii) a metal and a non-metal which exist as liquid at room temperature.
Answer.
(i) Sodium, carbon (diamond).
(ii)Mercury is liquid metal, bromine is liquid non-metal.
2.Mention the names of the metals for the following:
(i) Two metals which are alloyed with iron to make stainless steel.
(ii) Two metals which are used to make jewellary.
Answer.
(i) Nickel and chromium.
(ii) Gold and platinum.
Short Answer Type Questions[ll] [3 Marks]-Year 2015
3.State three reasons for the following facts
(i) Sulphur is a non-metal
(ii)Magnesium is a metal
One of the reasons must be supported with a chemical equation.
Answer.
4.What is cinnabar? How is metal extracted from cinnabar? Explain briefly.
Answer. Cinnabar is HgS.
Mercury is obtained by roasting cinnabar. HgO formed is thermally unstable and gives mercury.
metals-non-metals-chapter-wise-important-questions-class-10-science-2
Mercury can be purified by distillation.
5.(a) Write the electron dot structures for potassium and chlorine.
(b) Show the formation of KCl by the transfer of electrons.
(c) Name the ions present in the compound, KCl.
Answer.
metals-non-metals-chapter-wise-important-questions-class-10-science-3
6.(a)State the electron-dot structure for calcium and sulphur.
(b) Show the formation of CaS by the transfer of electrons.
