Read and download free pdf of CBSE Class 10 Science Chemistry Metals and Non Metals Assignment. Get printable school Assignments for Class 10 Chemistry. Standard 10 students should practise questions and answers given here for Chemistry in Grade 10 which will help them to strengthen their understanding of all important topics. Students should also download free pdf of Printable Worksheets for Class 10 Chemistry prepared as per the latest books and syllabus issued by NCERT, CBSE, KVS and do problems daily to score better marks in tests and examinations
1 MARK QUESTIONS :
Question. Name the following:
i) The most abundant metal in the earth crust.
ii) The only non-metallic element which exists as a liquid.
iii) The process by which a metallic oxide ore changes into metal.
iv) Minerals which can be profitably converted to metals.
Question. Show the electronic transfer in the formation of following :
i) Sodium oxide
ii) Calcium Hydride
ii) (Magnesium chloride ( At.Nos. Na=11 , O=8 , Ca=20 , H=1 , Mg=12 , Cl=17 )
Question. Swasti took sulpher powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it, as shown in the figure.
(a) What will be the action of gas on
(i) Dry litmus paper?
(ii) Moist litmus paper?
(b) Write a balanced chemical equation for the reaction taking place?
Ans. (a) (i) no action on dry litmus paper (ii) moist litmus paper becomes re as the reaction taking place.
(b) Balanced equation for the reaction taking place:
S + O2 —-→ SO2
Question. What is amphoteric oxide? Give examples.
Ans. Those oxides which reacts with acids as well as bases to produce salts and water are called amphoteric Oxides. E.g. Na2O, ZnO etc.
Question. State reason for the following:
(i) Lemon is used for restoring the shine of tarnished copper vessels’
(ii) Copper wires are used in electrical connections.
Ans. (i) when a copper object remains in damp air for a considerable time, the copper reacts slowly with Caron dioxide and water in air to form a green coating of basic copper carbonate on its surface. If corroded copper vessels are treated with lemon which is acidic in nature, the acid solution dissolves Green color basic copper carbonate and makes them look shiny.
(ii)Copper metal is the next best conductor of electricity after silver metal. So electric wires are made of copper.
Question. Classify the following compounds into ionic & molecular compounds.
( Fe2O3 , CO2 , Mg3N3 , NH3 , Li2O , K3N , HCl(g) , C6H12O6 , 3 , HCl (aq), CaO )
Question. Name a non-metal which is lustrous and a metal which is non-lustrous.
Ans. Iodine is a non-metal which is lustrous and lead is a non-lustrous metal.
Question. Give reasons:
i) Metals can be given different shapes according to our needs.
ii) Hydrogen is not evolved when a metal reacts with nitric acid.
iii) Aluminium oxide is considered as an amphoteric oxide.
iv) Ionic compounds conduct electricity in molten state.
v) Gold and silver are used to make jewellery.
Question. Why does calcium float in water ?
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