Free Education for All
Last Updated on By Mrs Shilpi Nagpal 1 Comment
Question 1 Name one metal which has a low melting point? Question 2 Name two metals which are malleable and ductile? Question 3 Name one soft metal that can be cut with knife? Question 4 Name the metal which is the poorest conductor of heat? Question 5 Why copper and aluminium metals are used for making electric wires? Question 6 Why copper and aluminium metals … [Read more...] about Metals
Last Updated on By Mrs Shilpi Nagpal Leave a Comment
Question 1 What happens when metals react with chlorine? Question 2 What happens when metals react with hydrogen? Reaction of metal with chlorine Metals react with chlorine to form ionic chlorides. 2Na(s) + Cl2 (g) -----> 2 NaCl(s) Ca (s) + Cl2 (g) -----> CaCl2 Mg (s) + Cl2 (g) ----> MgCl2 Reaction of metals with hydrogen Most of the metals do … [Read more...] about Reaction of metal with chlorine and hydrogen
Last Updated on By Mrs Shilpi Nagpal 4 Comments
Question 1 What is an alloy? Question 2 Give two examples of alloys? Question 3 How are the properties of an alloy different from those of the constituent metals? Question 4 What elements are present in steel? Question 5 What are the constituents of stainless steel? Question 6 State an alloy of copper? Question 7 Give the constituent of brass? Question 8 … [Read more...] about Alloys
Last Updated on By Mrs Shilpi Nagpal 7 Comments
Question 1 Define the term corrosion? Question 2 What is meant by rusting of iron? Question 3 State the conditions necessary for rusting of iron? Question 4 State the ways to prevent the rusting of iron? Question 5 Name the metal used for galvanising iron? Question 6 Why copper objects lose their shine after sometime? Question 7 Why silver articles became … [Read more...] about Corrosion
Last Updated on By Mrs Shilpi Nagpal 1 Comment
Question 1 What is meant by refining of metals? Question 2 Define the term electrolytic refining? Question 3 How will you refine copper by electrolytic refining? Refining The process of purifying impure metal is called refining of metal. The most important and most widely used method for refining impure metals is called electrolytic refining. Many metals like … [Read more...] about Refining
Last Updated on By Mrs Shilpi Nagpal Leave a Comment
Question 1 Name one ore of mercury and zinc? Question 2 Give the chemical formula of ore of iron and copper? Question 3 Name one metal which is extracted by reduction with carbon? Question 4 Name one metal which is extracted by electrolytic reduction? Question 5 Name one metal which is extracted by reduction with aluminium? Question 6 How is copper extracted from … [Read more...] about Conversion of ore into metal
Last Updated on By Mrs Shilpi Nagpal 2 Comments
Question 1 Why most of the metals do not occur as free elements? Question 2 What are minerals? Question 3 Define the term ore? Question 4 Define the term metallurgy? Question 5 Define the term extraction? Question 6 Name the three steps of metallurgy? Question 7 What is gangue? Question 8 What do you mean by concentration of ore? Occurrence of Metals … [Read more...] about Occurrence of Metals-concentration of ore
Last Updated on By Mrs Shilpi Nagpal 2 Comments
Question 1 Define covalent bond? Question 2 Why non-metals form covalent bond? Question 3 What is a single covalent bond.Give example? Question 4 What is a double covalent bond.Give example? Question 5 What is a triple covalent bond.Give example? Question 6 Give few properties of covalent compounds? Covalent bond The chemical bond formed by sharing of … [Read more...] about Covalent bond
Last Updated on By Mrs Shilpi Nagpal 2 Comments
Question 1 Define the term ionic bond? Question 2 Explain the formation of sodium chloride by electron transfer? Question 3 Give few properties of ionic compounds? Question 4 Why ionic compounds do not conduct electricity in solid state? Ionic Bond Ionic bond is formed by transfer of electrons from one atom to another. In this one atom can donate electrons to … [Read more...] about Ionic Bond
Last Updated on By Mrs Shilpi Nagpal Leave a Comment
Question 1 Name one non-metal which is used to preserve food materials? Question 2 Name one non-metal which is used to make electrodes of dry cell? Question 3 Name one non-metal which is used in the manufacture of sulphuric acid? Uses of Non-metals 1)Hydrogen is used in the hydrogenation of vegetable oil to make vegetable ghee,manufacture of ammonia. 2)Liquid … [Read more...] about Uses of Non-metals