Metals

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…

Reaction of metal with chlorine and hydrogen

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…

Alloys

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…

Corrosion

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?…

Refining

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…

Conversion of ore into metal

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…

Occurrence of Metals-concentration of ore

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…

Covalent bond

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…

Ionic Bond

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…

Uses of Non-metals

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…

Chemical properties of non-metals

Question 1 What happen when carbon react with oxygen? Question 2 What happen when sulphur react with oxygen? Reaction Of Non-Metals with oxygen Non-Metals react with oxygen to form acidic oxides or neutral oxides. Carbon form an acidic oxide carbon dioxide. Sulphur form an acidic oxide sulphur dioxide. Hydrogen form a neutral oxide water. The acidic…

Uses of Metals

Question 1 Name the metal which is used in making thermometers? Question 2 Name the metal which are used in making electric wires? Question 3 Name three metal which are used in atomic energy? Question 4 Name the metal which are used in making jewellery? Question 5 Name the metal which are used in making house hold utensils? Uses…

Reaction of metal with salt solution

Question 1 In a solution of silver nitrate,a copper plate is dipped.Which metal is more reactive-copper or silver? Question 2 A solution of copper sulphate was kept in an iron pot.After few days ,the iron pot was found to have number of holes in it.Write the equation of the reaction that took place? Question 3…

Reaction of metals with dilute acids

Question 1 Name the metal which has been placed at the top of reactivity series? Question 2 Name the metal which has been placed at the bottom of reactivity series? Question 3 Which of the two metals is more reactive:Copper or silver? Question 4 What happens when sodium react with HCl? Question 5 What happens when…

Reaction of Metals with water

Question 1 What happens when potassium react with water? Question 2 What happens when sodium react with water? Question 3 What happens when aluminium react with water? Question 4 What happens when zinc react with water? Reaction of Metals with water Metals react with water to form hydroxide,hydrogen gas and heat is evolved. 2K +2H2O ———-> 2KOH + H2…

Reaction of metals with oxygen

Question 1 Why sodium and potassium are stored under kerosene oil? Question 2 Give equation for reaction of sodium with oxygen? Question 3 Give equation for reaction of potassium with oxygen? Question 4 What happens when sodium oxide reacts with water? Question 5 What happens when potassium oxide reacts with water? Question 6 What are amphoteric oxides?…

Non-Metals

Question 1 Name one non-metal which conduct electricity? Question 2 Name one non-metal which have shiny surface? Question 3 Name one non-metal which is hard? Question 4 Name one non-metal having high melting point? Question 5 Why graphite is used in making electrodes? Question 6 Name one non-metal which is brittle? Question 7 Name one non-metal which has low melting…