question_answer1) Statement A: Metals lose electrons to form positive ions. Statement B: Nonmetals possess lusture, are malleable and ductile. Statement C: Metals have 4 to 8 electrons in their outermost shell. Non-metals have 1 to 3 electrons in their outermost shell. (a) Statements A and B are correct, statement C is incorrect. (b) Statement A is correct, statements B and C are incorrect. (c) All the three statements are correct. (d) All the three statements are incorrect.View Answer play_arrow
question_answer3) State true or false. (P) All metals react with other substances to form chemical compounds. (Q) All the elements having one electron in their outermost shell are metals. (R) Metals are good reducing agents. (S) Nonmetals are good oxidizing agents.
|5. Heat Conduction|
|6. Conduction of Electricity|
question_answer5) Fill in the blanks: (a) Phosphorus is a very _____ non-metal. (b) Metals are _____ conductors of heat and_____. (c) Iron is _____ reactive than copper. (d) Metals react with acids to produce ___ gas.View Answer play_arrow
question_answer6) Mark 'T if the statement is true and 'P? if it is false. (a) Generally, non-metals react with acids. ( ) (b) Sodium is a very reactive metal. ( ) (c) Copper displaces zinc from zinc sulphate solution. ( ) (d) Coal can be drawn into wires. ( )View Answer play_arrow
question_answer8) Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. (a) How will she find the nature of the gas? (b) Write down word equations of all the reactions taking place in this process.View Answer play_arrow
question_answer9) One day Reeta went to a jeweller's shop with her mother. Her mother gave an old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?View Answer play_arrow
question_answer12) Give reasons for the following. (a) Aluminium foils are used to wrap food items. (b) Immersion rods for heating liquids are made up of metallic substances. (c) Copper cannot displace zinc from its salt solution. (d) Sodium and potassium are stored in kerosene.View Answer play_arrow
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