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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.
question_answer2) Which of the following metals have low tensile strength? (a) Sodium (c) Mercury (b) Zinc (d) Both band c
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. P Q R S (a) True False True False (b) False True False False (c) True True False False (d) False False True True
question_answer4) The properties are listed in the following Table. Distinguish between metals and non-metals on the basis of these properties. Properties Metals Non-metals 1. Appearance 2. Hardness 3. Malleability 4. Ductility 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.
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. ( )
question_answer7) What happens when (a) Dilute sulphuric acid is poured on a copper plate? (b) Iron nails are placed in copper sulphate solution? Write word equations of the reactions involved
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.
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?
question_answer10) Can you store lemon pickle in an aluminium utensil? Explain.
question_answer11) Salt petre is used as (a) Fertilizer (b) insecticide (c) Fungicide (d) All the above
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.
question_answer13) Match the substances given in Column A with their uses given in Column B. A B (i) Gold (a) Thermometers (ii) Iron (b) Electric wire (iii) Aluminium (c) Wrapping Good (iv) Carbon (d) Jewellery (v) Copper (e) Machinery (vi) Mercury (f) Fuel
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