Class X

Which of the following is NOT True for metals?
  1. Generally metals are malleable.
  2. Generally metals are malleable.
  3. Metals are good conductors of heat.
  4. Metals are electronegative by nature
Food cans are coated with tin and not with zinc because
  1. zinc is costlier than tin.
  2. zinc has a higher melting point than tin.
  3. zinc is more reactive than tin
  4. ) zinc is less reactive than tin.
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
  1. calcium
  2. carbon
  3. silicon
  4. iron.
Which of the following is the best electrical conductor?
  1. Gold
  2. Silver
  3. Copper
  4. Aluminium
Which of the following methods is suitable for preventing an iron frying pan from rusting?
  1. Applying grease
  2. Applying paint
  3. Applying a coating of zinc
  4. All of the above.
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