Class X

By which reaction metal is obtained from metal oxide ?
  1. Liquefaction
  2. Reduction
  3. Calcination
  4. Roasting
Which of the following is not a half-metal?
  1. silicon,
  2. boron,
  3. arsenic
  4. chlorine
atom is In general the number of electrons in the outermost shell of a metal
  1. 1
  2. 1 to 3
  3. 5 to 8
  4. 8
. Which of the is more reactive?
  1. Hg
  2. Al
  3. Ag
  4. Ca
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.
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