Class XI

Brass is an example of
  1. An alloy
  2. a compound
  3. a mixture
  4. An element
A pH of 7 is of
  1. Sugar solution
  2. Salt solution
  3. Weak acids and bases
  4. Both A and B
 In Universal indicators, violet color indicates
  1. Strong acids
  2. Strong alkalis
  3. Weak acids
  4. Weak bases
Greatest energy is found in particles of the
  1. Solids
  2. Liquids
  3. Gases
  4. Diffusing particles
Formula of copper carbonate is
  1. CuCO3
  2. CuCO2
  3. CuCHO3
  4. CuCOH
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