Class IX

Ca on loosing 2 electrons becomes
  1. Ca-2
  2. Ca-1
  3. Ca+2
  4. Ca-2
Hair contains keratin proteins which are also present in nails and wool is an example of
  1. Biochemistry
  2. Inorganic chemistry
  3. Physical chemistry
  4. none of above
. Number of atoms of hydrogen in 2 moles of NH3
  1. 5 * 1023
  2. 3.01 * 1023
  3. 3.61 * 1024
  4. 4 * 1023
A science that examines material this universe contain and changes in them is called
  1. Chemistry
  2. Physics
  3. Biology
  4. Geography
Number of protons and neutrons in nucleus if atomic number of element is 17 and mass number is 35, is
  1. 17 and 18
  2. 17 and 19
  3. 17 and 20
  4. 17 and 21
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