NDA Chemistry - Periodic Classification of Elements

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Question - 1

Second group elements are called --------------------

  • A alkail
  • B alkaline earth metals
  • C transition elements
  • D minor transition elements

Question - 2

Number of groups in modern periodic table is-------------

  • A 7
  • B 17
  • C 18
  • D 8

Question - 3

An amalagam is an alloy of metal with

  • A carbon
  • B mercury
  • C hydrogen
  • D gold

Question - 4

The percentage of purity of gold is calculated for making ornaments.

  • A \(\frac { 24 }{ 22 } \times 100\)
  • B \(\frac { 22 }{ 22 } \times 100\)
  • C \(\frac { 20 }{ 22 } \times 100\)
  • D \(\frac { 18 }{ 22 } \times 100\)

Question - 5

Atomic number of iron is 26.Its electronic configuration is

  • A 2,8,8,2
  • B 2,8,8,4
  • C 2,8,14,2
  • D 2,8,14,4

Question - 6

Bauxite is used to extract aluminium it can be termed as

  • A ore
  • B Mineral
  • C flux
  • D Slag

Question - 7

Elements of group 3 to  12 in the long form of periodic of table are called.

  • A representative elements
  • B transition  elements
  • C inner transition  elements
  • D inert gases

Question - 8

Any metal mixed with mercury is called----------------

  • A Alloy 
  • B Solution
  • C Amalgam
  • D Salt

Question - 9

To design the body of the aircraft-----alloy are used

  • A Iron
  • B Gold
  • C Silver
  • D Aluminium

Question - 10

A process employed for the concentration of sulphide ore is --------------

  • A Gravity separation
  • B Froth floatation
  • C Magnetic separation
  • D Chemical method
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