Chemistry - S.I. Units , Significant Figures , Equivalent Mass , Atomic Mass , Mole Concept And Chemical Calculations

Question - 1

0.5 mole of  Bacl2 is  mixed with 0.2  mole of  Na3PO4, the maximum number of moles of Ba3(PO4)2 that  can  be  formed is

  • A 0.01
  • B 0.10
  • C 0.30
  • D 0.50

Question - 2

71 g  of chlorine gas forms 136 g of metal chloride. The equivalent weight of  metal is 

  • A 32.5
  • B 65
  • C 97.5
  • D 130

Question - 3

50 ml of LiOH  can completely  neutralise 25 ml of 2M phoshoric acid.  The molarity of LiOH  is 

  • A 1
  • B 2
  • C 3
  • D 5

Question - 4

KMnO4, on reaction with dilute sulphric acid gives oxygen. The equivalents of oxygen produced per mole of KMnO4 is 

  • A 2
  • B 2.5
  • C 4
  • D 5

Question - 5

When 200 g of 20% solution were cooled, part of the solute precipitated; the  concentration of the solution become 12%. The mass of the precipitated substance is

  • A 16.16
  • B 17.17
  • C 18.18
  • D 19.19

Question - 6

M is molecular mass of KMnO4. When KMnO4 is changed to K2 MnO4 the equivalent mass of KMnO4 is 

  • A M
  • B M/3
  • C M/5
  • D M/7

Question - 7

w1 g of an element  directly combines  with oxygen  forming w2 g of its  oxide. The equivalent weight of the element is

  • A [(w2-w1)/ w1] x 8
  • B [w1/(w2-w1)]  x 16
  • C [w1/(w2-w1)]  x 8
  • D (w2/w1) x 8

Question - 8

Weight of 1000 ml of a gas is 0.7171 g. Molecular mass of gas is

  • A 8
  • B 16
  • C 24
  • D 32

Question - 9

For neutralising 0.183 g of a monobasic acid dissolved in water, 15 ml of N/190 NaOH were required. The  molecular mass of acid is

  • A 63
  • B 90
  • C 122
  • D 140

Question - 10

A saturated solution of potassium nitrate contains 52.4% of the salt at \({ 65 }^{ \circ }\)the solubility coefficient of the salt at this temperature is 

  • A 52.4
  • B 66.3
  • C 110
  • D 114
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