Chemistry - Chemical Equations and Stoichiometry

Question - 1

What is the equivalent weight of KMnO4 in alkaline medium? 

  • A 31.60
  • B 71.00
  • C 52.66
  • D 158.00

Question - 2

In the following reaction, 
     \({ N }_{ 2 }(g)+3{ H }_{ 2 }(g)\rightarrow 2{ NH }_{ 3 }(g)\) 
Calculate the moles of NH3 obtained when 2 moles of N2 react with 3 moles of H2 .

  • A 2 mol
  • B 4 mol
  • C 1 mol
  • D 6 mol

Question - 3

How many kilograms of CaCO3 will be required to produce 56 kg CaO, if the sample is 90% pure?

  • A 90 kg
  • B 110 kg
  • C 100 kg
  • D 111.11 kg

Question - 4

What is the mass per cent of carbon in carbon dioxide? 

  • A 0.034%
  • B 27.27%
  • C 3.4%
  • D 28.7%

Question - 5

Calculate the mass per cent of different elements in sodium sulphate.

  • A Mass % of Na = 45.0; S = 32.37; O = 22.57
  • B Mass % of Na = 32.37; S = 22.57; O = 45.0
  • C Mass % of Na = 22.57; S = 45.0; O = 32.37
  • D Mass % of Na = 32.37; S =45.0; O = 22.57

Question - 6

What is the percentage of gold in 20 carat gold?

  • A 80
  • B 95
  • C 38.56
  • D 83.33

Question - 7

2 moles of BaCl2 react with 2 mole of Na3PO4 according to the reaction \(3BaC{ l }_{ 2 }+2N{ a }_{ 3 }{ PO }_{ 4 }\rightarrow { Ba }_{ 3 }{ \left( { PO }_{ 4 } \right) }_{ 2 }+6NaCl\) Calculate the maximum amount of Ba3(PO4)2 obtained.

  • A 0.13 mol
  • B 0.55 mol
  • C 0.24 mol
  • D 0.667 mol

Question - 8

If 0.56 g of a gas occupies 280 cm3 at STP, then what is the molecular mass of that gas?

  • A 4.8
  • B 44.8
  • C 2
  • D 22.4

Question - 9

How much of oxygen (in L) is required for the complete oxidation of 1.5 moles of sulphur into sulphur dioxide at STP?

  • A 11.2
  • B 22.4
  • C 33.6
  • D 44.8

Question - 10

If 500 mL of a 5 M solution is diluted to 1500 mL, what will be the molarity of the solution obtained? 

  • A 1.5 M
  • B 1.66 M
  • C 0.017 M
  • D 1.59 M
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