JEE Questions for Chemistry Some Basic Concepts Of Chemistry Quiz 8 - MCQExams.com

Given, that the abundances of isotopes 54 Fe, 56 Fe and 57 Fe are 5%, 90% and 5%, respectively, the atomic mass of Fe is
  • 55.85
  • 55.95
  • 55.75
  • 56.05
A bivalent metal has an equivalent mass of 32. The molecular mass of the metal nitrate is
  • 182
  • 168
  • 192
  • 188
The percentage of an element M is 53 in its oxide of molecular formula M2O3 . Its atomic mass is about
  • 45
  • 9
  • 18
  • 36
  • 27
An unknown element forms an oxide. What will be the equivalent weight of the element if the oxygen content is 20% by weight?
  • 16
  • 32
  • 8
  • 64
An alkaloid contains 17.28% of nitrogen and it's molecular mass is 162. The number of nitrogen atoms present in one molecule of alkaloid is
  • 5
  • 4
  • 3
  • 2
Of two oxides of iron, the first contained 22% and the second contained 30% of oxygen by weight. The ratio of weights of iron in the two oxides that combine with the same weight of oxygen, is
  • 3 : 2
  • 2 : 1
  • 1 : 2
  • 1 : 1
1.520 g of hydroxide of a metal on ignition gave 0.995 g of oxide. The equivalent weight of metal is
  • 1.52
  • 0.995
  • 190
  • 9
The formula mass of Mohr's salt is 392. The iron present in it, is oxidised by KMnO4 in acidic medium. The equivalent mass of Mohr's salt is
  • 392
  • 31.6
  • 278
  • 156
Camphor is often used in molecular mass determination because
  • it is readily available
  • it has a very high cryoscopic constant
  • it is volatile
  • it is solvent for organic substances
What is the equivalent weight of SnCl2 in the following reaction
Chemistry-Some Basic Concepts of Chemistry-7448.png
  • 95
  • 45
  • 60
  • 30
If molecular weight of KMnO4 is M , then its equivalent weight in acidic medium would be
  • M
  • 2)
    Chemistry-Some Basic Concepts of Chemistry-7450.png

  • Chemistry-Some Basic Concepts of Chemistry-7451.png

  • Chemistry-Some Basic Concepts of Chemistry-7452.png
74.5 g of a metallic chloride contains 35.5 g of chlorine, the equivalent weight of the metal is
  • 19.5
  • 35.5
  • 39
  • 78.0
3 g of an oxide of a metal is converted to chloride completely and it yielded 5 g of chloride. The equivalent weight of the metal is
  • 33.25
  • 3.325
  • 12
  • 20

Chemistry-Some Basic Concepts of Chemistry-7456.png

  • Chemistry-Some Basic Concepts of Chemistry-7457.png
  • M
  • 2M

  • Chemistry-Some Basic Concepts of Chemistry-7458.png
A gas is found to have a formula [CO]x. Its vapour density is 70, the x is
  • 3.0
  • 3.5
  • 5.0
  • 6.5
4 g of copper was dissolved in concentrated nitric acid. The copper nitrate solution on strong heating gave 5 g of its oxide. The equivalent weight of copper is
  • 23
  • 32
  • 12
  • 20

Chemistry-Some Basic Concepts of Chemistry-7462.png
  • 158
  • 31.6
  • 39.5
  • 79

Chemistry-Some Basic Concepts of Chemistry-7464.png
  • 18
  • 68
  • 34
  • 17

Chemistry-Some Basic Concepts of Chemistry-7466.png
  • be a function of the molecular mass or the substance
  • remain unchanged
  • increase two fold
  • decrease twice
The equivalent weight of a certain trivalent element is 20. Molecular weight of its oxide is
  • 152
  • 56
  • 168
  • 68
An organic compound on analysis was found to contain 10.06% carbon, 0.84% hydrogen and 89.10% chlorine. What will be the empirical formula of the substance?
  • CH2Cl2
  • CHCl3
  • CCl4
  • CH3Cl
If two compounds have the same empirical formula but different molecular formulae, they must have
  • different percentage composition
  • different molecular weights
  • same viscosity
  • same vapour density
In a compound C, H and N are present in 9 : 1 : 3.5 by weight. If molecular weight of the compound is 108, then the molecular formula of the compound is
  • C2H6N2
  • C3H4N
  • C6H8N2
  • C9H12N3

Chemistry-Some Basic Concepts of Chemistry-7471.png
  • C5H14
  • C10H8
  • C15H12
  • C20H16
  • C15H20
A compound contains 69.5%. oxygen and 30.5% nitrogen and its molecular weight is 92. The formula of the compound is
  • N2O
  • NO2
  • N2O4
  • N2O5
The empirical formula of a compound is CH2. One mole of this compound has a mass of 42 g. Its molecular formula is
  • C3H6
  • C3H8
  • CH2
  • C2H2
An organic compound has an empirical formula (CH2O), its vapour density is 45. The molecular formula of the compound is
  • CH2O
  • C2H5O
  • C2H2O
  • C3H6O3
10 g of sample of mixture of CaCl2 and NaCl is treated to precipitate all the calcium as CaCO3. This CaCO3 is heated to convert all the Ca to CaO and the final mass of CaO is 1.62 g. The per cent by mass of CaCl2 in the original mixture is
  • 32.1%
  • 16.2%
  • 21.8%
  • 12.0%
2.76 g of silver carbonate on being strongly heated yields a residue weighing
  • 3.54 g
  • 3.0 g
  • 1.36 g
  • 2.16 g

Chemistry-Some Basic Concepts of Chemistry-7478.png
  • 20
  • 40
  • 60
  • 80
0:0:1


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