The chemical symbol for sodium is
  • So
  • Sd
  • NA
  • Na
Which of the following would weigh the highest?
  • 0. 2 mole of sucrose (C
  • 2 moles of CO
  • 2 moles of CaCO
  • 10 moles of H
Which of the following correctly represents 360 g of water?
  • (i)
  • (i) and (iv)
  • (ii) and (iii)
  • (ii) and (iv)
42 g of sucrose are dissolved in 18 g of water in a beaker. The number of oxygen atoms in the solution are
  • 6. 68 × 10
  • 6. 09 × 10
  • 6. 022 × 10
  • 6. 022 × 10
A change in the physical state can be brought about
  • only when energy is given to the system
  • only when energy is taken out from the system
  • when energy is either given to, or taken out from the system
  • without any energy change
The relative molecular mass of Na2S2O3.5H2O is
  • 250 amu
  • 250 g
  • 248 amu
  • 248 g
5H
  • 250 amu
  • 250 g
  • 248 amu
  • 248 g
Which of the following has maximum number of atom?
  • 18 g H
  • 18 g of O
  • 18 g of CO
  • 18 g of CH
Percentage of calcium in calcium carbonate is
  • 40
  • 30
  • 48
  • 36
Which has maximum number of molecules?
  • 1 g of CO
  • 1 g of N
  • 1 g of H
What mass of carbon dioxide (CO2) will contain 3.011 × 1023 molecules?
  • 11. 0 g
  • 22. 0 g
  • 4. 4 g
  • 44. 0 g
The value of Avogadro’s constant is:
  • 6. 0 × 10
  • 6. 01 × 10
  • 6. 022 × 10
  • 6. 022 × 100
How many times an atom of sulphur is heavier than an atom of carbon?
  • 32 times
  • 12 times
  • 8/3 times
  • 12/32 times
Which of the following represents 12 u?
  • Mass of 1 hydrogen atom
  • Mass of C-12 atom
  • Mass of 0-16 atom
  • 1/12th of mass of C-12 atom.
The molecule having an atomicity of 4 is:
  • Sulphate molecule
  • Ozone molecule
  • Phosphorus molecule
  • Methane molecule
Which of the following has maximum number of atoms?
  • 18 g of H
  • 18 g of O
  • 18 g of CO2
  • None of the above
0 h : 0 m : 1 s

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