SI unit of molality is -

  • mol kg–1

  •  Nm–1

  •  mol L–1

  •  Unitless

The significant figures present in the answer of the following calculations
is-
\(\frac{2.5 \times 1.25 \times 3.5}{2.01}\)
  • 3
  • 1
  • 2
  • 0
The average atomic mass of hydrogen using the following data is -
: Isotope   % Natural abundance   Molar mass
  1H               99.985                             1
  2H               0.015                              2
 
  •   1.00015 u
  •   1.015 u
  •   1.0015 u
  •   1.0005 u
Calcium carbonate reacts with aqueous HCl to give CaCl2 and CO2 according to the reaction given below:
CaCO3 (s) + 2HCl (aq) → CaCl2(aq) + CO2(g) + H2O(l)
The mass of CaCl2  formed when 250 mL of 0.76 M HCl reacts with 1000 g of CaCO3   will be -
  • 2.06 g
  • 20.6 g
  • 1.54 g
  • 10.54 g
The pair of molecules that does not endorse law of multiple proportions is -
 
  • CO and CO2
  • H2O2 and H2O
  • SO2 and SO3
  • NO2- ion and NO2
0:0:1


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