Q.
If the concentration of glucose (C6H12O6) in blood is 0.9gL−1, what will be the molarity of glucose in blood ?
(a) 5 M (b) 50 M (c) 0.005 M (d) 0.5 M
Q.
Which of the following reactions is not correct according to the law of conservation of mass ?
(a) 2Mg(s)+O2(g)→2MgO(s)
(b) C3H8(g)+O2(g)→CO2(g)+H2O(g)
(c) P4(s)+5O2(g)→P4O10(s)
(d) CH4(g)+2O2(g)→CO2(g)+2H2O(g)
Q.
How many significant figures should be present in the answer of the following calculations ?
2.5×1.25×3.52.01
Q.
If the density of a solution is 3.12g mL−1, the mass of 1.5 mL solution in significant figures is .......
(a) 4.7 g (b) 4680×10−3g (c) 4.680 g (d) 46.80 g
Q.
Match the following physical quantities with units.
Physical quantityUnitA.Molarity1.g mL−1B.Mole fraction2.molC.Mole3.PascalD.Molality4.UnitlessE.Pressure5.mol L−1F.Luminuos intensity6.CandelaG.Density7.mol kg−1H.Mass8.Nm−19.kg
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