Important Question of Chemistry 11 Ch 1

VIGYAN
Table of Contents Contents One Mark questions with answers 1. What is the significant figures in 1.050 x 10 4 ?  Ans. Four  2. What is the S.I. unit of Density?  Ans. Kg m -3 3. What do mean by Mole fraction?  Ans. Mole Fraction is the ratio of number of moles of one component to the total  number of moles (solute and solvents) present in the solution. It is  expressed as 'x'.  4. Round off up to 3 significant figure (a) 1.235 (b) 1.225 Ans. (a) 1.24 (b) 1.22  5. What is AZT?  Ans. Azidothymidine.  6. What is limiting reagent?  Ans.The reactant which gets consumed first or limits the amount of product  formed is known as limiting reagent  7. Define one mole?  Ans. One mole is the amount of a substance that contains as many particles as  there are atoms in exactly 12 g of the carbon-12.  8. Calculate the formula mass calcium chloride.  Ans. Formula mass of CaCl 2 = 40+2 x35.5=40+71 = u  9.What is the law called which deals with the ratios of the volumes of the  gaseous reactants and products?