Chapter 1 => Some Basic Concepts of Chemistry Short Questions Answers (1 Marks)

Practice Short (1Marks) Answers on chapter 1"Some Basic Concepts of Chemistry" for board exams like CBSE and entrance examination like CBSE NEET.











Q.1. What is the significant figures in 1.050 x 10⁴?

 Ans.1. Four

Q.2.  What is the S.I. unit of Density?

Ans.2. Kg m^-3

Q.3. What do mean by Mole fraction?

Ans.3. 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'.

Q.4. Round off up to 3 significant figure (a) 1.235 (b) 1.225
 Ans.4. (a) 1.24 (b) 1.22.

Q.5.What is AZT?

Ans.5. Azidothymidine.

Q.6.What is limiting reagent?

Ans.6.The reactant which gets consumed first or limits the amount of product formed is known as limiting reagent.

Q.7.What is the relation between temperature in degree Celsius and degree fahrenheit?

Ans.7.          ^oF = 9/5 (^oC) + 32

Q.8. Define one mole?

Ans.8. 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.

Q.9. Calculate the formula mass calcium chloride.

Ans.9. Formula mass of CaCl₂= 40 + (2 x 35.5) = 40 + 71 = 111 u.

Q.10. What is the law called which deals with the ratios of the volumes of the gaseous reactants and products?

Ans.10. Gay Lussac‘s law of gaseous volumes.