Chemistry MCQ'S 2

(1)A change in which physical change does not change is called does not change is called ?
(a)Chemical change  
(b) physical change 
(c)Temporary change 
(d) All of them
ANSWER: (b)

(2)Smallest unit of an element which can exist independently is called ?
(a)Atom
(b)ion
(c)Electron
(d)Molecule
ANSWER: (a)

(3) Representation of a chemical change in terms of symbols is called ?
(a)Symbol
(b)Equation
(c)Formula
(d)All
ANSWER: (b)

(4) The formula which gives simplest ration between atoms is called a ____.
(a)Molecular formula 
(b)Empirical formula 
(c)Unit formula 
(d) N.O.T
ANSWER: (b)

(5)The reliable digits in a number that are known with certainty are called  ______.
(a)Important figures
(b)Significant figures 
(c)Numbers 
(d) All of them
ANSWER: (b)