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Chemical formula

Example: Balanced Chemical Equations with Subscripts Water: $$\ce{H2O}$$ Carbon dioxide: $$\ce{CO2}$$ Iron(III) hydroxide (Rust reaction): $$\ce{4Fe + 3O2 + 6H2O -> 4Fe(OH)3}$$ Copper(II) sulfate pentahydrate: $$\ce{CuSO4 * 5H2O}$$ Chemical Formulas in Chemistry Chemical formulas are the symbolic representations of chemical substances. They show the elements present in a compound and the ratio in which the atoms of these elements combine. Chemical formulas are essential for understanding the composition, structure, and behavior of compounds in chemical reactions. 1. What is a Chemical Formula? A chemical formula uses symbols of elements and numerical subscripts to represent the composition of a substance. For example, the formula for water is: $$ \ce{H2O} $$ This indicates that each water molecule is made up of 2 atoms of hydrogen and 1 atom of oxygen. 2. Types of Chemical Formulas Empirical Formula Molecular Formula Structural Formula...
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IIT Practice Paper

                                


1. The area enclosed between the parabola y^2 = 4x and x^2 = 4y is 

 (a) 3/16 sq. unit
 (b) 16/3 sq. units 
 (c) 14/3 sq. units
 (d) 3/4 sq. units 

Answer: (b) 

2. When a copper ball is heated , the largest percentage increase will occur in its

 (a) diameter 
 (b) area 
 (c) volume 
 (d) density 

Answer : (c) 

3. Which of the following units is useful in relating concentration of solution with its vapour pressure ? 

 (a) mole fraction 
 (b) parts per million 
 (c) mass percentage 
 (d) molality 

Answer : (a) 

4. The curve y = x^(1/5) has at (0,0) : 
 
 (a) a vertical tangent 
 (b) a horizontal tangent 
 (c) an oblique tangent 
 (d) no tangent 

Answer: (a) 

5. While a particle executes linear simple harmonic motion 

(a) It's linear velocity and acceleration pass through their maximum and minimum values once in each oscillation 
(b) It's linear velocity and acceleration pass through their maximum and minimum values twice in each oscillation 
(c) It's linear velocity and acceleration pass through their maximum and minimum values four times in each oscillation 
(d) It's linear and acceleration always attain their peak values simultaneously 

Answer: (b) 

6. The speed of a wave in a certain medium is 960 m/s . If 3600 waves pass over a certain point of the medium in 1 min , the wavelength is 

(a) 2m 
(b) 4m 
(c) 8m 
(d) 16m 

Answer : (d) 

7.   2 : 4 Dinitrophenyl hydrazine is an example for 

 (a) Tridentate ligand 
 (b) Monodentate ligand 
 (c) Polydentate ligand 
 (d) Didentate ligand 

Answer : (b) 

8. A ray of light strikes a horizontal plane mirror at an angle of 45°. A second plane mirror is attached at an angle theta with it . If ray after reflection from second mirror runs parallel to the first mirror , then theta is : 

(a) 45° 
(b) 60° 
(c) 67° 30 
(d) 135° 

Answer : (c) 
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