IIT FOUNDATION
Name : ________________________________________ Marks : 25m
I. Carbon burns with Oxygen. 3 x 1 = 3
1) How much amount of Oxygen is required?
Ans -

2) How many atoms of Carbon is required to libereate 6.023 x 1023 molecules of Carbondioxide ?
Ans -

3) How much volume of Carbondioxide is liberated when 6 gm of Carbon reacts with Oxygen ?
Ans -

II. Calcium Carbonate reacts with dilute Hydrochloric acid. 3 x 1 = 3
4) How many moles of Carbondoxide is liberated when 100gm of Calcium Carbonate is treated with dilute Hydrochloric acid ?
Ans -

5) How many molecules of Calcium carbonate reacts with 2 moles of Hydrochloric acid?
Ans -

6) How much volume of Carbondoxide liberate when 10 gm of Calcium Carbonate reacts with Hydrochloric acid ?
Ans -

III. Hydrogen burns with Oxygen. 4 x 1 = 4
7) How many grams of Hydrogen is required?
Ans -
8) How many volumes of Hydrogen is required?
Ans -
9) How many moles of Oxygen is required?
Ans -
10) How much volume of Oxygen is required to react with 1.2 gms of Hydrogen?
Ans -
IV. Write P for the physical change and C for the chemical change in the blank space on the right for the following changes. 11 x 1 = 11

11) Formation of dew. [ ]
12) Evaporation of water. [ ]
13) Rusting of iron. [ ]
14) Sublimation of camphor. [ ]
15) Digestion of food [ ]
16) Making of ice cream. [ ]
17) Breaking of glass pane. [ ]
18) Smoking of cigarette [ ]
19) Decomposition of water into hydrogen and oxygen. [ ]
20) Melting of wax. [ ]
21) Burning of magnesium in air.

V. Differentiate between Physical and Chemical changes. 1 x 4 = 4

* * *