MEDIUM
9th CBSE
IMPORTANT
Earn 100

Hydrogen and oxygen combine in the ratio of 1 : 8 by mass to form water. What mass of oxygen gas would be required to react completely with 3 g of hydrogen gas? 

Important Questions on Test Paper 4

MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 9 - Test Paper 4>Test Paper 4>Q 3
Classify the following into elements, compounds and mixtures: 
water, sea water, dry ice, petrol, sugar, silver, brass, steel. 
 
HARD
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 9 - Test Paper 4>Test Paper 4>Q 4
Carbon combines with oxygen to form two oxides. The carbon content in one of the oxides is 42.9% while in the other oxide it is 27.3%. Show that these data are in agreement with the law of multiple proportions. 
HARD
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 9 - Test Paper 4>Test Paper 4>Q 5
Which observation led to the discovery of neutron? 
HARD
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 9 - Test Paper 4>Test Paper 4>Q 6
Why does temperature remain constant during melting and boiling? 
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 9 - Test Paper 4>Test Paper 4>Q 7
Why does evaporation cause cooling? 
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 9 - Test Paper 4>Test Paper 4>Q 8
Write three main characteristics of a true solution. 
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 9 - Test Paper 4>Test Paper 4>Q 9
Define saturated solution, unsaturated solution and supersaturated solution. 
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 9 - Test Paper 4>Test Paper 4>Q 10
Give two examples in which a physical change and a chemical change occur simultaneously.