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Class 9 Science Notes

Class 9 Science Notes

Click on the button below to download Class 9 Science Notes in PDF format.

MATTER IN OUR SURROUNDINGS

IS MATTER AROUND US PURE ?

ATOMS AND MOLECULES

STRUCTURE OF THE ATOM

THE FUNDAMENTAL UNIT OF LIFE

DIVERSITY IN LIVING ORGANISMS

FORCE AND LAWS OF MOTION

WORK AND ENERGY

WHY DO WE FALL ILL ?

NATURAL RESOURCES

IMPROVEMENT IN FOOD RESOURCES

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Recent Posts

Magnetic Properties of Solids

June 27, 2022June 27, 2022 dev

Magnetic Properties of Solids : The magnetic properties of materials are due to magnetic moment associated with individual electron. Each electron in atom has magnetic moment which originates from two sources:

Calculation of the degree of Association

July 5, 2022July 5, 2022 dev

Calculation of the degree of Association : The fraction of the total number of solute molecules which exist in the form of associated molecule is called degree of association.

Class 12 Chemistry Question and Answer

Air contain O2 and N2 in the ratio of 1 : 4. Calculate the ratio of solubilities in term of mole fraction of O2 and N2 dissolved in water at atmospheric pressure and room temperature at which Henry’s constant for O2 and N2 are 3.30 × 10^7 torr and 6.60 × 10^7 torr respectively.

July 28, 2022July 28, 2022 dev

Air contain O2 and N2 in the ratio of 1 : 4. Calculate the ratio of solubilities in term of mole fraction of O2 and N2 dissolved in water at atmospheric pressure and room temperature at which Henry’s constant for O2 and N2 are 3.30 × 10^7 torr and 6.60 × 10^7 torr respectively.

Class 12 Chemistry Question and Answer

At what partial pressure, oxygen will have solubility of 0.05 g L-1 in water at 293 K? Henry’s constant (KH) for O2 in water at 293 K is 34.36 k bar. Assume the density of the solution to be same as that of the solvent.

July 28, 2022July 28, 2022 dev

Class 12 Chemistry Question and Answer

If N2 gas is bubbled through water at 293 K, how many milli moles of N2 gas would dissolve in 1 litre of water. Assume that N2 exerts a partial pressure of 0.987 bar. The KH for N2 at 293 K is 76.48 k bar.

July 10, 2022July 28, 2022 dev

Class 12 Chemistry Question and Answer

One litre solution of N/2 HCl is heated in a beaker. It was observed that when the volume of the solution is reduced to 600 mL, 3.25 g of HCl is lost. Calculate the normality of the new solution.

July 10, 2022July 10, 2022 dev

Class 12 Chemistry Quizzes

Quiz 9 for Class 12 Chemistry Chapter 2 Solutions

July 8, 2022July 8, 2022 dev

Quiz 9 for Class 12 Chemistry Chapter 2 Solutions : This quiz consists of 15 questions of 1 mark each. There is no negative marking. You have to complete the quiz in 15 minutes. Your score will be displayed after you submit the quiz.

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