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Subject: Chemistry, asked on 19/6/18

22.4 litres of a gas weighs 70g at STP. Calculate the weight of the gas if  it occupies a volume of 20 litres at 27 degree celsius and 700 mm of hg pressure.(ans=52.38g) Dont uz PV=nRT as we dont have that concept currently in class 9.

Subject: Chemistry, asked on 30/1/18

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Subject: Chemistry, asked on 24/3/18

Name the gas evolved when potassium nitrate crystals are heated.

Subject: Chemistry, asked on 6/9/18

100 mL of nitrogen collected at 27 degree Celsius and 720 mm Hg is cooled to -73 degree Celsius under a pressure of 760 mm of Hg. What is the volume occupied by the gas ?

Subject: Chemistry, asked on 30/10/18

The pressure of a gas  is maintained in a steel tank is 20 atm.If the pressure has to be increased by 20%, to what temperature is the tank heated, if the initial temperature is 27ºC.

Subject: Chemistry, asked on 30/10/18

A flask having a volume of 250 mL and containing air is heated to 100ºC and sealed.The flask is cooled to 25ºC, immersed in water and opened.what volume of water will be drawn into the flask, assuming the pressure to be constant?

Subject: Chemistry, asked on 12/8/20

Kartic r u here....!!!!

Subject: Chemistry, asked on 9/6/18

Calculate the volume of dry air at STP that occupies 28 mL at 14 degree Celsius and 750 mm Hg saturated with water vapour . The vapour pressure of water at 14 degree Celsius is 12 mm Hg.

Subject: Chemistry, asked on 3/2/18

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Subject: Chemistry, asked on 31/1/18

Solve this:

8. 88 cm3 of nitrogen is at a pressure of 770 mm mercury. If the pressure is raised to 880 mm Hg, find by how much the volume will diminish, temperature remains constant.
[Ans. 11 cm3]

9. A gas at 240 K is heated to 1270C. Find the percentage change in the volume Of the gas (pressure remaining constant). [Ans. 66.6%] 

Subject: Chemistry, asked on 24/9/20

?Calculate the pressure of a gas, when its volume is 750 ml, initially the gas having a volume of 1250 ml?kand?pressure of 0.8 atm. Assume the temperature remain constant. [1.33 mm of Hg]

Subject: Chemistry, asked on 4/12/19

A vessel of capacity 600 cm3 contains hydrogen gas at a pressure 330 cm Hg .what will be the pressure of hydrogen gas when the vessel is connected to another vessel of 300 cm3 capacity

Subject: Chemistry, asked on 11/6/18

Q.3 A student performed an experiment to measure pressure and volume of a gas at constant temperature and noted the following : Pressure (mm of Hg) 100 125 200 y volume (cm3) 80 x 40 32 Calculate the value of x and y . WHich law was used in the calculation ? draw the suitable graph

Subject: Chemistry, asked on 24/9/20

5dm3 of dry oxygen gas is allowed to expand to 7dm3, when its pressure recorded is 700mm of Hg. Find?initial pressure of gas, assume temperature remain constant. ? ?[980mm of Hg].

Subject: Chemistry, asked on 17/1/19

Numerical no 1

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