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800 cm3 of gas is collected at 654 mm pressure. At what pressure would the volume of the gas reduce by 40% of its original volume, the temperature remaining constant?
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A cylinder of 20 liters capacity contains gas at 100 atmospheric pressure. How many flasks of 200 cm3capacity can be filled from it at 1-atmosphere pressure, temperature remaining constant?
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A sample of carbon dioxide occupies 30 cm3 at 15°C and 740 mm pressure. Find its volume at STP.
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A given amount of gas A is confined in a chamber of constant volume. When the chamber is immersed in a bath of melting ice, the pressure of the gas is 100 cmHg.
- What is the temperature when the pressure is 10cmHg?
- What will be the pressure when the chamber is brought to 100°C
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A gas is to be filled from a tank of capacity 10,000 litres into cylinders each having capacity of 10 litres. The condition of the gas in the tank is as follows:
- The pressure inside the tank is 800 mm of Hg.
- The temperature inside the tank is −3°C.
When the cylinder is filled, the pressure gauge reads 400 mm of Hg and the temperature is 270 K. Find the number of cylinders required to fill the gas.
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Which will have greater volume when the following gases are compared at STP:
- 1.2/N2 at 25°C and 748 mmHg
- 1.25/O2 at STP
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Why is it necessary to compare gases at S.T.P?
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Write the value of:
the standard temperature in:
(i) °C
(ii) K
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Write the values of:
standard pressure in:
(i) atm
(ii) mm Hg
(iii) cm Hg
(iv) torr
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Correct the following statement:
The standard temperature is 25°C.
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What temperature would be necessary to double the volume of a gas initially at s.t.p. if the pressure is decreased by 50%?
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What are green house gases? How are they responsible for global warming?
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How can we reduce global warming?
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Explain the term 'global warming'. State two ways by which global warming can be reduced.
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What do you observe when dilute sulphuric acid is added to the following:
Sodium carbonate
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How will you distinguish sodium chloride, potassium chloride, and calcium chloride?
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Explain how global warming takes place in the presence of green house gases. Give a reason why the surface temperature of earth is maintained in absence of green house gases.
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‘Oxides of nitrogen namely nitrous oxide, are released into the atmosphere from varied sources’. Explain the statement with relevant sources.
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Give balanced equation for the following conversion [one or two steps].
Nitrogen to nitrogen dioxide – in an internal combustion engine.
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