Please select a subject first
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Write the reaction of steam with a red hot iron.
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Write a balanced equation for the following:
Zinc reacts with caustic soda solution
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Write a balanced equation for the following:
Lead reacts with potassium hydroxide
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Write a balanced equation for the following:
Aluminium reacts with fused sodium hydroxide.
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Steam can react with metal and non-metal to liberate hydrogen. Give the necessary conditions and equations for the same.
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What do you understand by gas?
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During the practical session in the lab when hydrogen sulphide gas having offensive odour is prepared for some test, we can smell the gas even 50 metres away. Explain the phenomenon.
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What is diffusion? Give an example to illustrate it.
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Give reasons for the following:
Gas fills the vessel completely in which it is kept.
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Choose the correct answer:
The graph of PV vs P for gas is
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Match the following:
|
|
Column A |
Column B |
|
(a) |
cm3 |
(i) Pressure |
|
(b) |
Kelvin |
(ii) Temperature |
|
(c) |
Torr |
(iii) Volume |
|
(d) |
Boyle's law |
(iv) `"V"/"T" = ("V"_1)/("T"_1)` |
|
(a) |
Charles's law |
(v) `"PV"/"T" = ("P"_1 "V"_1)/"T"_1` |
|
|
|
(vi) PV = P1V1 |
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Fill in the blanks:
If the temperature is reduced to half, ………….. would also reduce to half.
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A gas occupies 500 cm3 at a normal temperature. At what temperature will the volume of the gas be reduced by 20% of its original volume, the pressure is constant?
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Correct the following statement:
0°C is equal to zero Kelvin.
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What do you understand by Temporary hardness?
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What do you understand by permanent hardness?
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What do you understand by soft water?
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Compare the effect of soaps and detergents on hard water.
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Name or state the following:
An equation used in chemical calculations which gives a simultaneous effect of changes of temperature and pressure on the volume of a given mass of dry gas
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Name or state the following:
The standard pressure of a gas in cm. of mercury corresponding to one atmospheric pressure.
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