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प्रश्न
Give two tests of the following:
Water vapour
उत्तर
Water vapour : These are colourless vapours and are neutral to litmus. These can be tested by first condensing on the walls (cooler parts) of the test tube and then by adding anhydrous copper sulphate to the collected liquid, if the white colour of copper sulphate changes to blue, then the gas is water vapour.
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संबंधित प्रश्न
Nitrogen and oxygen gas react as illustrated by the equation given below: N2 + O2 → 2NO
Calculate the volume of each reacting gas required to produce 1400cm3 of nitric oxide.
Each of the two flasks contains 2.0 g of gas at the same temperature and pressure. One flask contains oxygen and the other hydrogen. Which sample contains the greater number of molecules?
O2 is evolved by heating KCIO3 using MnO2 as a catalyst.
\[\ce{2KCI3 ->[MnO2] 2KCl + 3O2}\]
- Calculate the mass of KClO3 required to produce 6.72 litres of O2 at STP. [atomic masses of K = 39, Cl = 35.5, O = 16].
- Calculate the number of moles of oxygen present in the above volume and also the number of molecules.
- Calculate the volume occupied by 0.01 mole of CO2 at STP.
The reaction between the red lead and hydrochloric acid is given below:
\[\ce{Pb3O4 + 8HCl -> 3PbCl2 + 4H2O + Cl2}\]
Calculate the mass of the chlorine.
1.56 g of sodium peroxide reacts with water according to the following equation:
\[\ce{2Na2O2 + 2H2O -> 4NaOH + O2}\]
Calculate the mass of sodium hydroxide formed.
Aluminium carbide reacts with water according to the following equation.
\[\ce{Al4C3 + 12H2O -> 3CH4 + 4Al(OH)3}\]
What mass of aluminium hydroxide is formed from 12g of aluminium carbide?
What mass of copper hydroxide is precipitated by using 200 gm of sodium hydroxide?
\[\ce{2NaOH + CuSO4 -> Na2SO4 + Cu(OH)2↓}\]
[Cu = 64, Na = 23, S = 32, H = 1]
66g of ammonium sulphate is produced by the action of ammonia on sulphuric acid. Write a balanced equation and calculate the volume of the gas used at STP.
Aluminium carbide reacts with water according to the following equation.
\[\ce{Al4C3 + 12H2O -> 3CH4 + 4Al(OH)3}\]
What volume of methane is obtained from 12 g of aluminium carbide?
Concentrated nitric acid oxidises phosphorus to phosphoric acid according to the following equation:
\[\ce{P + 5HNO3_{(conc.)}-> H3PO4 + H2O + 5NO2}\]
If 9.3 g of phosphorus was used in the reaction, calculate:
- Number of moles of phosphorus taken.
- The mass of phosphoric acid formed.
- The volume of nitrogen dioxide produced at STP.
