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प्रश्न
Write the observation for the following:
Moist starch iodide paper is put on the mouth of a test tube containing chlorine gas.
उत्तर
Chlorine gas turns moist starch iodide paper black.
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संबंधित प्रश्न
Under the same conditions of temperature and pressure you collect 2L of carbon dioxide, 3L of chlorine, 5L of hydrogen, 4L of nitrogen and 1L of sulphur dioxide. In which gas sample will there be :
a. The greatest number of molecules.
b. The least number of molecules.
Justify your answer.
Samples of the gases O2, N2, CO2 and CO under the same conditions of temperature and pressure contain the same number of molecules represented by X. The molecules of Oxygen, occupy V litres and have a mass of 8 g. Under the same conditions of temperature and pressure :
What is the volume occupied by : 3X molecules of CO? [C=12,N=14,O=16]
Give two tests of the following:
Water vapour
200 cm3 of hydrogen and 150 cm3 of oxygen are mixed and ignited, as per the following reaction,
\[\ce{2H2 + O2 → 2H2O}\]
What volume of oxygen remains unreacted?
66g of ammonium sulphate is produced by the action of ammonia on sulphuric acid. Write a balanced equation and calculate mass of ammonia required.
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.
Nitrogen and hydrogen react to form ammonia.
\[\ce{N2_{(g)} + 3H2_{(g)}-> 2NH3_{(g)}}\]
If 1000g H2 reacts with 2000g of N2
Will any of the two reactants remain unreacted? If yes, which one and what will be its mass?
Washing soda has formula Na2CO3.10H2O. What mass of anhydrous sodium carbonate is left when all the water of crystallization is expelled by heating 57.2 g of washing soda?
Given that the relative molecular mass of copper oxide is 80, what volume of ammonia (measured at STP) is required to completely reduce 120g of copper oxide? The equation for the reaction is:
\[\ce{3CuO + 2NH3 → 3Cu + 3H2O + N2}\]
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?
