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प्रश्न
State your observation of the following case:
When moist starch iodide paper is introduced into chlorine gas.
उत्तर
When moist starch iodide paper is introduced into chlorine gas, chlorine oxidises iodide to iodine, which shows up as blue when it forms a complex with starch.
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संबंधित प्रश्न
If 6 liters of hydrogen and 4 liters of chlorine are mixed and exploded and if water is added to the gases formed, find the volume of the residual gas.
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A gas of 32 g mass has a volume of 20 litres at STP. Calculate the gram molecular weight of the gas.
The mass of 11.2 litres of a certain gas at s.t.p is 24 g. Find gram molecular mass of the gas
The equation given below relates the manufacture of sodium carbonate (molecular weight of Na2CO3 = 106).
- NaCl+NH3+ CO2+ H2O→ NaHCO3+NH4Cl
- 2NaHCO3→ Na2CO3+H2O + CO2
Equations (1) and (2) are based on the production of 21.2 g of sodium carbonate.
(a) What mass of sodium hydrogen carbonate must be heated to give 21.2 g of sodium carbonate?
(b) To produce the mass of sodium hydrogen carbonate calculate in (a), what volume of carbon dioxide, measured at S.T.P. would be required?
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Write the values of:
standard pressure in:
(i) atm
(ii) mm Hg
(iii) cm Hg
(iv) torr
Correct the following statement:
The standard temperature is 25°C.
Water decomposes to O2 and H2 under suitable conditions as represented by the equation below:
\[\ce{2H2O -> 2H2 + O2}\]
The 2500 cm3 of H2 is subjected to `2 1/2` times increase in pressure (temp. remaining constant). What volume will H2 now occupy?
60 cm3 of oxygen was added to 24 cm3 of carbon monoxide and mixture ignited. Calculate the volume of carbon dioxide formed.
