When gaseous ammonia is passed over solid copper(II)oxide at high temperatures, nitrogen gas is formed. Also This N2 gas is not pure as it would be in the heating of NaN3 like compounds.
Q. Can ammonia be collected over water?
Ammonia gas is lighter than air and hence collected by the downward displacement of air. Ammonia is not collected over water because it is highly soluble in water.
Table of Contents
- Q. Can ammonia be collected over water?
- Q. Why is ammonia not collected by downward delivery?
- Q. When ammonia is passed over heated so it is oxidised to?
- Q. What happens when ammonia is passed through cuso4 solution?
- Q. What happens when hydrogen gas is passed over the heated copper oxide?
- Q. What happens when hydrogen gas is passed through soap solution?
- Q. Can copper oxide be reduced by hydrogen?
- Q. What happens when hydrogen gas is added?
- Q. Is hydrogen reactive or stable?
- Q. What happens when H2 is passed over lithium at 1073 Kelvin?
- Q. What happens when copper is heated in china dish?
- Q. What happens when copper powder is strongly heated in the presence of oxygen?
- Q. When copper is heated it gets coated with?
- Q. Why blue Colour of copper sulphate solution gets discharged when zinc rod is dipped in it?
- Q. What will be the change in the Colour of copper sulphate solution when magnesium is added to it write a balanced chemical equation for the same?
- Q. Why is FeSO4 Coloured?
Q. Why is ammonia not collected by downward delivery?
Ammonia is more dense than air so it is collected by downward delivery.
Q. When ammonia is passed over heated so it is oxidised to?
. The products will be copper, nitrogen and water vapour when ammonia is passed over heated copper(II) oxide. 3CuO + 2NH3 = 3Cu + N2 + 3H2O. Ammonia reduces cupric oxide to the free metal and gets itself oxidised to nitrogen….
Q. What happens when ammonia is passed through cuso4 solution?
Ammonia reacts with copper(II)ions to precipitate light blue copper hydroxide. Ammonia causes the copper ion to go back into the solution as a deep blue ammonia complex. The precipitate dissolves as we add an excess of ammonia.
Q. What happens when hydrogen gas is passed over the heated copper oxide?
When hydrogen gas is passed over heated copper (II) oxide, copper and steam are formed. Reduction is the process of losing oxygen or gaining hydrogen, while oxidation is the process of gaining oxygen or losing hydrogen.
Q. What happens when hydrogen gas is passed through soap solution?
On passing hydrogen gas through soap solution it does not get dissolved in it and the solution easily forms bubbles containing hydrogen gas. The presence of hydrogen gas can be tested with the help of a burning splinter near the bubbles. Then the popping sound will come.
Q. Can copper oxide be reduced by hydrogen?
Copper(II) oxide can be reduced by hydrogen and its formula determined. Natural gas (mainly methane) can also be used as a reducing agent, but the reaction is much slower.
Q. What happens when hydrogen gas is added?
The addition of hydrogen gas changes its black color to brown as the oxide gets reduced to copper metal and the hydrogen gets oxidized to form water. The end products formed are copper and water. On the other hand oxidation is referred to as gain of oxygen so hydrogen gas gains oxygen i.e. oxidizes and forms water.
Q. Is hydrogen reactive or stable?
Atomic hydrogen is very reactive. It combines with most elements to form hydrides (e.g., sodium hydride, NaH), and it reduces metallic oxides, a reaction that produces the metal in its elemental state.
Q. What happens when H2 is passed over lithium at 1073 Kelvin?
at 1073 K, ionic lithium hydride is formed when hydrogen gas is passed over lithium. The following reaction took place: The ionic lithium hydride thus formed have high melting point.
Q. What happens when copper is heated in china dish?
When the copper powder is heated in a china dish the copper powder surface becomes coated with black colour substance due to the formation of copper oxide by surface oxidation. The black colour is due to the formation of this copper (II) oxide as the copper comes in contact with the air.
Q. What happens when copper powder is strongly heated in the presence of oxygen?
When copper metal is heated in presence of oxygen, it gets oxidised to form black colour copper oxide.
Q. When copper is heated it gets coated with?
When Copper (Cu) is heated , the oxygen from the air combines with copper to form copper(II) oxide. The colour of copper changes to black . Therefore, the coating formed on the surface of copper is a copper oxide or cupric oxide (CuO).
Q. Why blue Colour of copper sulphate solution gets discharged when zinc rod is dipped in it?
The blue colour of copper sulphate solution is discharged when a rod of zinc is deppid in it. Zinc lies below copper in the electrochemeical series and can therefoe, release electrons to the Cu2+ ions . As a result Zn is oxidised whileCu(2+) ions are reduced.
Q. What will be the change in the Colour of copper sulphate solution when magnesium is added to it write a balanced chemical equation for the same?
Answer. Answer: Aqueous copper sulfate solution is blue from the colour of the hydrated Cu++ cations and since the sulfate anion is colourless. The colour of the copper sulfate does not change during the reaction with magnesium metal.
Q. Why is FeSO4 Coloured?
Ferrous sulphate crystals contain water molecules (FeSO4. 7H2O). On heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate (FeSO4) is formed. So their colour changes from light green to white.
