Give reasons
a) Silver article becomes black after some time.
b) Zn can desplace copper from CuSO solution colour of solution in four 4
test tubes ore green, yellow, blue and colourless. Which has ZnSO4
solution?
In which case reaction will take place?
Zn/CuSO solution 4
Cu/ZnSO Solution 4
Fe/CaSO Solution 4
Ce/FeSO4 Solution
It which case reaction will take place?
Al/ZnSO Solution 4
Zn/Al2
(SO4
)3 Solution
Cu/ZnSO Solution 4
Fe/ZnSO Solution 4
Four labelled solution A,B,C,D along with Radish-Browni, Dark Grey, Blue, Silver, White. Which has Alluminium strip.
A Students puts four big iron nails in four different test tube with ZnSO , 4
Al2
(SO4
)3
, FeSO4
, coating on iron nail well appear?
Answers
a)....
Silver article when exposed to air become black after sometimes. This is because silver metal react with sulphur present in atmosphere to form silver sulphide. Thus , a layer of silver sulphide is formed on surface of silver articles, because of which they appear dull and black.
b)....
Colour of zinc sulphate solution is colourless.
Hence, Test tube 4 is ZnSo4 solution.
Reaction will take place in Zn /CuSo4 solution
Because zinc is more reactive than copper.Hence, zinc will take place of copper.
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Answer:
explain the trends:-
1.atomic size- down the group and across the period
2. metallic character-down the group and across the period
3. non metallic character- down the group and across the period