1My ans are
1d
2a
3b
4b
5d&a reactivity decreases
These are my problems rather than a test
a few gud problems in inorganic
1)Which of the following has the highest electrode potential?
a. Be b. Mg c. Ca d. Ba
2)Neutrons are produced by
a. Ra b. Ba c. Sr d. Be
3)The most electropositive among the alkaline earth metals is
a. Be b.Ba c. Mg d. Ca
4)Addition of excess KCN to an aqueous solution of CuSO4 gives
a.Cu(CN)2
b.K2[Cu(CN)4]
c.K3[Cu(CN)4]
d.K[Cu(CN)2]
5)Alkali metals react with hydrogen forming ionic hydrates.
there reactivity in this reaction is
a. Li>Na>K>Rb>Cs
b. Li<Na<K<Rb<Cs
c. Li<Na>K>Rb>Cs
d. Li>Na>K<Rb>Cs
Plz do post ur ans here ill check dem.....n den discuss......
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23 Answers
1this is a very special case sidis...
u have noticed it very correctly..
the Cu2+ does change its oxidation state..!!
dats y we get that bhayanak complex [3] ..
orelse we wud have got that simple sa B wala complex.. [1]
21sid, if u start thinkin in INORGANIC..... the subj will abuse u coz usme sochne kuch hai hi nahi LOL [4]
3 mein i dont think it'll be D coz highest are Ba and Ra
1most probably the buk ans are wrong but jus check if theres any exception coz inorganic mein rules se jyada to exception hote hai
itna to pata chal gaya that the 3rd ans of dis buk is wrong the correct is b
1The ans my buk says are
1b
2d
3d
4c
5a
Now these ans may b wrong but the buk says this....
1@sky
what i thouht about the 4th wala was.........
the equations u have given seem to b correct...meanin dey r correct but think about this....
in CuSO4 Cu has an oxidation state of 2+ and in the compound i thought it shud b the same but it isnt......ur take on it
14th wala is C.
the reaction (if i remmber correctly)
Cu 2+ + KCN -> CuCN (white ppt)
| more KCN
V
K3[Cu(CN)4] -- this is soluble + very stable
395TH ONE ARE U SURE? I THINK THE STABILITY OF HYDRIDES INCREASES DOWN THE GROUP, SO ANSWER MUST BE b .
39hey 3rd wala, i know, its an exception, i read it yesterday..
value of electronegativity is same for barium and radium na. so both are equally electropositive?