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Shruti Menon
Subject: Chemistry
, asked on 18/2/16
Sc
3+
and Te
4+
compounds are colourless . why?
Answer
2
Sagar
Subject: Chemistry
, asked on 11/2/16
Q= Mn
+2
is more resistant than Fe
+2
towards oxidation...
Answer
1
Sagar
Subject: Chemistry
, asked on 11/2/16
Q= THERE is general increase in density from titanium to copper??
Answer
1
Manan Sharma
Subject: Chemistry
, asked on 31/1/16
Write balanced chemical equations to support the following observations:
An aqueous solution of this salt is orange in colour. On increasing the pH the colour changes to yellow
A dark green salt disproportionate on acidification to give a dark purple salt
Answer
1
Agrim Moudgil
Subject: Chemistry
, asked on 26/1/16
Why first ionisation enthalpyof Cr is lower than of Zn?
Answer
1
Khushraj
Subject: Chemistry
, asked on 24/1/16
how to calculate theoretical value of FAS?
Answer
1
Supercoool Tiwari
Subject: Chemistry
, asked on 14/1/16
These are my second pre board questions :-
1.Transition elements show higher oxidation state in their oxides than in fluorides. Why ?
2.Ionisation enthalpies of lanthanides are higher than actinides.
3.There are two -NH
2
groups in semicarbazide. However, only one is involved in the formation of semicarbazone. Why ?
Please ans all questions soon.
Answer
1
Nimish Jain
Subject: Chemistry
, asked on 10/1/16
Amongst the following ions, which of the following is considered most stable in M2+ state ?
Ti
2
+
/Ti (-1.63V)
V
2
+
/V (-1.11V)
Cr
2
+
/Cr (-0.90V)
Mn
2
+
/Mn (+1.18V)
Answer
2
Nimish Jain
Subject: Chemistry
, asked on 10/1/16
which of the following is a non typicaltransition element
Ti
Cr
Fe
Sc
Answer
1
Sonal Gupta
Subject: Chemistry
, asked on 10/12/15
Acidic character increases from HF to HI. Why ?
PLEASE ANSWER THIS QUESTION FAST...
Answer
1
Adity Tiwari
Subject: Chemistry
, asked on 24/10/15
what are the point of differences between lanthanoids and actinoids in terms of their physical and chemical properties ?
Answer
1
Adity Tiwari
Subject: Chemistry
, asked on 24/10/15
what are the similarities between lanthanoids and actinoids in terms of physical and chemical properties ?
Answer
1
Adity Tiwari
Subject: Chemistry
, asked on 23/10/15
what are the similarities and differences between actinoids and lanthanoids ?
Answer
1
Ayushman Sahu
Subject: Chemistry
, asked on 21/10/15
write the oxidation state of Fe in brown ring formed while testing presence of nitrate ion?
what shall be the oxidation state of NO?
how to find such oxidation state of a compound?
plz answrevery bit .plz send its urgent
Answer
1
Ayushman Sahu
Subject: Chemistry
, asked on 21/10/15
actinoidsdisplay a variety of oxidation states.give reasons?
Answer
1
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2
3
4
5
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What are you looking for?
1.Transition elements show higher oxidation state in their oxides than in fluorides. Why ?
2.Ionisation enthalpies of lanthanides are higher than actinides.
3.There are two -NH2 groups in semicarbazide. However, only one is involved in the formation of semicarbazone. Why ?
Please ans all questions soon.
PLEASE ANSWER THIS QUESTION FAST...
- write the oxidation state of Fe in brown ring formed while testing presence of nitrate ion?
- what shall be the oxidation state of NO?
- how to find such oxidation state of a compound?
plz answrevery bit .plz send its urgent