|
Why are potassium and caesium rather than lithium used in photoelectric cells?
|
|
0
|
2823
|
August 13, 2016
|
|
Why caesium can be used in photo-electric cells while lithium cannot be?
|
|
0
|
2108
|
August 13, 2016
|
|
Why is sodium kept in kerosene oil?
|
|
0
|
876
|
August 13, 2016
|
|
Name three metal ions which play important role in performing several biological functions in the animal body
|
|
0
|
437
|
August 13, 2016
|
|
Predict giving reason the outcome of the reaction
|
|
1
|
521
|
August 13, 2016
|
|
Amongst alkali metals why is lithium regarded as most powerful reducing agent in aqeuous solution?
|
|
0
|
550
|
August 13, 2016
|
|
Why is the solution of an alkali metal in ammonia blue?
|
|
0
|
466
|
August 13, 2016
|
|
Out of LiOH, NaOH, KOH which is the strongest base?
|
|
0
|
2445
|
August 13, 2016
|
|
Why does lithium show anomalous behaviour?
|
|
0
|
1062
|
August 13, 2016
|
|
What is the reason that sodium reacts with water more vigrously than lithium?
|
|
0
|
460
|
August 13, 2016
|
|
Arrange the following in order of increasing covalent character MCI, MBr, MF, MI
|
|
0
|
2556
|
August 13, 2016
|
|
Amongst Li, Na, K, Rb, Cs, Fr which one has highest and which one has the lowest ionisation enthalpy?
|
|
0
|
892
|
August 13, 2016
|
|
Why group I elements have lowest ionisation enthalpy?
|
|
0
|
452
|
August 13, 2016
|
|
Why is oxidation state of Na and K always + 1?
|
|
0
|
948
|
August 13, 2016
|
|
Name the elements (alkali metals) which form superoxide when heated in excess of air
|
|
0
|
1766
|
August 13, 2016
|
|
What happens when sodium dissolve in liquid ammonia?
|
|
0
|
1998
|
August 13, 2016
|
|
Which one of the following alkali metals gives hydrated salts?
|
|
1
|
3016
|
August 13, 2016
|
|
Which of the alkali metal is having least melting point?
|
|
1
|
2281
|
August 13, 2016
|
|
Explain why is sodium less reactive than potassium?
|
|
0
|
4603
|
August 13, 2016
|
|
Find out the oxidation state of sodium in ${{Na}_{2}}$${{O}_{2}}$
|
|
0
|
1566
|
August 13, 2016
|
|
Why are alkali metals not found in nature?
|
|
0
|
1481
|
August 13, 2016
|
|
How can you show that ${{H}_{2}}$${{O}_{2}}$ works both as oxidising and reducing agent by giving examples
|
|
0
|
695
|
August 13, 2016
|
|
Complete the following and classify the reactions into:
|
|
1
|
764
|
August 13, 2016
|
|
Compare structures of ${{H}_{2}}$0 and ${{H}_{2}}$${{O}_{2}}$?
|
|
0
|
594
|
August 13, 2016
|
|
Calculate the volume of 10 volumes of ${{H}_{2}}$${{O}_{2}}$solution that will react with 200 ml of 2N KMn${{O}_{4}}$in acidic medium?
|
|
0
|
619
|
August 13, 2016
|
|
Complete the following:
|
|
1
|
609
|
August 13, 2016
|
|
Find the volume strength of 1.6 N ${{H}_{2}}$${{O}_{2}}$ solution?
|
|
0
|
2081
|
August 13, 2016
|
|
Compare the structure of ${{H}_{2}}$O and ${{H}_{2}}$${{O}_{2}}$
|
|
0
|
624
|
August 13, 2016
|
|
Write reactions showing:
|
|
1
|
586
|
August 13, 2016
|
|
Explain the mechanism of bleaching action of ${{H}_{2}}$${{O}_{2}}$
|
|
1
|
782
|
August 13, 2016
|