The number of moles of Mohr's salt required per mole of dichromate ion is:
(1) 3
(2) 4
(3) 5
(4) 6
Which of the following pairs of substances on reaction will not evolve gas?
1. Iron, and (aq)
2. Iron, and steam
3. Copper, and HCl(g)
4. Sodium, and ethyl alcohol
When acts as an oxidising agent and ultimately forms , then the number of electrons transferred in each case respectively is:
1. 4,3,1,5
2. 1,5,3,7
3. 1,3,4,5
4. 3,5,7,1
Which one of the compounds does not decolorized an acidified solution of ?
1.
2.
3.
4.
Which of the following has the highest negative standard electrode potential ?
1. Ti
2. Cu
3. Mn
4. Zn
The magnetic moment of an Mn2+ ion is equal to:
1. | 5.92 BM | 2. | 2.80 BM |
3. | 8.95 BM | 4. | 3.90 BM |
Incorrect statement among the following is :
1. La(OH)3 is less basic than Lu(OH)3
2. In lanthanoid series ionic radius of Ln3+ ions decreases.
3. La is actually an element of transition metal series rather than lanthanide series.
4. Atomic radii of Zr and Hf are same because of lanthanide contraction.
When the sample of copper with zinc impurity is to be purified by electrolysis,
the appropriate electrodes are
Cathode Anode
(1) pure zine pure copper
(2) pure copper impure sample
(3) impure zinc impure sample
(4) impure sample pure copper
What is produced when excessive diluted nitric acid is combined with potassium chromate?
1. Cr2O72- and H2O
2. Cr3+ and Cr2O72-
3. CrO42-
4. Cr2O42-
Cerium (Z-58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?
(1) The common oxidation states of cerium are +3 and +4
(2) The +3 oxidation state of cerium is more stable than the +4 oxidation state
(3) The +4 oxidation state of cerium is not known in solutions
(4) Cerium (IV) acts an oxidizing agent