Download App

The d & f Block Elements — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements5 Marks
Question
Match the solutions given in Column I and the colours given in Column II.
 
Column I
(Aqueous solution of salt)
 
Column II
(Colour)
(i)
FeSO4.7H2O
(a)
Green
(ii)
NiCl2.4H2O
(b)
Light pink
(iii)
MnCl2.4H2O
(c)
Blue
(iv)
CoCl2.6H2O
(d)
Pale green
(v)
Cu2Cl2
(e)
Pink
 
 
(f)
Colourless
✓

Answer

 
Column I
(Aqueous solution of salt)
 
Column II
(Colour)
(i)
FeSO4.7H2O
 (d) Pale green
(ii)
NiCl2.4H2O
(a)
 Green
(iii)
MnCl2.4H2O
(b)
 Light pink
(iv)
CoCl2.6H2O
(e)
 Pink
(v)
Cu2Cl2
(f)
 Colourless

Explanation:

  1. FeSO47H2O – Pale green
  2. NiCl24H2O - Green
  3. MnCl24H2O - Light Pink
  4. CoCl26H2O - Pink
  5. Cu2Cl2 – Colourless

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Long Answer Type Questions [5M]" from The d & f Block Elements→The d & f Block Elements — all question types→Chemistry STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

Match the terms given in Column I with the units given in Column II.

 
 Column I

 

 Column II
i.

 $\text{K}$

 a.

 $\text{I}\times\text{t}$
ii.

 $\wedge_{\text{m}}$

 b.

 $\frac{\wedge_{\text{m}}}{\wedge^\circ_\text{m}}$
iii.

 $\alpha$

 c.

 $\frac{\text{k}}{\text{c}}$
iv.

 $\text{Q}$

 d.

 $\frac{\text{G}^*}{\text{R}}$
→
Write major product(s) in the following reaction .
Image
→
Match the catalysts given in Column I with the processes given in Column II.
 
Column I (Catalyst)
 
Column II (Process)
(i)
Ni in the presence of hydrogen
(a)
Zieglar Natta catalyst
(ii)
Cu2Cl2
(b)
Contact process
(iii)
V2O5
(c)
Vegetable oil to ghee
(iv)
Finely divided iron
(d)
Sandmeyer reaction
(v)
TiCl4 + Al (CH3)3
(e)
Haber’s Process
 
 
(f)
Decomposition of KClO3
→
Write a detailed note on enzymes.
→
Describe the methods of studying various first order reactions with examples.
→
Give different examples of nucleophilic addition reactions of carbonyl compounds.
→
Compare the chemistry of actinoids with that of the lanthanoids with special reference to : 
(i) electronic configuration
(ii) atomic and ionic sizes
(iii) oxidation state and
(iv) chemical reactivity.
→
Discus in detail the following $C - H$ bond cleavage reactions of ether :
(i) Peroxide formation
(ii) Halogenation
→
The experimental data for decomposition of N2O5
[2N2O5 → 4NO2 + O2]
in gas phase at 318K are given below:
t/s 0 400 800 1200 1600 2000 2400 2800 3200
102 × [N2O5]/mol L-1 1.63 1.36 1.14 0.93 0.78 0.64 0.53 0.43 0.35
  1. Plot [N2O5] against t.
  2. Find the half-life period for the reaction.
  3. Draw a graph between log[N2O5] and t.
  4. What is the rate law?
  5. Calculate the rate constant.
  6. Calculate the half-life period from k and compare it with (ii).
→
I. Show how p-aminoazobenzene can be obtained from aniline.
II. Write structures for the following compounds:
   a. Benzene diazonium chloride
   b. p-Nitrotoluene
   c. Sulphanilic acid
→