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Published on: 24/05/2021
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Download CBSE Class 12th Standard CBSE Chemistry question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Chemistry
Questions + Answers key
Take MCQ Chemistry Test
1.
On addition of small amount of KMnO4 to concentrated H2SO4, a green oily compound is obtained which is highly explosive in nature, Identify the compound from the following.
Mn2O7
MnO2
MnSO4
Mn2O3
2.
Generally transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in solid state ?
Ag2SO4
CuF2
ZnF2
Cu2CI2
3.
Metallic radii of some transition elements are given below. Which of these elements will have hig
| Element | Fe | Co | Ni | Cu |
| Metallic | 126 | 125 | 125 | 128 |
Fe
Ni
Co
Cu
4.
The electronic configuration of Cu (II) is 3d9 whereas that of Cu (I) is 3d10 . Which of the following is correct ?
Cu (II) is more stable
Cu (II) is less stable
Cu (I) and Cu (II) are equally stable
Stability of Cu (I) and Cu (II) depends on nature of copper salts
5.
Electronic configuration of a transition element X in +3 oxidation state is [Ar] 3d5. What is its atomic number ?
25
26
27
24
1.
(a)
Mn2O7
2.
(b)
CuF2
3.
(d)
Cu
4.
(a)
Cu (II) is more stable
5.
(b)
26
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