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Q. No.Which of the following processes does not involve the oxidation of iron?
1.
Rusting of iron sheets
2.
Decolourisation of blue CuSO4 solution by iron
3.
Formation of Fe(CO)5 from Fe
4.
Liberation of H2 from steam by iron at high temperature
Subtopic: d-Block Elements- Properties & Uses |
69%
From NCERT
NEET - 2015
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The pair of compounds that can exist together is:
1. FeCl3, SnCl2
2. HgCl, SnCl2
3. FeCl2, SnCl2
4. FeCl3, Kl
Subtopic: d-Block Elements- Properties & Uses |
52%
From NCERT
AIPMT - 2014
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In acidic medium, H2O2 changes Cr2O7–2 to CrO5 which has two (–O – O–) bonds.
The oxidation state of Cr in CrO5 is:
1. +5
2. +3
3. +6
4. -10
Subtopic: Chemistry of Mn and Cr Compounds |
74%
From NCERT
AIPMT - 2014
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The reason for the lanthanoid contraction is:
1. negligible screening effect of 'f' orbitals.
2. increasing nuclear charge.
3. decreasing nuclear charge.
4. decreasing screening effect.
Subtopic: Lanthanoid & Actinoids Contraction |
76%
From NCERT
AIPMT - 2014
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Identify the correct order of solubility in aqueous medium:
1. ZnS > Na2S > CuS
2. Na2S > CuS > ZnS
3. Na2S > ZnS > Cus
4. Cus > ZnS > Na2S
2. Na2S > CuS > ZnS
3. Na2S > ZnS > Cus
4. Cus > ZnS > Na2S
Subtopic: d-Block Elements- Properties & Uses |
AIPMT - 2013
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Diamagnetic lanthanoid ion among the following is:
(At nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)
(At nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)
1. Sm2+
2. Eu2+
3. Yb2+
4. Ce2+
2. Eu2+
3. Yb2+
4. Ce2+
Subtopic: f-Block Elements- Properties & Uses |
61%
From NCERT
AIPMT - 2013
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Considering the following reaction,
3 MnO 42– + 2 H 2 O ⇌ 2 MnO 4– + MnO 2 + 4 OH–
The reagent that facilitates the removal of OH– ions to ensure the completion of the conversion of K2MnO4 to KMnO4 is:
1. KOH
2. CO2
3. SO2
4. HCl
3 MnO 42– + 2 H 2 O ⇌ 2 MnO 4– + MnO 2 + 4 OH–
The reagent that facilitates the removal of OH– ions to ensure the completion of the conversion of K2MnO4 to KMnO4 is:
1. KOH
2. CO2
3. SO2
4. HCl
Subtopic: Chemistry of Mn and Cr Compounds |
From NCERT
AIPMT - 2013
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The incorrect statement among the following regarding interstitial compounds is:
1. They are chemically reactive.
2. They are much harder than the pure metal.
3. They have a higher melting point than pure metals.
4. They retain metallic conductivity.
Subtopic: d-Block Elements- Properties & Uses |
80%
From NCERT
AIPMT - 2013
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Which of the following statements is false?
| 1. | On passing H2S through acidified K2Cr2O7 solution, a milky colour is observed. |
| 2. | Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis. |
| 3. | K2Cr2O7 solution in an acidic medium is orange. |
| 4. | K2Cr2O7 solution becomes yellow in increasing the pH beyond 7 |
Subtopic: d-Block Elements- Properties & Uses |
69%
From NCERT
AIPMT - 2012
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For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order?
(At. No Cr= 24, Mn= 25, Fe=26, Co= 27)
1. Fe>Mn>Co>Cr
2. Co>Mn>Fe>Cr
3. Cr>Mn>Co>Fe
4. Mn>Fe>Cr>Co
Subtopic: d-Block Elements- Properties & Uses |
65%
From NCERT
AIPMT - 2011
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