Question:
Define Lanthanide contraction. Write the balanced chemical equation when acidified \( K_2Cr_2O_7 \) reacts with \( H_2S \).
Define Lanthanide contraction. Write the balanced chemical equation when acidified \( K_2Cr_2O_7 \) reacts with \( H_2S \).
Show Hint
The lanthanide contraction affects the chemistry of transition metals by rendering the 5d series elements comparably sized to their 4d series counterparts.
Updated On: Dec 23, 2025
Hide Solution
Verified By Collegedunia
Solution and Explanation
Lanthanide Contraction: The term "Lanthanide contraction" describes the progressive decrease in the atomic and ionic sizes of the elements in the lanthanide series. This phenomenon is attributed to the ineffective shielding of the nuclear charge by the 4f electrons.
Reaction of Acidified \( K_2Cr_2O_7 \) with \( H_2S \): \[ K_2Cr_2O_7 + 3H_2SO_4 + 3H_2S \rightarrow 2Cr_2(SO_4)_3 + 7H_2O + 3S \] This reaction illustrates the oxidizing power of potassium dichromate in an acidic medium, where it converts hydrogen sulfide to sulfur.
Was this answer helpful?
0
4
Top Questions on Inorganic chemistry
Nature of compounds TeO₂ and TeH₂ is___________ and ______________respectively.
- JEE Main - 2025
- Chemistry
- Inorganic chemistry
Match List I with List II:
Choose the correct answer from the options given below:- NEET (UG) - 2025
- Chemistry
- Inorganic chemistry
- Why does Vanadium pentoxide (V2O5) act as a catalyst?
- CBSE CLASS XII - 2025
- Chemistry
- Inorganic chemistry
- While doing qualitative analysis in chemistry lab, Abhishek added yellow coloured potassium chromate solution into a test tube. He was surprised to see the colour of the solution changing immediately to orange. He realised that the test tube was not clean and contained a few drops of some liquid. Which of the following substances will be the most likely liquid to be present in the test tube before adding potassium chromate solution?
- CBSE CLASS XII - 2025
- Chemistry
- Inorganic chemistry
- The correct order of atomic radii of C, Al and S is
- AP EAPCET - 2025
- Chemistry
- Inorganic chemistry
View More Questions
Questions Asked in Maharashtra Class XII exam
- What is value of B called, when H = 0 is in the hysteresis loop?
- If \(|\vec{a}| = 5\), \(|\vec{b}| = 13\), and \(|\vec{a} \times \vec{b}| = 25\), then \(|\vec{a} \cdot \vec{b}|\) is equal to ........
- Maharashtra Class XII - 2025
- Vector Algebra
- Calculate the electric field intensity at a point just near the surface of a charged plane sheet, measured from its mid-point. [ \( \sigma = 8.85 \, \mu C/m^2 \) ]
- Maharashtra Class XII - 2025
- Electrostatics
- Identify ‘A’ and ‘B’ in the following reaction and rewrite the complete reaction : \[ \text{CH}_3\text{-CH=CH}_2 \xrightarrow[\text{Peroxide}]{\text{HBr}} \text{A} \xrightarrow[\text{-KBr}]{\text{alcoholic KCN}} \text{B} \]
- Maharashtra Class XII - 2025
- Organic Chemistry
- Divide the number 20 into two parts such that the sum of their squares is minimum.
- Maharashtra Class XII - 2025
- Optimization
View More Questions