JEE Mains · Chemistry · STD 12 - 4. d and f- block elements
In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is \((+)\) ________.
- A \(4\)
- B \(6\)
- C \(8\)
- D \(10\)
Answer & Solution
Correct Answer
(B) \(6\)
Step-by-step Solution
Detailed explanation
\(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7(\mathrm{~s})+4 \mathrm{KCl}(\mathrm{s})+6 \mathrm{H}_2 \mathrm{SO}_4 \text { (conc.) }\) \(\rightarrow 2 \mathrm{CrO}_2 \mathrm{Cl}_2(\mathrm{~g})+6 \mathrm{KHSO}_4+3 \mathrm{H}_2 \mathrm{O}\) This reaction is called chromyl chloride…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
-

In the given TLC, the distance of spot A & B are \(5 cm \& 7 cm\), from the bottom of TLC plate, respectively.
\(R _{ f }\) value of B is \(x \times 10^{-1}\) times more than A . The value of \(x\) is _______.JEE Mains 2024 Medium - Compound \('P'\) on nitration with dil. \(HNO _{3}\) yields two isomers \((A)\) and \((B).\) These isomers can be separated by steam distillation. Isomers \((A)\) and \((B)\) show the intramolecular and intermolecular hydrogen bonding respectively. Compound \((P)\) on reaction with conc. \(HNO _{3}\) yields a yellow compound \('C',\) a strong acid. The number of oxygen atoms is present in compound \({ }^{\prime} C'\,....\)JEE Mains 2022 Medium
- Given below are two statements: one is labelled as Assertion \((A)\) and the other is labelled as Reason \((R).\) Assertion \((A):\) Synthesis of ethyl phenyl ether may be achieved by Williamson synthesis. Reason \((R):\) Reaction of bromobenzene with sodium ethoxide yields ethyl phenyl ether. In the light of the above statements, choose the most appropriate answer from the options given below:JEE Mains 2021 Medium
- Match the LIST-I with LIST-II
List-I (Compound) List-II (Test) A. Cyclohexanol I. Hinsberg's reagent test B. Cyclohexylamine II. Phthalein dye test C. Cyclohexanecarbaldehyde III. Lucas test D. Phenol IV. Tollen's test
Choose the correct answer from the options given below:JEE Mains 2026 Medium - Correct statement is :JEE Mains 2023 Medium
- The correct pair(s) of the ambident nucleophiles is (are): \((A)\) \(AgCN / KCN\) \((B)\) \(RCOOAg / RCOOK\) \((C)\) \(AgNO _{2} / KNO _{2}\) \((D)\) \(AgI / KI\)JEE Mains 2021 Medium
More PYQs from JEE Mains
- Let \(O\) be the origin and the position vector of the point \(P\) be \(-\hat{i}-2 \hat{j}+3 \hat{k}\). If the position vectors of the points \(A , B\) and \(C\) are \(-2 \hat{i}+\hat{j}-3 \hat{k}, 2 \hat{i}+4 \hat{j}-2 \hat{k}\) and \(-4 \hat{i}+2 \hat{j}-\hat{k}\) respectively then the projection of the vector \(\overline{O P}\) on a vector perpendicular to the vectors \(\overline{A B}\) and \(\overline{A C}\) is \(......\).JEE Mains 2023 Hard
- In a Vernier calipers, when both jaws touch each other, zero of the Vernier scale is shifted to the right of zero of the main scale and \(7^{\text{th}}\) Vernier division coincides with a main scale reading. If the value of \(1\) main scale division is \(1\) mm and there are \(10\) Vernier scale divisions, then the Vernier caliper hasJEE Mains 2026 Medium
- Let \([x]\) denote the greatest integer function, and let m and n respectively be the numbers of the points, where the function \(f(x)=[x]+|x-2|,-2 \lt x \lt 3\), is not continuous and not differentiable. Then \(\mathrm{m}+\mathrm{n}\) is equal to :JEE Mains 2025 Medium
- Match List\(-I\) with List\(-II :\)
Choose the correct answer form the options given below :List\(-I\) (Species) List\(-II\) (Hybrid Orbitals) \((a)\) \(\mathrm{SF}_{4}\) \((i)\) \(\mathrm{sp}^{3} \mathrm{~d}^{2}\) \((b)\) \(\mathrm{IF}_{5}\) \((ii)\) \(\mathrm{d}^{2} \mathrm{sp}^{3}\) \((c)\) \(\mathrm{NO}_{2}^{+}\) \((iii)\) \(\mathrm{sp}^{3} \mathrm{~d}\) \((d)\) \(\mathrm{NH}_{4}^{+}\) \((iv)\) \(\mathrm{sp}^{3}\) \((v)\) \(\mathrm{sp}\) JEE Mains 2021 Hard - Two equal capacitors are first connected in series and then in parallel. The ratio of the equivalent capacities in the two cases will beJEE Mains 2021 Medium
- A potential divider circuit is connected with a DC source of \(20 \mathrm{~V}\), a light emitting diode of glow in voltage \(1.8 \mathrm{~V}\) and a zener diode of breakdown voltage of \(3.2 \mathrm{~V}\). The length (PR) of the resistive wire is \(20 \mathrm{~cm}\). The minimum length of \(P Q\) to just glow the LED is _______ cm.
JEE Mains 2024 Hard