CUET · CHEMISTRY · PYQ PAPER 2025
What is the oxidation number of the metal of \([Co(H_2O)(CN)(ox)_2]^{2-}\) coordination entity?
- A +5
- B +1
- C +3
- D +2
Answer & Solution
Correct Answer
(C) +3
Step-by-step Solution
Detailed explanation
Let oxidation number of Co be \(x\). \(x + (0) + (-1) + 2(-2) = -2\) \(x - 5 = -2\) \(x = +3\)
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
- The correct IUPAC name of the following organic compound is
CUET 2025 Easy - On the basis of following observations arrange the following compounds in increasing order of mol of AgCl precipitated per mol of the compound with excess of AgNO3
Choose the correct answer from the options given below:Formula Secondary valences Solution conductivity (A) PdCl2.4NH3 4 1:2 electrolyte (B) NICI4.2K 4 2:1 electrolyte (C) CoCl3.4NH3 6 1:1 electrolyte (D) CrCl3.6H2O 6 1:3 electrolyte CUET 2025 Medium - For (i) \(I^-\) (ii) \(Cl^-\)(iii) \(Br^-\), the usual increasing order of nucleophilicities would beCUET 2023 Hard
- The rate constant for the first order decomposition of \(H _2 O _2\) is given by:\[ \log k=15-\frac{1.2 \times 10^2}{T}\] The activation energy ( \(E_a\) ) would be:CUET 2023 Hard
- The flocculating power of \(\left[ Fe ( CN )_6\right]^{4-}\) is higher than \(PO _4^{3-}\) ion because :CUET 2023 Easy
- The unit of rate constant of a reaction with the rate law, Rate \(=k[A]^{3 / 2}[B]^{-1}\) isCUET 2025 Hard
More PYQs from CUET
- If \(f(x)=-3 x^2\), then \(f(x)\) is:CUET 2023 Medium
- Which is known as 'Terror of Bengal'.?CUET 2023 Easy
- For an endothermic reaction, energy of activation is \(E_a\) and enthalpy of reaction is \(\Delta H\)
(both of these are in \(kJ'\) mol\(^{-1}\)), minimum value of \(E_a\) will be :CUET 2023 Easy - At what rate of interest will the present value of a perpetuity of Rs. 1000 payable at the end of every six months be Rs. 20000?CUET 2025 Hard
- Consider the following statements for the order of a reaction and choose the correct statements.
(A). The order of a reaction is an experimental quantity.
(B). Order can be zero.
(C). Order can be fractional value.
(D). Order is applicable to elementary as well as complex reactions.
Choose the correct answer from the options given below :CUET 2025 Easy - Which one of the given approaches is used when the animals and plants are endangered?CUET 2025 Hard