JEE Mains · Chemistry · STD 12 - 4. d and f- block elements
On treating a compound with warm dil. \(H _{2} SO _{4}\), gas \(X\) is evolved which turns \(K _{2} Cr _{2} O _{7}\) paper acidified with dil. \(H _{2} SO _{4}\) to a green compound \(Y. X\) and \(Y\) respectively are
- A \(X = SO _{2}, Y = Cr _{2} O _{3}\)
- B \(X = SO _{3}, Y = Cr _{2} O _{3}\)
- C \(X = SO _{2}, Y = Cr _{2}\left( SO _{4}\right)_{3}\)
- D \(X = SO _{3}, Y = Cr _{2}\left( SO _{4}\right)_{3}\)
Answer & Solution
Correct Answer
(C) \(X = SO _{2}, Y = Cr _{2}\left( SO _{4}\right)_{3}\)
Step-by-step Solution
Detailed explanation
\(SO _{2}+ dil H _{2} SO _{4} \longrightarrow SO _{3}( g )\) \(Cr _{2}\left( SO _{4}\right)_{3}\)
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
- According to molecular theory, the species among the following that does not exist isJEE Mains 2021 Easy
- Given below are two statements: Statement \((I)\) : A \(\pi\) bonding \(MO\)has lower electron density above and below the inter-nuclear axis. Statement \((II)\) : The \(\pi^*\) antibonding \(MO\) has a node between the nucles.
In the light of the above statements, choose the most appropriate answer from the options given below:JEE Mains 2024 Hard - An ideal gas undergoes isothermal expansion at constant pressure. During the processJEE Mains 2017 Hard
- An exothermic reaction \(X \rightarrow Y\) has an activation energy \(30\, kJ \,mol ^{-1}\). If energy change \(\Delta E\) during the reaction is \(-20\, kJ ,\) then the activation energy for the reverse reaction in \(kJ\) is \(...\).(Integer answer)JEE Mains 2021 Easy
- Ejection of the photoelectron from metal in the photoelectric effect experiment can be stopped by applying \(0.5\,V\) when the radiation of \(250\, nm\) is used. The work function of the metal is ................ \(\mathrm{eV}\)JEE Mains 2018 Hard
- For any given series of spectral lines of atomic hydrogen, let \(\Delta \bar V\, = \,\Delta {\bar V_{\max }}\, - \,\Delta {\bar V_{\min }}\) be the difference in maximum and minimum frequencies in \(cm^{-1}.\) the ration \(\Delta {\bar V_{Lymann}}/\,\Delta {\bar V_{Balmer}}\) isJEE Mains 2019 Medium
More PYQs from JEE Mains
- Following statements related to radioactivity are given below \((A)\) Radioactivity is a random and spontaneous process and is dependent on physical and chemical conditions. \((B)\) The number of un-decayed nuclei in the radioactive sample decays exponentially with time. \((C)\) Slope of the graph of \(\log _{e}\) (no. of undecayed nuclei) \(Vs\). time represents the reciprocal of mean life time \((\tau)\). \((D)\) Product of decay constant ( \(\lambda\) ) and half-life time \(\left(T_{1 / 2}\right)\) is not constant. Choose the most appropriate answer from the options given belowJEE Mains 2022 Hard
- The heat of combustion of ethanol into carbon dioxides and water is \(-327\, kcal\) at constantpressure. The heat evolved (in cal) at constant volume and \(27^{\circ} C\) (if all gases behave ideally) is \(\left( R =2\, cal\, mol ^{-1}\, K ^{-1}\right)\)JEE Mains 2020 Hard
- Given below are two statements:
Statement I:
can be synthesized from 
using simpler reagents in the order i) Acidic \(KMnO _4\), ii) Ammonia, iii) Bromine and alkali
Statement II :
can be converted into 
using reagents in the order (i) Bromine- \(H _2 O\) (ii) \(NaNO _2 / HCl \left(0-5^{\circ} C \right)\) (iii) aq. \(H _3 PO _2\).
In the light of the above statements, choose the correct answer from the options given belowJEE Mains 2026 Easy - The bond order and the magnetic characteristics of \(CN^-\) areJEE Mains 2020 Hard
- Arrange the following elements in the increasing order of number of unpaired electrons in it. \((A)\) \(\mathrm{Sc}\) \((B) \mathrm{Cr}\) \((C) \mathrm{V}\) \((D)\) \(\mathrm{Ti}\) \((E)\) \(\mathrm{Mn}\) Choose the correct answer from the options given below:JEE Mains 2024 Medium
- Which of the following reagents\(/\) reactions will convert \('A'\) to \('B'\)?
JEE Mains 2022 Medium