JEE Mains · Chemistry · STD 12 - 4. d and f- block elements
On heating a mixture of common salt and \(K_{2}Cr_{2}O_{7}\) with concentrated \(H_{2}SO_{4}\), a gas is evolved. Formula of the gas evolved and oxidation state of the central metal atom in the gas respectively are:
- A \(CrO_{2}Cl_{2}\) and +5
- B \(CrO_{2}Cl_{2}\) and +6
- C \(Cr_{2}O_{2}Cl_{2}\) and +6
- D \(Cr_{2}O_{2}Cl_{2}\) and +3
Answer & Solution
Correct Answer
(B) \(CrO_{2}Cl_{2}\) and +6
Step-by-step Solution
Detailed explanation
\(4 NaCl + K _2 Cr _2 O _7+6 H _2 SO _4\) \(\longrightarrow 2 KHSO _4+2 CrO _2 Cl _2+4 NaHSO _4+3 H _2 O\) (Chromyl chloride) In Chromyl chloride Cr is in +6 oxidation state.
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 osmotic pressure of a dilute solution of an ionic compound \(XY\) in water is four times that of a solution of \(0.01\,M\,BaCl_2\) in water. Assuming complete dissociation of the given ionic compounds in water, the concentration of \(XY\) (in \(mol\,L^{-1}\)) in solution isJEE Mains 2019 Hard
- From the vitamins \(\mathrm{A}, \mathrm{B}_1, \mathrm{~B}_6, \mathrm{~B}_{12}, \mathrm{C}, \mathrm{D}, \mathrm{E}\) and \(\mathrm{K}\), the number vitamins that can be stored in our body is _______.JEE Mains 2024 Hard
- Salicylaldehyde is synthesized from phenol, when reacted with _______.JEE Mains 2024 Hard
- The first ionization enthalpy of \(Na , Mg\) and \(Si\), respectively, are: \(496,737\) and \(786\; kJ\; mol ^{-1}\). The first ionization enthalpy \(( kJ\; mol ^{-1})\) of \(Al\) isJEE Mains 2022 Easy
- Which of the following has unpaired electron \((s)\) ?JEE Mains 2014 Hard
- \(NaOH\) is a strong base. What will be \(pH\) of \(5.0 \times 10^{-2}\,M\) \(NaOH\) solution \((log\,2 = 0.3)\)JEE Mains 2013 Medium
More PYQs from JEE Mains
- The area of the region, inside the ellipse \( x^{2}+4y^{2}=4 \) and outside the region bounded by the curves \( y=|x|-1 \) and \( y=1-|x| \), is:JEE Mains 2026 Medium
- A uniform solid cylinder of length \(L\) and radius \(R\) has moment of inertia about its axis equal to \(I_1\). A small co-centric cylinder of length \(L / 2\) and radius \(R / 3\) carved from this cylinder has moment of inertia about its axis equals to \(I_2\). The ratio \(I_1 / I_2\) is _________ .JEE Mains 2026 Hard
- A coil of circular cross-section having \(1000\, turns\) and \(4\, cm^2\) face area is placed with its axis parallel to a magnetic field which decreases by \(10^{-2}\, Wb\, m^{-2}\) in \(0.01\, s\). The \(e.m.f.\) induced in the coil is....\(mV\)JEE Mains 2014 Medium
- Let \(f(x)\) be a function satisfying \(f(x)+f(\pi-x)=\) \(\pi^2, \forall x \in R\). Then \(\int \limits_0^\pi f(x) \sin x d x\) is equal to \(...........\).JEE Mains 2023 Hard
- Given below are two statements: One is labelled as Assertion \(A\) and the other is labelled as Reason \(R\). Assertion \(A:\) Two metallic spheres are charged to the same potential. One of them is hollow and another is solid, and both have the same radii. Solid sphere will have lower charge than the hollow one. Reason \(R:\) Capacitance of metallic spheres depend on the radii of spheres. In the light of the above statements, choose the correct answer from the options given below.JEE Mains 2023 Medium
- In a screw gauge, \(5\) complete rotations of the screw cause it to move a linear distance of \(0.25\, cm\). There are \(100\) circular scale divisions. The thickness of a wire measured by this screw gauge gives a reading of \(4\) main scale divisions and \(30\) circular scale divisions . Assuming negligible zero error, the thickness of the wire isJEE Mains 2018 Medium