JEE Mains · Chemistry · STD 12 - p -Block elements - ll
Molar mass of the salt from \(NaBr , NaNO _3, KI\) and \(CaF _2\) which does not evolve coloured vapours on heating with concentrated \(H _2 SO _4\) is _______ \(g mol ^{-1}\).
(Molar mass in \(\text{g mol} ^{-1}: Na : 23, N: 14, K: 39, O : 16, Br : 80,\) \(I : 127, F: 19, Ca : 40)\)
- A 68
- B 78
- C 88
- D 98
Answer & Solution
Correct Answer
(B) 78
Step-by-step Solution
Detailed explanation
\(CaF _2\) does not evolve any gas with concentrated \(H _2 SO _4\). \(NaBr \rightarrow\) evolve \(Br _2\) \(NaNO _3 \rightarrow\) evolve \(NO _2\) \(KI \rightarrow\) evolve \(I _2\)
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 ' spin only ' magnetic moment value of \(\mathrm{MO}_4{ }^{2-}\) is _______ BM. (Where \(\mathrm{M}\) is a metal having least metallic radii. among \(\mathrm{Sc}, \mathrm{Ti}, \mathrm{V}, \mathrm{Cr}, \mathrm{Mn}\) and \(\mathrm{Zn}\) ). (Given atomic number: \(\mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{~V}=23\), \(\mathrm{Cr}=24, \mathrm{Mn}=25\) and \(\mathrm{Zn}=30)\)JEE Mains 2024 Medium
- The electrode potential of the following half cell at \(298\,K\) \(X \left| X ^{2+}(0.001 M ) \| Y ^{2+}(0.01 M )\right| Y\) is \(.......\times 10^{-2} V\) (Nearest integer). Given: \(E _{ x ^{2+} \mid x }^0=-2.36\,V\) \(E _{ Y ^{3+} \mid Y }^0=+0.36\,V\) \(\frac{2.303\,RT }{ F }=0.06\,V\)JEE Mains 2023 Medium
- Match List - I with List - II.
List - I
VitaminList - II
NameA. Vitamin \(B_1\) I. Pyridoxine B. Vitamin \(B_2\) II. Ascorbic acid C. Vitamin \(B_6\) III. Thiamine D. Vitamin C IV. Riboflavin
Choose the correct answer from the options given below :JEE Mains 2026 Easy - When \(10\, \mathrm{~mL}\) of an aqueous solution of \(\mathrm{KMnO}_{4}\) was titrated in acidic medium, equal volume of \(0.1\) \(\mathrm{M}\) of an aqueous solution of ferrous sulphate was required for complete discharge of colour. The strength of \(\mathrm{KMnO}_{4}\) in grams per litre is \(......\,\times 10^{-2} .\) (Nearest integer) Atomic mass of \(\mathrm{K}=39, \mathrm{Mn}=55, \mathrm{O}=16]\)JEE Mains 2021 Medium
- Identify the reaction which does not liberate hydrogenJEE Mains 2016 Medium
- Formulae for Nessler's reagent is:JEE Mains 2023 Hard
More PYQs from JEE Mains
- A mass of \(50\, {kg}\) is placed at the centre of a uniform spherical shell of mass \(100\, {kg}\) and radius \(50 \,{m}\). If the gravitational potential at a point, \(25\, {m}\) from the centre is \({V} \,{kg} / {m} .\) The value of \({V}\) isJEE Mains 2021 Medium
- A deuteron and an alpha particle having equal kinetic energy enter perpendicular into a magnetic field. Let \(r_{d}\) and \(r_{\alpha}\) be their respective radii of circular path. The value of \(\frac{r_{d}}{r_{\alpha}}\) is equal toJEE Mains 2021 Medium
- If the length of the minor axis of ellipse is equal to half of the distance between the foci, then the eccentricity of the ellipse is :JEE Mains 2024 Hard
- Let \(\mathrm{A}(4,-2), \mathrm{B}(1,1)\) and \(\mathrm{C}(9,-3)\) be the vertices of a triangle \(A B C\). Then the maximum area of the parallelogram AFDE , formed with vertices \(\mathrm{D}, \mathrm{E}\) and F on the sides \(\mathrm{BC}, \mathrm{CA}\) and AB of the triangle ABC respectively, is ______ .JEE Mains 2025 Easy
- Let a straight line \(L\) pass through the point \(P(2,-1,3)\) and be perpendicular to the lines \(\frac{x-1}{2}=\frac{y+1}{1}=\frac{z-3}{-2}\) and \(\frac{x-3}{1}=\frac{y-2}{3}=\frac{z+2}{4}\). If the line \(L\) intersects the \(y z\)-plane at the point \(Q\), then the distance between the points \(P\) and \(Q\) is :JEE Mains 2025 Medium
- Given below are two statements: one is labelled as Assertion \((A)\) and the other is labelled as Reason \((R)\). Assertion \((A)\) : In aqueous solutions \(\mathrm{Cr}^{2+}\) is reducing while \(\mathrm{Mn}^{3+}\) is oxidising in nature. Reason \((R)\) : Extra stability to half filled electronic configuration is observed than incompletely filled electronic configuration. In the light of the above statement, choose the most appropriate answer from the options given below:JEE Mains 2024 Hard