JEE Mains · Chemistry · STD 12 - 10. Biomolecules
Which of the following gives a positive test with ninhydrin?
- A Cellulose
- B Starch
- C Polyvinyl chloride
- D Egg albumin
Answer & Solution
Correct Answer
(D) Egg albumin
Step-by-step Solution
Detailed explanation
Ninhydrin test is a test of amino acids. Egg albumin contains protein which is a natural polymer of amino acids which will show positive ninhydrin test
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
- A solid \(XY\) kept in an evacuated sealed container undergoes decomposition to form a mixture of gases \(X\) and \(Y\) at temperature \(T\). The equilibrium pressure is \(10\, bar\) in the vessel. \(K_p\) for this reaction isJEE Mains 2016 Medium
- Time required for \(99.9 \%\) completion of a first order reaction is _______ time the time required for completion of \(90 \%\) reaction.(nearest integer).JEE Mains 2024 Medium
- What is the mole fraction of water in \(10\)% by weight (w/w) of aqueous urea solution?
[Given: Molar mass of H, O, C and N are \(1\), \(16\), \(12\) and \(14\) g mol\(^{-1}\) respectively.]JEE Mains 2026 Easy - Consider the following redox reaction : \(\mathrm{MnO}_4^{-}+\mathrm{H}^{+}+\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4 \rightleftharpoons \mathrm{Mn}^{2+}+\mathrm{H}_2 \mathrm{O}+\mathrm{CO}_2\) The standard reduction potentials are given as below \(\left(\mathrm{E}_{\mathrm{red}}^{\circ}\right)\) \(\mathrm{E}_{\mathrm{MmO}_4^{-} / \mathrm{Mm}^{2+}}^{\circ}=+1.51 \mathrm{~V}\) \(\mathrm{E}_{\mathrm{CO}_2 / \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4}^{\circ}=-0.49 \mathrm{~V}\) If the equilibrium constant of the above reaction is given as \(K_{\text {eq }}=10^x\), then the value of \(x=\)_______. (nearest integer)JEE Mains 2024 Hard
- 0.01 mole of an organic compound \((X)\) containing \(10 \%\) hydrogen, on complete combustion produced \(0.9 \mathrm{~g} \mathrm{H}_2 \mathrm{O}\). Molar mass of \((\mathrm{X})\) is _____ \(\mathrm{g} \mathrm{mol}^{-1}\).JEE Mains 2025 Medium
- One mole each of He and \(A(g)\) are taken in a \(10\) L closed flask and heated to \(400\) K to establish the following equilibrium. \(A(g) \rightleftharpoons B(g)\). \(K_c\) for this reaction at \(400\) K is \(4.0\). The partial pressures (in atm) of He and \(B(g)\) are respectively (at equilibrium) (Assume He, \(A(g)\) and \(B(g)\) behave as ideal gases) (Given: \(R = 0.082\) L atm K\(^{-1}\) mol\(^{-1}\))JEE Mains 2026 Medium
More PYQs from JEE Mains
- The equation of current in a purely inductive circuit is \(5 \sin \left(49 \pi t-30^{\circ}\right)\). If the inductance is \(30\,mH\) then the equation for the voltage across the inductor, will be.\(\left\{\right.\) Let \(\left.\pi=\frac{22}{7}\right\}\)JEE Mains 2022 Medium
- The decomposition of formic acid on gold surface follows first order kinetics. If the rate constant at \(300\, K\) is \(1.0 \times 10^{-3} s ^{-1}\) and the activation energy \(E _{ a }=11.488\, kJ\, mol ^{-1},\) the rate constant at \(200\, K\) is ............ \(\quad \times 10^{-5} s ^{-1} .\) (Round of to the Nearest Integer). (Given : \(\left. R =8.314\, J\, mol ^{-1} K ^{-1}\right)\)JEE Mains 2021 Hard
- Which of the given reactions is not an example of disproportionation reaction?JEE Mains 2022 Medium
- A thin ring of \(10\, cm\) radius carries a uniformly distributed charge. The ring rotates at a constant angular speed of \(40\,\pi \,rad\,{s^{ - 1}}\) about its axis, perpendicular to its plane. If the magnetic field at its centre is \(3.8 \times {10^{ - 9}}\,T\), then the charge carried by the ring is close to \(\left( {{\mu _0} = 4\pi \times {{10}^{ - 7}}\,N/{A^2}} \right)\)JEE Mains 2019 Medium
- If \(\alpha \) and \(\beta \) are roots of the equation \(x^2 + px + \frac {3p}{4} = 0,\) such that \(\left| {\alpha - \beta } \right| = \sqrt {10} ,\) then \(p\) belongs to the setJEE Mains 2013 Hard
- Let \(P\) be the foot of the perpendicular from the point \(Q(10,-3,-1)\) on the line \(\frac{x-3}{7}=\frac{y-2}{-1}=\frac{z+1}{-2}\). Then the area of the right angled triangle \(P Q R\), where \(R\) is the point \((3,-2,1)\), isJEE Mains 2025 Medium