JEE Main Unofficial Answer Key 21 January 2026 LIVE Updates (AVAILABLE): Subject expert, coaching institute answer keys

JEE Main Unofficial Answer Key 21 January 2026 LIVE Updates:Today is the first day of the JEE Main Session 1 exam 2026. The shift 1 exam has already ended at 12 PM, and now, our CollegeDekho team is trying to connect to the test takers and collecting the memory-based questions. Next, our subject matter expert will analyse the paper and add the unofficial answers to the same. Along with this, candidates can also access subject-wise PDFs here, which will be released by the coaching institutes. This will enable candidates appearing for the JEE Main exam on 21 January to stay connected with this live blog and find the correct answers to the questions. It will, in turn, help them to assess their performance level before releasing the results.Also read lJEE Main Question Paper 2026 January 21: Memory-based questions Physics, Chemistry, and MathematicsJEE Main Predicted Percentile Score January 2026 Session 1 Live UpdatesJEE Main Unofficial Answer Key 21 January 2026 Shift 1 by CollegeDekhoCheck out the JEE Main 21 January shift 1 subject-wise questions and their correct answers here:Mathematics:QuestionsAnswers1.42.113.2/34.5. The sum of roots of the equation lx-1l2-5lx-1l+6=0 is46.28√3 (Not given as an option)7. Consider a set S={a,b,c,d}. The number of reflexive as well as symmetric relations from S------> S are648. The locus of the point of intersection of the tangent drawn to the circle (x-2)2+(y-3)2=16, which subtends an angle of 120°, is:3x2+3y2-12x-18y-25=09.7Physics:QuestionsAnswers1. A rod of mass m and length l is attached to two ideal strings. Find tension in the left string just after the right string is cutmg/42. Which logic gate is given in the figure?NAND gate3.ML-1T-44. Find the heat produced in the external circuit (AB) in one second.(21X15)/16 (Not given as an option)5. An α particle having kinetic energy 7.7 MeV is approaching a fixed gold nucleus (atomic number is 79). Find the distance of closest approach.1.72 nm6. An air-filled capacitor of capacitance C filled with dielectric (k=3) of width d/3, where d is sepration between plates. The new capacitance is:9C/7Chemistry:QuestionsAnswers1.Find A2.83. In 'S' estimation 0.7 g of an organic compound gives 1 g BaSO4in Carius method. What is the % of 'S' in the compound?19.614. Which one among the following resonating structures is not correct?Option A5. Statement A: but-2-e show O.I.Statement B: Propanol & Propanone are F.G.I.Statement C: Pentane & 2,2- Dimethyl Propane are C.I correctly statementOnly B and C6.% of N in E= ?20JEE Main Unofficial Answer Key 21 January 2026 Shift 2 by CollegeDekhoFind out the Day 1 shift 2 JEE Main Session 1 subject-wise unofficial answer key here:Physics:QuestionsAnswers1. In a circuit, there is a battery with internal resistance r and an emf E, which is connected to an external load resistance R as shown. Find the value of R so that the maximum power dissipates across R.R=r2. Refractive index of the prism is √2. What should be the angle of incidence for a light ray such that the emerging ray gazes out of the surface?90°3. Keeping the significant figures in view, the sum of the physical quantities 5.01 m, 153.2 m, and 0.123 m is205.3m4. The total length of potentiometer wire AB is shown in the arrangement in the fig. If P is the point where the galvanometer shows zero reading, then the length of AP is:305. the Kinetic energy of a simple harmonic oscillating with an angular frequency of 176 rad/s. The frequemcy of the simple harmonic oscillator is - Hz (π=22/7)88Mathematics:QuestionsAnswers1.1042.163. Let y2= 16x, from point (16, 16) a focal chord is passing. Point (α,β) divides the focal chord in ratio 2:3, then minimum value ofα+β is11Chemistry:QuestionsAnswers1. Statement I: The correct order for radius is Al>Mg>Mg2+>Al3+Statement II: Atomic size always depends on electronegativityChoose the correct optionBoth statements I and II are incorrect2.53. The rms speed of oxygen molecules at 47°C is equal to that of Hydrogen molecules kept at ____°C-2534. 1 g of an organic compound produces 1.49 g of Mg2P2O7. Determine % of Phosphorous?45%-46%5. Following 4 molecules are given, and among them, one is optically active. Find the percentage of carbon in that compound:a. n-propyl Chlorideb. iso-propyl Chloridec. iso-butyl Chlorided. Secondary-butyl chlorideOption d.JEE Main Unofficial Answer Key 21 January 2026 Shift 1 by Coaching InstitutesCandidates can find out the coaching institute-wise, subject-wise JEE Main Unofficial answer key for January 21 shift 1 here in the following table:Name of the Coaching InstituteShift 1 PDF LinksVedantuPhysics PDF LinkChemistry PDF LinkMathematics PDF LinkResonancePhysics PDF LinkChemistry PDF LinkMathematics PDF LinkAakashPhysics PDF LinkChemistry PDF LinkMathematics PDF LinkNarayana CollegeTo be updated once availableSri ChaitanyaTo be updated once availableReliable KotaTo be updated once availableMathonGoTo be updated once availableThe candidates will find out the day-wise and shift-wise JEE Main Session 1 exam analysis, released by the CollegeDekho subject matter experts and several coaching institutes. For getting the latest updates regarding Day 1 analysis, stay connected with this live blog.Also read lJEE Main Difficulty Level Analysis 2026 January 21: CollegeDekho difficulty level rating based on memory-based questionsJEE Main Paper Review 2026 January 21 (Available): Chemistry Moderate, Check student and expert reviews