JEE Main questions
34495 published questions with worked solutions.
- An aqueous solution contains an unknown concentration of Ba^ 2+ . When 50 mL of a 1 M solution of Na_2SO_4 is added, BaSO_4 just...
- At 518°C, the rate of decomposition of sample of gaseous acetaldehyde, initially at a pressure of 363 Torr, was 1.00 Torr s^ -1...
- How long (approximate) should water be electrolysed by passing through 100 amperes current so that the oxygen released can...
- Which of the following compounds contains(s) no covalent bond(s) ? KCl, PH_3, O_2, B_2H_6, H_2SO_4
- Which of the following are Lewis acids ?
- Total number of lone pair of electrons in I_3^- ion is
- Hydrogen peroxide oxidises [Fe(CN)_6]^ 4- to [Fe(CN)_6]^ 3- in acidic medium but reduces [Fe(CN)_6]^ 3- to [Fe(CN)_6]^ 4- in...
- The oxidation states of Cr in [Cr(H_2O)_6]Cl_3, [Cr(C_6H_6)_2], and K_2[Cr(CN)_2(O)_2(O_2)(NH_3)] respectively are :
- When metal 'M' is treated with NaOH, a white gelatinous precipitate 'X' is obtained, which is soluble in excess of NaOH. Compound...Not in JEE Main or NEET syllabus
- Consider the following reaction and statements : [ Co(NH_3)_4Br_2 ]^+ + Br^- [ Co(NH_3)_3Br_3 ] + NH_3 (I) Two isomers are...
- Glucose on prolonged heating with HI gives :
- The trans-alkenes are formed by the reduction of alkynes with :
- An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination ?
- Let S = x R : x 0 and 2| x - 3| + x ( x - 6) + 6 = 0 . Then S :
- If , C are the distinct roots, of the equation x^2 - x + 1 = 0, then ^ 101 + ^ 107 is equal to
- If vmatrix x-4 & 2x & 2x 2x & x-4 & 2x 2x & 2x & x-4 vmatrix = (A + Bx)(x - A)^2, then the ordered pair (A, B) is equal to :
- If the system of linear equations x + ky + 3z = 0 3x + ky - 2z = 0 2x + 4y - 3z = 0 has a non-zero solution (x, y, z) then xz y^2...
- From 6 different novels and 3 different dictionaries, 4 novels and 1 dictionary are to be selected and arranged in a row on a...
- The sum of the co-efficients of all odd degree terms in the expansion of (x + x^3 - 1 )^5 + (x - x^3 - 1 )^5, (x > 1) is
- Let a_1, a_2, a_3, , a_ 49 be in A.P. such that _ k=0 ^ 12 a_ 4k+1 = 416 and a_9 + a_ 43 = 66. If a_1^2 + a_2^2 + + a_ 17 ^2 =...