JEE Main questions
34495 published questions with worked solutions.
- Liquid A and B form an ideal solution. The vapour pressures of pure liquids A and B are 350 and 750 mm Hg respectively at the...
- ln SO₂, NO_2^- and N_3^- the hybridization at the central atom are respectively
- Given below are two statements Statement I: On hydrolysis, oligo peptides give rise to fewer number of α-amino acids while...
- 'X' is the number of acidic oxides among VO₂, V₂O₃, CrO₃, V₂O₅ and Mn₂O₇. The primary valency of cobalt in...
- Choose the incorrect trend in the atomic radii (r) of the elements.
- The extra stability of half-filled subshell is due to : (A) Symmetrical distribution of electrons (B) Smaller coulombic repulsion...
- The hydration energies of K⁺ and Cl⁻ are –x and –y kJ/mol respectively. If lattice energy of KCl is –z kJ/mol, then the heat of...
- Butane reacts with oxygen to produce carbon dioxide and water following the equation given below. C_4H_ 10 (g) + 13 2 O_2(g)...
- One litre buffer solution was prepared by adding 0.10 mol each of NH₃ and NH₄Cl in deionised water. The change in pH on addition...
- The number of paramagnetic metal complex species among [Co(NH₃)₆]³⁺, [Co(C₂O₄)₃]³⁻, [MnCl₆]³⁻, [Mn(CN)₆]³⁻, [CoF₆]³⁻, [Fe(CN)₆]³⁻...
- Let A and B be two sets, then (A B)' (A' B) is equal to
- If S is a set with 10 elements and A= (x,y):x,y S, x y , then the number of elements in A is
- For any two sets A and B, if A X=B X= and A X=B X for some set X, then (AMU 2009)
- The shaded region in the figure represents
- Let X and Y be the sets of all positive divisors of 400 and 1000 respectively (including 1 and the number). Then, n(X Y) is equal...
- A class has 175 students. The following data shows the number of students opting one or more subjects: Mathematics 100; Physics...
- Let S= 1,2,3,4 . The total number of unordered pairs of disjoint subsets of S is equal to
- Suppose A_1,A_2, ,A_ 30 are thirty sets, each having 5 elements, and B_1,B_2, ,B_n are n sets, each with 3 elements. Let _ i=1 ^...
- Let Z denote the set of all integers and A= (a,b):a^2+3b^2=28, a,b Z and B= (a,b):a>b, a,b Z . Then, the number of elements in A...
- If A= 1,2,3 and B= a,b , then A B is (DCE 2004)