Practice questions
88551 published questions with worked solutions.
- Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar ?
- A gaseous hydrocarbon gives upon combustion 0.72 g. of water and 3.08 g. of CO₂. The empirical formula of the hydrocarbon is -
- The rate of a reaction doubles when its temperature changes from 300 K to 310 K. Activation energy of such a reaction will be :...
- A compound with molecular mass 180 is acylated with CH₃COCl to get a compound with molecular mass 390. The number of amino groups...
- Which one of the following molecules is expected to exhibit diamagnetic behaviour ?
- In which of the following pairs of molecules/ions, both the species are not likely to exist ?
- The coagulating power of electrolytes having ions Na⁺, Al³⁺ and Ba²⁺ for arsenic sulphide sol increases in the order -Not in JEE Main or NEET syllabus
- Consider the following reaction : xMnO_4^- + yC_2O_4^ 2- + zH^+ xMn^ 2+ + 2yCO_2 + z 2 H_2O The values of x, y and z in the...
- Which of the following exists as covalent crystals in the solid state ?Not in JEE Main or NEET syllabus
- A solution of (–) – 1 – chloro – 1 – phenylethane in toluene racemises slowly in the presence of a small amount of SbCl₅, due to...
- An unknown alcohol is treated with the "Lucas reagent" to determine whether the alcohol is primary, secondary or tertiary. Which...
- How many litres of water must be added to 1 litre of an aqueous solution of HCl with a pH of 1 to create an aqueous solution with...
- The molarity of a solution obtained by mixing 750 mL of 0.5(M)HCl with 250 ml of 2(M)HCl will be -
- A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0ºC. As...
- Stability of the species Li_2, Li_2^- and Li_2^+ increases in the order of -
- Synthesis of each molecule of glucose in photosynthesis involves -
- Given E^0_ Cr^ 3+ /Cr = -0.74 V; E^0_ MnO_4^-/Mn^ 2+ = 1.51 V E^0_ Cr_2O_7^ 2- /Cr^ 3+ = 1.33 V; E^0_ Cl/Cl^- = 1.36 V Based on...
- If the domain of the function f(x) = ^ -1 ( 2x-5 11-3x ) + ^ -1 (2x^2 - 3x + 1) is the interval [ , ], then + 2 is equal to :
- The number of relations, defined on the set a, b, c, d , which are both reflexive and symmetric, is equal to:
- Let a = - i + 2 j + 2 k , b = 8 i + 7 j - 3 k and c be a vector such that a c = b . If c ( i + j + k ) = 4, then | a + c |^2 is...