Practice questions
88551 published questions with worked solutions.
- The elastic limit of brass is 379 MPa. What should be the minimum diameter of a brass rod if it is to support a 400 N load...
- The noble gas that does not occur in the atmosphere is:
- The highest possible oxidation states of uranium and plutonium, respectively are:
- In chromatography, which of the following statements is incorrect for R_f?
- The number of pentagons in C_ 60 and trigons (triangles) in white phosphorus, respectively, are:
- For the reaction of H_2 with I_2, the rate constant is 2.5 10^ -4 dm^3 mol^ -1 s^ -1 at 327°C and 1.0 dm^3 mol^ -1 at 527°C. The...
- The correct match between Item-I and Item-II is: List-I: (a) High density polythene (b) Polyacrylonitrile (c) Novolac (d) Nylon 6...Not in JEE Main or NEET syllabus
- The correct order of the first ionization enthalpies is:
- For the reaction, 2SO_2(g) + O_2(g) ⇌ 2SO_3(g), ΔH = −57.2 kJ mol^ -1 and K_C = 1.7 10^ 16 . Which of the following statement is...
- The difference between ΔH and ΔU (ΔH − ΔU), when the combustion of one mole of heptane (l) is carried out at a temperature T, is...
- The pH of a 0.02 M NH_4Cl solution will be [given K_b(NH_4OH) = 10^ -5 and log 2 = 0.301]
- Which of these factors does not govern the stability of a conformation in acyclic compounds?
- The correct statements among (a) to (d) are: (a) saline hydrides produce H_2 gas when reacted with H_2O. (b) reaction of LiAlH_4...Not in JEE Main or NEET syllabus
- The increasing order of nucleophilicity of the following nucleophiles is: (a) CH_3CO_2^ (b) H_2O (c) CH_3SO_3^ (d) O H
- Air pollution that occurs in sunlight is:Not in JEE Main or NEET syllabus
- If _ x 1 x^2-ax+b x-1 = 5, then a + b is equal to:
- The locus of the centres of the circles, which touch the circle, x^2 + y^2 = 1 externally, also touch the y-axis and lie in the...
- The number of real roots of the equation 5 + |2^x - 1| = 2^x(2^x - 2) is:
- A spherical iron ball of radius 10 cm is coated with a layer of ice of uniform thickness that melts at a rate of 50 cm^3/min....
- The sum 1 + 1^3+2^3 1+2 + 1^3+2^3+3^3 1+2+3 + + 1^3+2^3+3^3+ +15^3 1+2+3+ +15 - 1 2 (1+2+3+ +15) is equal to: