Practice questions
88551 published questions with worked solutions.
- A ball is dropped from the top of a 100 m high tower on a planet. In the last 1 2 s before hitting the ground, it covers a...
- An asteroid is moving directly towards the centre of the earth. When at a distance of 10 R (R is the radius of the earth) from...
- The increasing order of the atomic radii of the following elements is : (a) C (b) O (c) F (d) Cl (e) Br
- For the following Assertion and Reason, the correct option is : Assertion : The pH of water increase with increase in...
- White phosphorus on reaction with concentrated NaOH solution in an inert atmosphere of CO_2 gives phosphine and compound (X). (X)...
- Among (a) – (d), the complexes that can display geometrical isomerism are : (a) [ Pt(NH_3)_3Cl ]^+ (b) [ Pt(NH_3)Cl_5 ]^- (c) [...
- For the following Assertion and Reason, the correct option is : Assertion : For hydrogenation reactions, the catalytic activity...Not in JEE Main or NEET syllabus
- Among the reactions (a)-(d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are :...Not in JEE Main or NEET syllabus
- A metal (A) on heating in nitrogen gas gives compound B. B on treatment with H_2O gives a colourless gas which when passed...
- Two monomers in maltose are :
- The correct order of the calculated spin-only magnetic moments of complexes (A) to (D) is : (A) Ni(CO)_4 (B) [ Ni(H_2O)_6 ] Cl_2...
- Hydrogen has three isotopes (A), (B) and (C). If the number of neutron(s) in (A), (B) and (C) respectively, are (x), (y) and (z),...
- Arrange the following bonds according to their average bond energies in descending order: C–Cl, C–Br, C–F, C–I
- Preparation of Bakelite proceeds via reactions :
- The radius of the second Bohr orbit, in terms of the Bohr radius, a_0, in Li^ 2+ is :
- In the following sequence of reactions the maximum number of atoms present in molecule 'C' in one plane is ________. A [ Cu tube...
- For an electrochemical cell Sn(s)|Sn^ 2+ (aq, 1M)||Pb^ 2+ (aq, 1M)|Pb(s) the ratio [ Sn^ 2+ ] [ Pb^ 2+ ] when this cell attains...
- The mirror image of the point (1,2,3) in a plane is (- 7 3 ,- 4 3 ,- 1 3 ). Which of the following points lies on this plane ?
- If and be the coefficients of x^4 and x^2 respectively in the expansion of (x+ x^2-1 )^6+ (x- x^2-1 )^6, then :
- The area (in sq. units) of the region (x,y) R^2: x^2 y 3-2x , is :