Chemistry questions
29404 published questions with worked solutions.
- The vapour pressures of A and B at 25°C are 90 mm Hg and 15 mm Hg respectively. If A and B are mixed such that the mole fraction...
- 4g equimolar mixture of NaOH and Na_2CO_3 contains x g of NaOH and y g of Na_2CO_3. The value of x is _______g. (Nearest integer)
- When 0.15 g of an organic compound was analyzed using Carius method for estimation of bromine, 0.2397 g of AgBr was obtained. The...
- 100 ml of 0.0018% (w/v) solution of Cl^- ion was the minimum concentration required to precipitate a negative sol in one h. The...Not in JEE Main or NEET syllabus
- PCl_5(g) PCl_3(g)+Cl_2(g). In the above first order reaction the concentration of PCl_5 reduces from initial concentration 50 mol...
- Diamond has a three dimensional structure of C atoms formed by covalent bonds. The structure of diamond has face centred cubic...Not in JEE Main or NEET syllabus
- An aqueous solution of NiCl_2 was heated with excess sodium cyanide to form [Ni(CN)_6]^ 2- . The total change in number of...
- Green chemistry in day–to–day life is in the use of:Not in JEE or NEET syllabus
- The correct order of intensity of colors of the compounds is :
- The species given below that does NOT show disproportionation reaction is :
- Orlon fibres are made up of :Not in JEE Main or NEET syllabus
- Given below are two statements : One is labelled as Assertion A and other is labelled as Reason R. Assertion A : The dihedral...
- Chemical nature of the nitrogen oxide compound obtained from a reaction of concentrated nitric acid and P_4O_ 10 (in 4 : 1 ratio)...
- A s-block element (M) reacts with oxygen to form an oxide of the formula MO_2. The oxide is pale yellow in colour and...Not in JEE Main or NEET syllabus
- The metal that can be purified economically by fractional distillation method is:Not in JEE Main or NEET syllabus
- Compound A is converted to B on reaction with CHCl_3 and KOH. The compound B is toxic and can be decomposed by C. A, B and C...
- The conditions given below are in the context of observing Tyndall effect in colloidal solutions: (A) The diameter of the...Not in JEE Main or NEET syllabus
- The number of lone pairs of electrons on the central I atom in I_3^- is _________.
- 250 mL of 0.5 M NaOH was added to 500 mL of 1 M HCl. The number of unreacted HCl molecules in the solution after complete...
- The Azimuthal quantum number for the valence electrons of Ga^+ ion is _________. (Atomic number of Ga = 31)