Chemistry questions
29404 published questions with worked solutions.
- Element "E" belongs to the period 4 and group 16 of the periodic table. The valence shell electron configuration of the element,...
- Given are two statements one is labelled as Assertion A and other is labelled as Reason R. Assertion A : Magnesium can reduce Al_...Not in JEE Main or NEET syllabus
- Given below are two statements : Statement I : The pentavalent oxide of group-15 element, E_ 2 O_ 5 , is less acidic than...
- Which one of the lanthanoids given below is the most stable in divalent form?
- Given below are two statements: Statement I: [Ni(CN)_ 4 ]^ 2- is square planar and diamagnetic complex, with dsp^ 2 hybridization...
- Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographic plate?
- A primary aliphatic amine on reaction with nitrous acid in cold (273 K) and there after raising temperature of reaction mixture...
- Which one of the following is NOT a copolymer?Not in JEE Main or NEET syllabus
- Stability of -Helix structure of proteins depends upon
- A 2.0 g sample containing MnO_ 2 is treated with HCl liberating Cl_ 2 . The Cl_ 2 gas is passed into a solution of KI and 60.0 mL...
- The hybridization of P exhibited in PF_ 5 is sp_ x d_ y . The value of y is _____
- The vapour pressures of two volatile liquids A and B at 25°C are 50 Torr and 100 Torr, respectively. If the liquid mixture,...
- The solubility product of a sparingly soluble salt A_ 2 X_ 3 is 1.1 10^ -23 . If specific conductance of the solution is 3 10^ -5...
- The quantity of electricity of Faraday needed to reduce 1 mol of Cr_ 2 O_ 7 ^ 2- to Cr^ 3+ is _____
- For a first order reaction A B, the rate constant, k = 5.5 10^ -14 s^ -1 . The time required for 67% completion of reaction is x...
- Number of complexes which will exhibit synergic bonding amongst, [Cr(CO)_ 6 ], [Mn(CO)_ 5 ] and [Mn_ 2 (CO)_ 10 ] is _____.
- Consider the reaction 4HNO_ 3 ( ) + 3KCl(s) Cl_ 2 (g) + NOCl(g) + 2H_ 2 O(g) + 3KNO_ 3 (s) The amount of HNO_ 3 required to...
- Given below are the quantum numbers for 4 electrons. A. n = 3, = 2, m _ = 1, m_s = +1/2 B. n = 4, = 1, m _ = 0, m_s = +1/2 C. n =...
- C(s) + O_ 2 (g) CO_ 2 (g) + 400 kJ C(s) + 1 2 O_ 2 (g) CO(g) + 100 kJ When coal of purity 60% is allowed to burn in presence of...
- 200 mL of 0.01 M HCl is mixed with 400 mL of 0.01M H_ 2 SO_ 4 . The pH of the mixture is _____.