Chemistry questions
29404 published questions with worked solutions.
- In metallurgy the term "gangue" is used for :Not in JEE Main or NEET syllabus
- Number of lone pairs of electron in the central atom of SCl_ 2 , O_ 3 , ClF_ 3 and SF_ 6 , respectively, are ;
- In following pairs, the one in which both transition metal ions are colourless is :
- In neutral of faintly alkaline medium, KMnO_ 4 being a powerful oxidant can oxidize, thiosulphate almost quantitatively, to...
- Which of the following compound is an example of hyponotic drug ?Not in JEE Main or NEET syllabus
- Resistance of a conductivity cell (cell constant 129 m^ -1 ) filled with 74.5 ppm solution of KCl is 100 (labelled as solution...
- Ionic radii of cation A^ + and anion B^ - are 102 and 181 pm respectively. These ions are allowed to crystallize into an ionic...Not in JEE Main or NEET syllabus
- The minimum uncertainty in the speed of an electron in an one dimensional region of length 2a_ 0 (Where a_ 0 = Bohr radius 52.9...
- When 600 mL of 0.2 M HNO_ 3 is mixed with 400 mL of 0.1M NaOH solution in a flask, the rise in temperature of the flask is _____...
- If O_ 2 gas is bubbled through water at 303 K, the number of millimoles of O_ 2 gas that dissolve in 1 litre of water is _____....
- If the solubility product of PbS is 8 10^ -28 , then the solubility of PbS in pure water at 298 K is x 10^ -16 mol L^ -1 . The...
- In a linear tetrapeptide, (Constituted with different amino acids), (number of amino acids) − (number of peptide bonds) is _____.
- In bromination of Propyne, with Bromine 1, 1, 2, 2-tetrabromopropane is obtained in 27% yield. The amount of 1, 1, 2, 2...
- Consider the species CH_ 4 , NH_ 4 ^ + and BH_ 4 ^ - . Choose the correct option with respect to these species.
- 4.0 moles of argon and 5.0 moles of PCl_ 5 are introduced into an evacuated flask of 100 litre capacity at 610 K. The system is...
- Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The first...
- Given below are two statements. Statement-I: In CuSO_ 4 5H_ 2 O, Cu-O bonds are present. Statement-II: In CuSO_ 4 5H_ 2 O,...
- Number of lone pair(s) of electrons on central atom and the shape of BrF_ 3 molecule respectively, are
- Sulphur dioxide is one of the components of polluted air. SO_ 2 is also a major contributor to acid rain. The correct and...Not in JEE Main or NEET syllabus
- In Friedel-Crafts alkylation of aniline, one gets