Chemistry questions
29404 published questions with worked solutions.
- The electrolytes usually used in the electroplating of gold and silver, respectively are:
- Among the following reactions of hydrogen with halogens, the one that requires a catalyst is:Not in JEE Main or NEET syllabus
- A compound of formula A_2B_3 has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is...Not in JEE Main or NEET syllabus
- Sodium metal on dissolution in liquid ammonia gives a deep blue solution due to the formation of:Not in JEE Main or NEET syllabus
- Which of the following tests cannot be used for identifying amino acids?
- The difference in the number of unpaired electrons of a metal ion in its high spin and low-spin octahedral complexes is two. The...
- The ground state energy of hydrogen atom is −13.6 eV. The energy of second excited state of He^+ ion in eV is:
- The 71st electron of an element X with an atomic number of 71 enters into the orbital:
- In the cell Pt(s)|H_2(g, 1 bar)|HCl(aq)|AgCl(s)|Ag(s)|Pt(s) the cell potential is 0.92 V when a 10^ -6 molal HCl solution is...
- Which is the most suitable reagent for the following transformation? CH_3–CH=CH–CH_2–CH(OH)–CH_3 → CH_3–CH=CH–CH_2CO_2H
- The process with negative entropy change is:
- Elevation in the boiling point for 1 molar solution of glucose is 2 K. The depression in the freezing point for 2 molal solution...
- The amount of sugar (C_ 12 H_ 22 O_ 11 ) required to prepare 2 L of its 0.1 M aqueous solution is:
- The number of 2-centre-2-electron and 3-centre-2-electron bonds in B_2H_6, respectively, are:
- Haemoglobin and gold sol are examples of:Not in JEE Main or NEET syllabus
- 5.1 g NH_4SH is introduced in 3.0 L evacuated flask at 327ºC. 30% of the solid NH_4SH decomposed to NH_3 and H_2S as gases. The...
- The type of hybridisation and number of lone pair(s) of electrons of Xe in XeOF_4, respectively, are:
- Which of the following is not an example of heterogenous catalytic reaction?Not in JEE Main or NEET syllabus
- The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are:Not in JEE Main or NEET syllabus
- A process has ΔH = 200 J mol^ -1 and ΔS = 40 JK^ -1 mol^ -1 . Out of the values given below, choose the minimum temperature above...