Chemistry questions
29404 published questions with worked solutions.
- The highest industrial consumption of molecular hydrogen is to produce compounds of element:
- Which of the following statements are correct? (A) Both LiCl and MgCl_ 2 are soluble in ethanol. (B) The oxides Li_ 2 O and MgO...Not in JEE Main or NEET syllabus
- Identify the correct statement for B_ 2 H_ 6 from those given below: (A) In B_ 2 H_ 6 , all B-H bonds are equivalent. (B) In B_ 2...
- The most stable trihalide of nitrogen is:
- Two statements are given below: Statement I: The melting point of monocarboxylic acid with even number of carbon atoms is higher...
- Which of the following is an example of polyester ?Not in JEE Main or NEET syllabus
- A polysaccharide 'X' on boiling with dil. H_ 2 SO_ 4 at 393 K under 2-3 atm pressure yields 'Y'. 'Y' on treatment with bromine...
- During the qualitative analysis of salt with cation y^ 2+ , addition of a reagent (X) to alkaline solution of the salt gives a...
- Atoms of element X form hcp lattice and those of element Y occupy 2/3 of its tetrahedral voids. The percentage of element X in...Not in JEE Main or NEET syllabus
- 2O_ 3 (g) 3O_ 2 (g). At 300 K, ozone is fifty percent dissociated. The standard free energy change at this temperature and 1 atm...
- The osmotic pressure of blood is 7.47 bar at 300 K. To inject glucose to a patient intravenously, it has to be isotonic with...
- The cell potential for the following cell Pt | H_ 2 (g) | H^ + (aq) || Cu^ 2+ (0.01 M) | Cu(s) is 0.576 V at 298 K. The pH of the...
- The difference in oxidation state of chromium in chromate and dichromate salts is _____.
- In the cobalt-carbonyl complex: [Co_ 2 (CO)_ 8 ], number of Co-Co bonds is "X" and terminal CO ligands is "Y". X + Y = _____.
- The energy of one mole of photons of radiation of wavelength 300 nm is (Given h = 6.63 10^ -34 Js, N_A = 6.02 10^ 23 mol^ -1 , c...
- The correct order of bond orders of C_ 2 ^ 2- , N_ 2 ^ 2- , O_ 2 ^ 2- is respectively
- At 25°C and 1 atm pressure, the enthalpies of combustion are as given below : | Substance | H_ 2 | C(graphite) | C_ 2 H_ 6 (g) |...
- For a first order reaction, the time required for completion of 90% reaction is 'x' times the half life of the reaction. The...
- Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be
- Which of the following chemical reactions represents Hall-Heroult Process?Not in JEE Main or NEET syllabus