Practice questions
90156 published questions with worked solutions.
- The species having identical radii according to the Bohr's theory are: A. H (first orbit) B. He⁺ (first orbit) C. He⁺ (Second...
- At 27°C, 0.1 M, 1 L K₄[Fe(CN)₆] aqueous solution and 0.1 M, 1 L FeCl₃ aqueous solution are placed in a container separated by a...
- 20 mL of a solution of acetic acid required 28.4 mL of 0.1 M NaOH for its neutralization. A solution (X) was prepared by mixing...
- Match the LIST-I with LIST-II List-I (Reaction): A. Williamson Synthesis, B. Friedel Craft Reaction, C. Bromination of vinyl...
- The 1st ionization enthalpy for Mg is +737 kJ/mol. The most probable estimated value of the 2nd ionization enthalpy of Mg is...
- The electronegativity of a group 13 element 'E' is same as that of Ge (on Pauling scale and upto one decimal point). The CORRECT...
- Pairs of elements with the same number of electrons in their respective 4f orbital are [Atomic number: Eu-63, Gd-64, Dy-66,...
- Consider the metal complexes [Ni(en)₃]²⁺ (A), [NiCl₄]²⁻ (B) and [Ni(NH₃)₆]²⁺ (C). Choose the CORRECT option by considering the...
- Consider the following molecules/species: (x) tropone, (y) acetone, (z) acetate ion. The correct order of carbon–oxygen double...
- Consider |x| is the difference in oxidation states of Mn in highest manganese fluoride and highest manganese oxide. The ions with...
- The following two wedge–dash structures of a carbon bearing Br, Cl, Me and CH₃ are:
- The descending order of acidity among the following compounds is: A. Phenol, B. 4-nitrophenol, C. 4-methoxyphenol, D....
- The strongest conjugate acid will result from:
- A D-aldotetrose on oxidation with concentrated HNO₃ resulted in optically inactive dicarboxylic acid. The structure of the...
- Among Fe³⁺, Pb²⁺, Cu²⁺ and Mn²⁺, identify the one that gets precipitated out while passing H₂S in presence of NH₄OH as group...
- Match the LIST-I with LIST-II List-I (Compound): A. Cyclohexanol, B. Cyclohexylamine, C. Cyclohexanecarbaldehyde, D. Phenol...
- If 3.365 g of ethanol (l) is burnt completely in a bomb calorimeter at 298.15 K, the heat produced is 99.472 kJ. The |ΔH_f°| of...
- For the following reaction at 50°C and at 2 atm pressure, 2N₂O₅(g) ⇌ 2N₂O₄(g) + O₂(g), N₂O₅ is 50% dissociated. The magnitude of...
- An electrochemical cell, consist of the following two redox couples, Mˣ⁺(aq)/M(s) [E°red=+0.15 V] and Fe³⁺(aq)/Fe(s)...
- For a first order reaction A → B: | t/min | [A]/M | |---|---| | 0 | 0.6500 | | x | 0.0650 | | 20 | 0.00065 | x = _______ min....