Ejaz H. Abbasi

GROUP IIIA & GROUP IVA ELEMENTS FILL IN THE BLANKS Q.01: Fill in the blanks: (i) ________ acid has the chemical formula HBO2. (Metaboric acid) (ii) Aluminium normally occurs as_________ minerals found in the rocks of outer portion of the…

s-BLOCK ELEMENTS FILL IN THE BLANKS Q.01: Fill in the blanks: (i) Alkali metals are _______ reactive than alkaline-earth metals. (more) (ii) Alkali metals decompose water vigorously producing ________ and hydrogen. (metal hydroxide) (iii) When heated in a current of…

PERIODIC CLASSIFICATION OF ELEMENTS AND PERIODICITY FILL IN THE BLANKS Q.01: Fill in the blanks: (i) Mendeleev in his periodic table, arranged the elements according to their atomic ___. (mass) (ii) Vertical columns in modern periodic table are called _________…

REACTION KINETICS Q.01: Multiple choice questions. (i) In zero order reaction, the rate is independent of: (a) Temperature of reaction (b) Concentration of reactants (c) Concentration of products (d) None of these ANSWER: (b) Concentration of reactants EXPALNATION: The rate…

ELECTROCHEMISTRY Q.01: Multiple choice questions. For each question there are four possible answers a, b, c and d. Choose the one you consider correct. (i) The cathode reaction in the electrolysis of dil. H2SO4 with Pt electrodes is:       (a) Reduction…

SOLUTIONS Q.01: Choose the correct answer for the given ones. (i) Molarity of pure water is:          (a) 1 (b) 18 (c) 55.5 (d) 6 ANSWER: (c) 55.5 EXPLANATION: Molarity means number of moles of solute present in liter solution. In…

CHEMICAL EQUILIBRIUM Q.01: Choose the correct answer: (i) For which system does the equilibrium constant, Kc, has units of (conc.)-1? (a) N2 + 3H2 ⇌ 2NH3 (b) H2 + I2 ⇌ 2HI   (c) 2NO2 ⇌ N2O4 (d) 2HF ⇌ H2…

THERMOCHEMISTRY Q.01: Choose the correct answer: (i) If an endothermic reaction is allowed to take place very rapidly in the air, the temperature of the surrounding air:                     (a) Remains constant (b) Increases (c) Decreases (d) Remains unchanged ANSWER: (c)Decreases…

CHEMICAL BONDING Q.01: Select the most suitable answer for the given one. 1) An ionic compound A+B– is most likely to be formed when: (a) The ionization energy of A is high and electron affinity of B is low. (b)…