CSS 2013 Chemistry — MCQs

When Zn metal is kept in CuSO 4 solution, copper is precipitated and ZnSO 4 is formed because:

• AB 5 Which is not true about thermodynamics? A
• B6 The hydrogen molecule may be represented by two wave functions, Ψ covalent and Ψ ionic and
• C1 and C 2 are coefficient indicating the weight of each function. The real wave function may be written as (N is the normalization constant) A B 7 What happens when Al dissolves in aqueous NaOH? A B 8 The most important ore of aluminium is: A B 9 The salt bridge in the electrochemical cell serves to: A B 10 A spontaneous reaction is not possible if: A B 11 VBT is unable to explain the nature of some of the complexes of: A B 12 The zero point energy of a particle is 1-D box of dimension 6A 0 is: A B 13 The electrical conductivity of an electrolyte depends upon: A B 14 Brass is an alloy of: 3 x Also in: CSS · 2010 · Chemistry CSS · 2009 · Chemistry A B 15 According to Debye-Huckel theory of strong electrolytes, an ion moving in an atmosphere of oppositely charged ions experiences a drag. This effect is known as the: A B 16 Passage of electric current through the metals is due to: A B 17 Copper metal will replace silver ions in solution, resulting in the production of silver metal and copper ions. This indicates that: A B 18 The inexpensive and commonly used variety of glass is called soda glass. It is called so because: A B 19 When solid CoCl 2 is dissolved in water, a pink solution results and the following equilibrium is established: Co(H 2 O) 6 2+ (aq) + 4 Cl - (aq) <=> CoCl 4 2- (aq) + 6 H 2 O (l) Which one of the following best describes what will happen when a concentrated HCl is added to the CoCl 2 solution without changing the volume significantly? A B 20 Energy available to do work at constant _______ is known as Gibb's free energy. A B