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Question

To a solution containing 0.001 M of Ni2+ and 0.1 M of Cd2+, the metal rods Ni and Cd are inserted respectively (at 298 K) and connected by a conducting wire. This resulted in a dissolution of Cd. The emf of the cell will be

[Given : R = 8.314 JK–1 mol–1, F = 96500 C mol–1, EoNi2+/Ni=0.24V and EoCd2+/Cd=0.40V]

0.001 M Ni2+ तथा 0.1 M Cd2+ युक्त विलयन में धातु छड़ क्रमशः Ni तथा Cd (298 K पर) को डुबोया जाता है तथा इन्‍हें एक चालक तार द्वारा संयोजित किया जाता है। इसके परिणामस्वरूप Cd घुलता है। सेल का वि.वा.ब. होगा

[दिया गया है : R = 8.314 JK–1 mol–1, F = 96500 C mol–1, EoNi2+/Ni=0.24V तथा EoCd2+/Cd=0.40V]

A
–0.22 V
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B
–0.1 V
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C
0.1 V
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D
0.22 V
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Solution

The correct option is C 0.1 V
Solution

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Q. Two different elements ‘A’ and ‘B’ were taken in powdered form and burned in the presence of sufficient amount of air to form ‘C’ and ‘D’ respectively. Aqueous solutions of both ‘C’ and ‘D’ were prepared and tested with litmus paper. If aqueous solution of ‘C’ turned blue litmus paper red and aqueous solution of ‘D’ turned red litmus paper blue, then identify the correct statement(s) about A, B, C and D and choose the correct option.
(a) The aqueous solutions of ‘C’ and ‘D’ are basic and acidic respectively
(b) The aqueous solutions of ‘C’ and ‘D’ are acidic and basic respectively
(c) ‘A’ is a metal and ‘B’ is a non-metal
(d) ‘A’ is a non-metal and ‘B’ is a metal

दो विभिन्न तत्वों ‘A’ तथा ‘B’ को चूर्णित रूप में लिया गया तथा इन्हें वायु की पर्याप्त मात्रा की उपस्थिति में दहन करने पर क्रमशः ‘C’ तथा ‘D’ प्राप्त होते हैं। ‘C’ तथा ‘D’ दोनों के जलीय विलयन बनाये गये तथा इनका परीक्षण लिटमस पेपर द्वारा किया गया। यदि ‘C’ का जलीय विलयन नीले लिटमस पेपर को लाल कर देता है तथा ‘D’ का जलीय विलयन लाल लिटमस पेपर को नीला कर देता है, तो A, B, C तथा D के संदर्भ में सही कथन/कथनों की पहचान कीजिए तथा सही विकल्प का चयन कीजिए।
(a) ‘C’ तथा ‘D’ के जलीय विलयन क्रमशः क्षारीय तथा अम्लीय हैं
(b) ‘C’ तथा ‘D’ के जलीय विलयन क्रमशः अम्लीय तथा क्षारीय हैं
(c) ‘A’ एक धातु है तथा ‘B’ एक अ-धातु है
(d) ‘A’ एक अ-धातु है तथा ‘B’ एक धातु है
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