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Chemistry Class - XII  (CBSE)
You are on questions of Set II
(Only those questions are given, which are different from Set I)

Q.1 Write the number of unpaired electron(s) in an atom of an element with the atomic number 21. 9. (1 mark)


Q.3 How many atoms are there in a unit cell of a metal crystallising in fcc structure?


Q.9 In the formula Fe(⁵ - (C₅H₅)₂ what does the prefix '⁵' denote.
 (Mark 1)

Q 12 (i) Draw the structure of anion (Si₆O₁₈)^12-.
(ii) How many oxygen atom of the basic building unit are shared with other units in this structure? (2 marks)


Q.21 For the first row of transition metals the E^o values are : (2 marks)

Give suitable explanation for the irregular trend in these values.
 (Mark 1)

Q. 24 Write the state of hybridisation and the oxidation state of the central atom in each of the following species : (2 marks)
(i) cis-[Co(NH₃)₄Cl₂]⁺
(ii) [Ni(CO)₄]


Q. 32 Write an ionic equation for the conversion of :
(a) Magnate to permanganate.
(b) Permanganate to manganese.
(c) Chromate to dichromate. (3 marks)


Q.33 Present a comparative account for the following : (5 marks)
(i) Oxidation state of tin and lead.
(ii) Structure of pentaoxides of nitrogen and phosphorus
(iii) Maximum number of covalency exhibited by boron and aluminium.
(iv) Bond angles of H₂O and H₂S. (5 marks)

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