Q31. An element is placed in the second group and third period of the periodic table and
() Identify the element and write its electronic configuration.
in dark colour bottles?
in presence of Oxygen forms a basic oxide. (3)
(i) Write a balanced chemical equation when it burns in the presence of air.
(iii) Draw the electron dot structure for the formation of this oxide.
Q32. A metal 'X' combines with a non-metal Y' by the transfer of electrons to form a
compound Z.(3)
(i) State the type of bond in compound 'Z'.
(ii) What can you say about the melting point and boiling point of compound
Z? (iii) Will this compound be a good conductor of electricity?
Q33. An object of height 5 cm is held 30 cm away from a converging lens of focal length
10 cm. Find the position, size and nature of the image formed. 3
SECTION D
Answers
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1
Explanation:
(a) Magnesium
(b) 2, 8, 2
(c) 2Mg+O
2
→2MgO
(d) MgO+H
2
O→Mg(OH)
2
(e) Electron dot structure for the formation of magnesium oxide is shown in image:
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5
Answer:
An element is placed in 2nd Group and 3rd Period of the Periodic Table, burns in presence of oxygen to form a basic oxide. (a) Identify the element (b) ...
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(a) Magnesium (b) 2, 8, 2 (c) 2Mg + O2 → 2MgO (d) MgO + H2O → Mg(OH)2 (e) Electron dot structure for the formation of magnesium oxide
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