ANSWER KEY

II PUC MATH TEST RESULT (35)

1201         [25]

1202         [29]

1203         [26]

1204         [29]

1205         [22]

1206         [24]

1207         [20]

1208         [AB]

1209         [28]

1210         [21]

ELECTROLYSIS TEST 28/03/10 BATCH I     X ICSE

Answers

1.Refer text book

2. B

3. Refer text book

4.i) electrolyte  ii) nickel   iii) dilute sulphuric acid   iv) cathode  v) anode  vi) cations

5. S.E.- dil. HCl, dil.H₂SO₄     W.E. - carbonic acid , NH₄OH    N.E. - carbon tetrachloride 

6. i) Na[Ag(CN)₂ ↔    Na⁺     +   Ag+         +    CN^-₂

ii) H₂O ↔        H⁺    +  OH^-

iii) Ag+        +   1e ^- →    Ag   [Ag deposited on article]

iv) Ag       -    1e ^-   → Ag+      [ product Nil – Ag+ ions]   

7.  . Refer text book

8.  Refer text book

9. . Refer text book

CHEMICAL BONDING & MOLE CONCEPTS  X ICSE BATCH II (28/3/10)

ANSWERS

1. i) MgSO₄

ii) non-metal

iii) because the no.of electrons in the outer most shell of each element of a group is same.

iv) Cation and anion

2. i)0.05 mole     ii) 0.05 x6.023 x10²³  molecules    iii) 1.12 l volume

3.HCl   & NH3

4. Refer text book

5. Refer text book

6. Refer text book

7. Refer text book

8. one

9.i) 2,8,6

ii) 2

iii) covalent bond

iv) ionic bond

v) CaY

10. 2.5

11. 2

12. . Refer text book