Chemistry Model Question Paper www.biharboard.bih.nic.in : Plus Two 12th Std +2

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Document Described : Chemistry Question Paper, Bihar Question Paper

MODEL PAPER
Class XII
CHEMISTRY

I. In following Questions Q. No.–1 to 10 there are only one correct answer. You have to choose that correct answer.
1. The oxidation state of Nickel in [Ni(CO)4] is:)
(a) 1 (b) 3 (c) 0 (d) 2
3.If dispersed phase is liquid and dispersion medium is solid, the colloid is known as :-
(a) (A Sol) (b) (A gel) (c) (An emulsion) (d) (A foam)

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4.(Which of the following is not a condensation polymer:)
(A) (Glyptal ) (B) (Nylon – 6, 6)
(C) (Dacron ) (D) PTFE
5. (The reaction of Cl2 with hot NaOH gives)
(A) NaCl, NaClO3 (B) NaCl (C) NaCl, NaOCl (D) NaClO3
6. The unit of rate constant of First order reaction is
(A) (Time -1) (B) (Mole litre -1 sec -1)
(C) (Litre mole -1 sec -1) (D) (Litre mole -1 sec )
7. (The antiseptic action of CHI3 is due to )
(A) (Iodoform)
(B) (Liberation of free iodine)
(C) (Partially due to iodine and partially due to CHI3 itself)
(D) (None of these)
8. (Which of the following chemicals are used as anaesthetic)
(A) CCl4 (B) (C) CHCl3 (D)
9.Titanium shows magnetic moment of 1.73 B.M in its compound. What is the oxidation number of Ti in the compound.)
(A) +1 (B) +4 (C) +3 (D) +2
10. (Methylamine can be prepared by:)
(A) (Wurtz reaction ) (B) (Friedel- craft’s reaction)
(C) (Hofmann’s bromamide reaction)
(D) (Clemmension reaction)

II. In each question from Q. No. 11 to 15 two statements (Statement I and Statement II) are given choice the correct option for each question out of options (a), (b), (c) and (d) on the basis of given
statements. 5 × 1 = 5
(a) If both the statements are true and statement Ii is the correct explanation of statement I.
(b) If both the statements are true and statement II is not the correct explanation of statement I.
(c) (If statement I is true and statemejnt Ii is talse.)
(d) (If statement I is false and statement II is true.)
11. (Bauxite is an ore of aluminium.)
( The formula of bauxite is Al2O3)
12.(Chloroform does not give white ppt. of AgCl with AgNO3)
(Statement)&II: CHCl3 (CHCl3 does not contains free chlorine.)
13. (Statement)&I: (All ores are minerals.)
(Statement)&II: (All minerals are ore.)
14 (Statement)&I: (Depression in freezing-point is a colligative property) (Elevation in boiling point is a colligative property.)
15. (Statement)&I: (Iron get corroded readily in moist air.)
(Statement)&II: (Free energy of the process is positive.)

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