Sample Paper Bihar Board Class XII Chemistry

(Set-1)

1.The oxidation state of Nickel in [Ni(CO)4] is :
((A) 1
(B) 3
(C) 0
(D) 2

2.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

3.Which of the following is not a condensation polymer :
((A) Glyptal
(B) Nylon – 6, 6
(C) Dacron
(D) PTFE

4.The reaction of Cl2 with hot NaOH gives
((A) NaCl, NaClO3
(B) NaCl
(C) NaCl, NaOCl
(D) NaClO3

5.The unit of rate constant of First order reaction is
((A) Time -1
(B) Mole liter -1 sec -1
(C) Liter mole -1 sec -1
(D) Liter mole -1 sec

Sample Paper Bihar Board Class XII Chemistry

(Set-2)

1.How many kind of space lattices are possible in a crystal.
((A) 23
(B) 7
(C) 230
(D) 14

2.Fog is an example of colloidal solution of.
((A) Liquid dispersed in gas
(B) Gas dispersed in gas
(C) Solid dispersed in gas
(D) Solid dispersed in liquid

3. Faradays laws of Electrolysis are related to
((A) Atomic No. of the cation
(B) Atomic no. of the cation
(C) Equivalent weight of electrolyte
(D) Speed of cation

4.A broad spectrum antibiotic is.
((A) Paracetamol
(B) Peniciline
(C) Aspirin
(D) Chloramphenicol

5.When excess of an electrolyte is added to a colloid it–
((A) Coagulates
(B) gets diluted
(C) Precipitates
(D) does not change

Sample Paper Bihar Board Class XII Chemistry

(Set-3)

1.If an electronic solution is diluted to 9 times then its conductance
((A) increases by 9 times
(B) decreases by 9 times
(C) remains constant
(D) None of these

2. The two electrodes of Pt fitted in a conductance cell are 1.5 cm apart while the cross - sectional area of each electrode is 0.75 cm2. What is cell constant ?
((A) 0.2 cm–1
(B) 0.5 cm–1
(C) 2.0 cm–1
(D) 1.125 cm–1

3. The rate of second order reaction is 3 × 10–5 mol L–1 5–1. What is the rate consant K, when the initial concentration
is 0.2 mol L–1 .
((A) 1.5 × 10–4
(B) 7.5 × 10–4
(C) 7.5 × 10–3
(D) 1.5 × 10–3

4. The amount of electricity required to deposite 1 mole of Al from a solution of AlCl3 will be
((A) 0.33 F
(B) F
(C) 3F
(D)1 Ampere

5. The no of chiral carbon in Lactice aid is.
((A) 4
(B) 5
(C) 1
(D) 3

6. Which can readily undergo dehydration.
((A) CH3OH
(B) C6H5OH
(C) (CH3)3COH
(D) CH3COOH

Sample Paper Bihar Board Class XII Chemistry

(Set-4)

1.Which one of the following is not an element of the second transition series.
((A) Molybodenum
(B) Silver
(C) Platinum
(D) Zirconium

2. 4 M + 8 CN– + 2H2O + O2 → 4 [M(CN)2 + 4OH– the metal M is
((A) Ag
(B) Fe
(C) Cu
(D) Zn

3. Glycerol is a–
((A) Primary alcohol
(B) Monohydric alcohol
(C) Secondary alcohol
(D) Trihydric alcohol

4.The number of structural isomers of C3H5Cl3 is.
((A) Two
(B) Three
(C) Four
(D) Five

5.Coordination number of sodium ion Na+ in NaCl is
((A) Four
(B) Three
(C) Six
(D) Five

6. Which one of the following metal ions is diamagnetic.
((A) Ca3+
(B) V3+
(C) Ti3+
(D) Sc3+

7. The ligand in potassium ferrocyanide is
((A) K+
(B) CN–
(C) Fe3+
(D) (CN)6

Sample Paper Bihar Board Class XII Chemistry

(Set-5)

1.The crystal System of a compound with unit cell dimension a = 0.352 nm, b = 0.352 nm, c = 0.498 nm
  α = β = 90º , and γ = 120º
((A) Cubic
(B) Hexagonal
(C) orthorhombic
(D) rhombohedral

2. The fresh precipitate can be transformed in colloidal solution by
((A) Coagulation
(B) Peptization
(C) Diffusion
(D) None of these

3. The drug used against AIDS is
((A) L. S. D.
(B) B. H. A.
(C) A. Z. T.
(D) Bithional

4. The number of P-O-P bonds in cyclic metaphosphonic acid is
((A) Zero
(B) Two
(C) Three
(D)Four

5.Smelting involves reduction of metal oxide with.
((A) C
(B) CO
(C) Mg
(D) Al