This paper is based on AISSCE curriculum ( chemistry ,,theory) and covers almost all topics. It contains numericals also that would be helpful for incoming board examination.

KENDRIYA VIDYALAYA SANGATHAN
PRE-BOARD EXAMINATION
XII-CHEMISTRY THEORY [043]


M. M.: 70​ ​ ​ ​ ​ Time: 3 Hours
Read the following instructions carefully-
(a) There are 33 questions in this question paper with internal choice.
(b) SECTION A consists of 16 multiple-choice questions carrying 1 mark
each.
(c) SECTION B consists of 5 short answer questions carrying 2 marks each.
(d) SECTION C consists of 7 short answer questions carrying 3 marks each.
(e) SECTION D consists of 2 case-based questions carrying 4 marks each.
(f) SECTION E consists of 3 long answer questions carrying 5 marks each.
(g) All questions are compulsory.
(h) Use of log tables and calculators is not allowed.
SECTION -A
The following questions are multiple -choice questions with one
correct answer. Each question carries 1 mark. There is no internal
choice in this section.
1.​ Name the linkage that holds the two units in the disaccharide?
(a)​ Nucleosidic linkage​ ​ (b) Glycosidic linkage
(c) Peptide linkage ​ ​ ​ (d) None of these
2.​ Which of the aqueous solutions should have the highest boiling
point?
(a)​ 1.0 M NaOH ​ ​ ​ ​ (b) 1.0 M Na2SO4
(c) 1.0 M NH4NO3 ​ ​ ​ ​ (d) 1.0M KNO3
3.​Which of the following is the weakest base?

, 4.​Which of the statements about electrolyte solutions is false?
(a) Conductivity of solution depends upon size of ions.
(b) Conductivity depends upon viscosity of solution.
(c) Conductivity does not depend upon solvation of ions present in
solution.
(d) Conductivity of solution increases with temperature.
5. A first order reaction is 50% completed in 1.26 x 1014 s. How much
time would it take for 100% completion?
(a) 1.26 x 1015 s​ ​ ​ ​ (b) 2.52 x 1014 s
(c) 2.52 x 1028 s​ ​ ​ ​ (d) Infinity
6. The CFSE for octahedral [CoCl6]4- is 18000 cm-1. The CFSE for
tetrahedral [CoCl4]2- will be
(a) 18,000 cm-1 ​ ​ ​ ​ (b) 16,000 cm-1
(c) 8,000 cm-1 ​ ​ ​ ​ (d) 20,000 cm-1
7.​The correct IUPAC name of [Pt(NH3)2Cl2] is
(a) Diamminedichloridoplatinum (II)​
(b) Diamminedichloridoplatinum (IV)
(c) Diamminedichloridoplatinum (0)
(d) Dichloridodiammineplatinum (IV)
8.​Invert sugar is the mixture of
(a) Glucose and fructose​ ​ ​ (b) Glucose and lactose
(c) Lactose and galactose​ ​ ​ (d) Glucose and galactose
9.​ Hoffmann bromamide degradation reaction can be shown by –
(a) ArNH2​ ​ ​ ​ ​ (b) ArCONH2
(c) ArNO2 ​ ​ ​ ​ ​ (d) ArCH2NH2