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Class-12th (Chemistry) Olympiad | CANCHO

Class-12th (Chemistry) Olympiad - CANCHO

Mock Instructions

  • 1. This is Model Question Paper.
  • 2. This is an Online Worksheet.
  • 3. Total Questions-50.
  • 4. Total Time-60 minutes.

Q.1- Which of the following conditions favours the existence of a substance in the solid state?

(a) High temperature

(b) Low temperature

(c) High thermal energy

(d) Weak cohesive forces

Q.2- Which of the following is not a characteristic of a crystalline solid?

(a) Definite and characteristic heat of fusion.

(b) Isotropic nature.

(c) A regular periodically repeated pattern of arrangement of constituent particles in the entire crystal.

(d) A true solid

Q.3- Which of the following units is useful in relating concentration of solution with its vapour pressure?

(a) mole fraction

(b) parts per million

(c) mass percentage

(d) molality

Q.4- On dissolving sugar in water at room temperature solution feels cool to touch. Under which of the following cases dissolution of sugar will be most rapid?

(a) Sugar crystals in cold water.

(b) Sugar crystals in hot water.

(c) Powdered sugar in cold water.

(d) Powdered sugar in hot water.

Q.5- Considering the formation, breaking and strength of hydrogen bond, predict which of the following mixtures will show a positive deviation from Raoult’s law?

(a) Methanol and acetone.

(b) Chloroform and acetone.

(c) Nitric acid and water.

(d) Phenol and aniline.

Q.6- Which of the following process does not occur at the interface of phases?

(a) crystallization

(b) heterogenous catalysis

(c) homogeneous catalysis

(d) corrosion

Q.7-  Which of the following interface cannot be obtained?

(a) liquid-liquid

(b) solid-liquid

(c) liquid-gas

(d) gas-gas

Q.8-  A number of elements are available in earth’s crust but most abundant elements are _______________.

(a) Al and Fe

(b) Al and Cu

(c) Fe and Cu

(d) Cu and Ag

Q.9- In the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu2O with

(a) FeS

(b) CO

(c) Cu2S

(d) SO2

Q.10- Electrolytic refining is used to purify which of the following metals?

(a) Cu and Zn

(b) Ge and Si

(c) Zr and Ti

(d) Zn and Hg

Q.11-   Glycogen is a branched chain polymer of a-D-glucose units in which chain is formed by Cl-C4 glycosidic linkage whereas branching occurs by the formation of C1-C6 glycosidic linkage. Structure of glycogen is similar to _________.

(a) Amylose

(b) Amylopectin

(c) Cellulose

(d) Glucose

Q.12- Which of the following polymer is stored in the liver of animals?

(a) Amylose

(b) Cellulose

(c) Amylopectin

(d) Glycogen

Q.13-  Sucrose (cane sugar) is a disaccharide. One molecule of sucrose on hydrolysis gives _________.

(a) 2 molecules of glucose

(b) 2 molecules of glucose + 1 molecule of fructose

(c) 1 molecule of glucose + 1 molecule of fructose

(d) 2 molecules of fructose

Q.14- Which of the following polymers of glucose is stored by animals?

 

(a) Cellulose

(b) Amylose

(c) Amylopectin

(d) Glycogen

Q.15- Which of the statements about solutions of electrolytes is not correct?

(a) Conductivity of solution depends upon size of ions.

(b) Conductivity depends upon viscosiy of solution.

(c) Conductivity does not depend upon solvation of ions present in solution.

(d) Conductivity of solution increases with temperature.