Chemistry Class 12
1
HIGHER SECONDARY MODEL EXAMINATION
HSE II
Max.marks: 60
CHEMISTRY
Time: 2.45 hrs
General instructions
All questions are compulsory
Cool-off time is 15 minutes
1] Defects modify the properties of crystals [4 marks]
A] Give differences between Schottky and Frenkel defects
[2.0]
B] On heating zinc oxide becomes yellow in colour. Why? [1.0 ]
C] Alkali metal halides on heating in presence of alkali metal produce characteristic colours.Give reason [1.0]
2] Colligative properties depend on the number of solute particles in solution [4 marks]
A] Give the name of colligative property suitable for the measurement of molar mass of starch[1.0] B] Give reasons for abnormal colligative properties [1.0]
C] Represent elevation in boiling point graphically [ 2.0]
3] Cells are used for different purposes [4 marks]
A] Differentiate between primary and secondary cells [ 1.0]
B] The voltage given by mercury cell is contant . Why ? [1.0]
C] What are fuel cells ? Give their two advantages . [2.0]
4] Chemical kinetics deals with rates of chemical reactions [4 marks]
A] Give two differences between order and molecularity of a chemical reaction [1.0]
B] Draw a graphical representation to show the effect of a positive catalyst on the activation energy[1.0] C] How rate of reaction increases with increase in temperature ? [1.0]
D] What is the half life of a first order reaction whose rate constant is 200 s−1? [1.0]
5]Colloids are heterogeneous systems [3 marks]
2
A] Differentiate between Tyndall effect and Brownian movement [2.0]
B] State Hardy-Schulze rule for the coagulation of colloids [1.0]
6]Metallurgy deals with the extraction of a metal from a suitable ore[3 marks]
A] Which method of purification is represented by the given equation? [1.0]
B] Differentiate between roasting and calcination [1.0]
C] “All ores are minerals but all minerals are not ores” .Justify the statement [1.0]
7] Elements belonging from group 13 to
HIGHER SECONDARY MODEL EXAMINATION
HSE II
Max.marks: 60
CHEMISTRY
Time: 2.45 hrs
General instructions
All questions are compulsory
Cool-off time is 15 minutes
1] Defects modify the properties of crystals [4 marks]
A] Give differences between Schottky and Frenkel defects
[2.0]
B] On heating zinc oxide becomes yellow in colour. Why? [1.0 ]
C] Alkali metal halides on heating in presence of alkali metal produce characteristic colours.Give reason [1.0]
2] Colligative properties depend on the number of solute particles in solution [4 marks]
A] Give the name of colligative property suitable for the measurement of molar mass of starch[1.0] B] Give reasons for abnormal colligative properties [1.0]
C] Represent elevation in boiling point graphically [ 2.0]
3] Cells are used for different purposes [4 marks]
A] Differentiate between primary and secondary cells [ 1.0]
B] The voltage given by mercury cell is contant . Why ? [1.0]
C] What are fuel cells ? Give their two advantages . [2.0]
4] Chemical kinetics deals with rates of chemical reactions [4 marks]
A] Give two differences between order and molecularity of a chemical reaction [1.0]
B] Draw a graphical representation to show the effect of a positive catalyst on the activation energy[1.0] C] How rate of reaction increases with increase in temperature ? [1.0]
D] What is the half life of a first order reaction whose rate constant is 200 s−1? [1.0]
5]Colloids are heterogeneous systems [3 marks]
2
A] Differentiate between Tyndall effect and Brownian movement [2.0]
B] State Hardy-Schulze rule for the coagulation of colloids [1.0]
6]Metallurgy deals with the extraction of a metal from a suitable ore[3 marks]
A] Which method of purification is represented by the given equation? [1.0]
B] Differentiate between roasting and calcination [1.0]
C] “All ores are minerals but all minerals are not ores” .Justify the statement [1.0]
7] Elements belonging from group 13 to