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After the tremendous success of our last year Important Questions Bank HSC (12th Std) Board Exam 2016, we have also created a list of Most Important Questions Bank for CBSE Class XII (HSC) Board Exam 2017 which are likely to appear in HSC Board Exams this year.
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CHEMISTRY- IMPORTANT QUESTION BANK
Q1. Out of BaCl2 and KCl, which one is more effective in causing coagulation of a negatively charged colloidal Sol ? Give reason.
Q2. What is the formula of a compound in which the element Y forms ccp lattice and atoms of X occupy 1/3rd of tetrahedral voids?
Q3. Define azeotropes. What type of azeotrope is formed by positive deviation from Raoult’s law? Give an example.
Q4.What are the transition elements? Write two characteristics of the transition elements.
Q5. Give reasons for the following observations:
a. Leather gets hardened after tanning.
b. Lyophilic sol is more stable than the lyophobic sol.
c. It is necessary to remove CO when ammonia is prepared by Haber’s process.
Q6.Write the names and structures of the monomers of the following polymers:
a. Nylon-6, 6
Q7. How do you convert the following:
a. Phenol to anisole
b. Propan-2-ol to 2-methylpropan-2-ol
c. Aniline to phenol
Q8. a. Which one of the following is a disaccharide: Starch, Maltose, Fructose, Glucose?
b. What is the difference between fibrous protein and globular protein?
c. Write the name of vitamin whose deficiency causes bone deformities in children.
Q9. 3.9 g of benzoic acid dissolved in 49 g of benzene shows a depression in freezing point of 1.62 K. Calculate the van Hoff factor and predict the nature of solute (associated or dissociated).
(Given: Molar mass of benzoic acid = 122 g mol–1, Kf for benzene = 4.9 K kg mol–1)
Q10.Answer the Following question:
a. Indicate the principle behind the method used for the refining of zinc.
b. What is the role of silica in the extraction of copper?
c. Which form of the iron is the purest form of commercial iron?
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