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CBSE Class 12 Chemistry Question Paper 2017: All India

Jul 27, 2017 09:00 IST

    Download CBSE Class 12 Chemistry Question Paper 2017: All India

    CBSE Class 12 Chemistry board exam 2017 question paper (All India, Set 1) is available here for download in PDF format. With this article, you can download the complete question with the help of download link available at the end of this article. This paper was held on 25th March 2017.

    General instruction for the paper

    (i) All questions are compulsory.

    (ii) Questions number 1 to 5 are very short answer questions and carry 1 mark each.

    (iii) Questions number 6 to 10 are short answer questions and carry 2 marks each.

    (iv) Questions number 11 to 22 are also short answer questions and carry 3 marks each.

    (v) Question number 23 is a value based question and carries 4 marks.

    (vi) Questions number 24 to 26 are long answer questions and carry 5 marks each.

    (vii) Use log tables, if necessary. Use of calculators is not allowed.

    CBSE Board Exam 2017: Class 12 Chemistry Paper Analysis and Review

    CBSE Class 12 Chemistry Question Paper 2017: Delhi

    Some randomly selected questions from the question paper are given below:

    Question: Write the formula of the compound of phosphorus which is obtained when conc. HNO3 oxidises P4.

    Question: What is the effect of adding a catalyst on

    (a) Activation energy (Ea), and

    (b) Gibbs energy (ΔG) of a reaction?

    Question: What is the effect of adding a catalyst on

    (a) Activation energy (Ea), and

    (b) Gibbs energy (ΔG) of a reaction?

    Question: What type of colloid is formed when a liquid is dispersed in a solid? Give an example.

    Question: Write the structures of the products when Butan-2-ol reacts with the following:

    (a) CrO3

    (b) SOCl2

    Question: Calculate the number of unit cells in 8·1 g of aluminium if it crystallizes in a face-centred cubic (f.c.c.) structure. (Atomic mass of Al = 27 g mol‒1)

    Question:

    Write the name of the cell which is generally used in hearing aids. Write the reactions taking place at the anode and the cathode of this cell.

    Question:

    Using IUPAC norms write the formulae for the following:

    (a) Sodium dicyanidoaurate (I)

    (b) Tetraamminechloridonitrito-N-platinum (IV) sulphate

    Question:

    (a) Based on the nature of intermolecular forces, classify the following solids:

    Silicon carbide, Argon

    (b) ZnO turns yellow on heating. Why?

    (c) What is meant by groups 12-16 compounds? Give an example.

    Question:

    (a) The cell in which the following reaction occurs:

    2 Fe3+ (aq) + 2 I (aq) → 2 Fe2+ (aq) + I2 (s)

    has Ecello = 0·236 V at 298 K. Calculate the standard Gibbs energy of the cell reaction. (Given : 1 F = 96,500 C mol‒1)

    (b) How many electrons flow through a metallic wire if a current of 0·5 A is passed for 2 hours? (Given: 1 F = 96,500 C mol‒1)

    Question:

     (a) What type of isomerism is shown by the complex [Co (NH3)5 (SCN)]2+?

    (b) Why is [NiCl4]2 paramagnetic while [Ni (CN)4]2‒ is diamagnetic? (Atomic number of Ni = 28)

    (c) Why are low spin tetrahedral complexes rarely observed?

    Question:

    Write one difference in each of the following :

    (a) Multimolecular colloid and Associated colloid

    (b) Coagulation and Peptization

    (c) Homogeneous catalysis and Heterogeneous catalysis

    Question:

    (a) Write the dispersed phase and dispersion medium of milk.

    (b) Write one similarity between physisorption and chemisorption.

    (c) Write the chemical method by which Fe(OH)3 sol is prepared from FeCl3.

    Question:

    A first order reaction takes 20 minutes for 25% decomposition. Calculate the time when 75% of the reaction will be completed. (Given : log 2 = 0·3010, log 3 = 0·4771, log 4 = 0·6021)

    The following compounds are given to you :

    2-Bromopentane, 2-Bromo-2-methylbutane, 1-Bromopentane

    Question:

    (a) Write the compound which is most reactive towards SN2 reaction.

    (b) Write the compound which is optically active.

    (c) Write the compound which is most reactive towards β-elimination reaction.

    Question:

    Write the principle of the following:

    (a) Zone refining

    (b) Froth floatation process

    (c) Chromatography

    Download CBSE Class 12 Chemistry Question Paper 2017 (All India) in PDF format

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