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XII Chemistry Sample Paper, Set-10
Instructions: 1. Section-A  Q. no. 1-8 carry 1 mark each.2. Section-B  Q. no. 9-18 carry 2 marks each.3. Section-C  Q. no. 19-27 carry 3 marks each.4. Section-D  Q. no. 28-30 carry 5 marks each. Section-A 1. What is the total number of atoms per unit cell in a face-centred cubic (fcc) structure? Ans. The total number of atoms per unit cell in a face-centred cubic (fcc) str...

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XII Chemistry Sample Paper, Set-9
Instructions: 1. Section-A  Q. no. 1-8 carry 1 mark each.2. Section-B  Q. no. 9-18 carry 2 marks each.3. Section-C  Q. no. 19-27 carry 3 marks each.4. Section-D  Q. no. 28-30 carry 5 marks each. Section-A 1. Define ‘rate of a reaction’. Ans. The rate of reaction is the change in the concentration of any one of the reactants or products per unit time. 2. Give o...

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XII Chemistry Sample Paper, Set-8
Instructions: 1. Section-A  Q. no. 1-8 carry 1 mark each.2. Section-B  Q. no. 9-18 carry 2 marks each.3. Section-C  Q. no. 19-27 carry 3 marks each.4. Section-D  Q. no. 28-30 carry 5 marks each. Section-A 1. Why some of the glass objects recovered from ancient buildings look milky instead of being transparent? Ans. It is because some crystallization takes place in transpar...

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XII Chemistry Sample Paper, Set-7
Instructions: 1. Section-A  Q. no. 1-8 carry 1 mark each.2. Section-B  Q. no. 9-18 carry 2 marks each.3. Section-C  Q. no. 19-27 carry 3 marks each.4. Section-D  Q. no. 28-30 carry 5 marks each. Section-A 1. Ammonia is a Lewis base. Why? Ans. Due to the presence of lone pairs on nitrogen atom of ammonia, it can donate electron pair and acts as a lewis base. 2. What is pri...

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XII Chemistry Sample Paper, Set-6
Instructions: 1. Section-A  Q. no. 1-8 carry 1 mark each.2. Section-B  Q. no. 9-18 carry 2 marks each.3. Section-C  Q. no. 19-27 carry 3 marks each.4. Section-D  Q. no. 28-30 carry 5 marks each. Section-A 1. What causes Brownian movement in a colloidal solution? Ans. The particles of a colloidal solution keep moving in a zigzag pattern. This happens because of unbalanced b...

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XII Chemistry Sample Paper, Set-5
Instructions: 1. Section-A  Q. no. 1-8 carry 1 mark each.2. Section-B  Q. no. 9-18 carry 2 marks each.3. Section-C  Q. no. 19-27 carry 3 marks each.4. Section-D  Q. no. 28-30 carry 5 marks each. Section-A 1. Enlist the factors affecting rate of a reaction. Ans. The factors affecting rate of a reaction are - a) Concentration of reactantsb) Temperaturec)  Catalyst 2....

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XII Chemistry Sample Paper, Set-4
Instructions: 1. Section-A  Q. no. 1-8 carry 1 mark each.2. Section-B  Q. no. 9-18 carry 2 marks each.3. Section-C  Q. no. 19-27 carry 3 marks each.4. Section-D  Q. no. 28-30 carry 5 marks each. Section-A 1. Name one ore of manganese and chromium. Ans. Pyrolusite (MnO2) and Chromite(FeCr2 O4) respectively. 2. When is the value of Van’t Hoff factor more than one...

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XII Chemistry Sample Paper, Set-3
Instructions: 1. Section-A  Q. no. 1-8 carry 1 mark each.2. Section-B  Q. no. 9-18 carry 2 marks each.3. Section-C  Q. no. 19-27 carry 3 marks each.4. Section-D  Q. no. 28-30 carry 5 marks each. Section-A 1. What happens when a freshly prepared Fe(OH)3 is shaken with a little amount of dilute solution of FeCl3. Ans. Peptization takes place forming a positively charged...

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XII Chemistry Sample Paper, Set-2
Instructions: 1. Section-A  Q. no. 1-8 carry 1 mark each.2. Section-B  Q. no. 9-18 carry 2 marks each.3. Section-C  Q. no. 19-27 carry 3 marks each.4. Section-D  Q. no. 28-30 carry 5 marks each. Section-A 1. Name the type of potential difference produced between the fixed charged layer and diffused layer having opposite charges around the colloidal particles. Ans. Zeta pot...

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XII Chemistry Sample Paper, Set-1
Instructions: 1. Section-A  Q. no. 1-8 carry 1 mark each.2. Section-B  Q. no. 9-18 carry 2 marks each.3. Section-C  Q. no. 19-27 carry 3 marks each.4. Section-D  Q. no. 28-30 carry 5 marks each. Section-A 1. Define the term ‘Tyndall effect’. Ans. Tyndall effect is observed when a fine beam of light enters a room through a small hole. It happens because of the s...

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