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CBSE Class 12 Pre Board 2020 : Chemistry - Prelim 2 (Delhi Public School (DPS), Jammu)

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DELHI PUBLIC SCHOOL, JAMMU Pre-Board II Assignment Session (2019-20) Class: 12th Subject: Chemistry General Instructions: (i) All questions are compulsory. (ii) Section-A: Questions 1 to 20 arevery short answer questions (objective type) and carryone mark each. (iii)Section-B: Questions 21 to 27 are short answer questions and carry two marks each. (iv)Section-C: Questions 28 to 34 carry three marks each. (v)Section-D: Questions 35 to37 are long answer questions and carry five marks each. (vi) Use log tables is necessary. Use of calculators is not allowed. SECTION-A Questions 1 to 5 are passage questions: Read the given passage and answer the questions (a) to (e) that follows: All the noble gases have a stable configuration of ns2np6 except Helium which has 1s2 configuration. Thus, these elements have no tendency either to lose, gain or share electrons with the atoms of other elements, i.e. their combining capacity or valency is zero. Thus they have a very high ionisation enthalpy and large positive value of electron gain enthalpy. Q1. Q2. Q3. Q4. Q5. Why do noble gases have very low boiling points? Why do noble gases have comparatively large atomic sizas? Why are the elements of group 18 known as noble gases? Which noble gas is used in filling balloons for meterological observations? Explain why no chemical compound of helium is known. Questions 6 to 10 are one word answers: Q6. Q7. Q8. Q9. Q10. Name the method used for refining of Zirconium metal? Why do amines behave as nucleophiles? Name the element which can exhibit the highest oxidation state in 3d-series. What kind of drug is phenacitin? Name the chemical reaction for converting benzene directly to benzaldehyde Questions 11 to 15 are multiple choice questions:

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