Board Paper of Class 10 2019 Maths Abroad(Set 2) - Solutions
General Instructions:
(i) All questions are compulsory.
(ii) The question paper consists of 30 questions divided into four sections – A, B, C and D.
(iii) Section A comprises 6 questions of 1 mark each. Section B contains 6 questions of 2 marks each. Section C contains 10 questions of 3 marks each. Section D contains 8 questions of 4 marks each.
(iv) There is no overall choice. However, an internal choice has been provided in two questions of 1 mark, two questions of 2 marks, four questions of 3 marks each and three questions of 4 marks each. You have to attempt only one of the alternative in all such questions.
(v) Use of calculators is not permitted.
- Question 1
(a) How do you convert the following:
(i) Phenol to Anisole
(ii) Ethanol to Propan-2-ol
(b) Write mechanism of the following reaction:
(c) Why phenol undergoes electrophilic substitution more easily than benzene?OR
(a) Account for the following:
(i) o-nitrophenol is more steam volatile than p-nitrophenol.
(ii) t-butyl chloride on heating with sodium methoxide gives 2-methylpropene instead of t-butylmethylether.
(b) Write the reaction involved in the following:
(i) Reimer-Tiemann reaction
(ii) Friedal-Crafts Alkylation of Phenol
(c) Give simple chemical test to distinguish between Ethanol and Phenol.OR
For what values of k does the quadratic equation 4x2 − 12x − k = 0 have no real roots? VIEW SOLUTION
- Question 2
Find the distance between the points (a, b) and (−a, −b). VIEW SOLUTION
- Question 3
Find a rational number between and .
OR
Write the number of zeroes in the end of a number whose prime factorization is 22 × 53 × 32 × 17. VIEW SOLUTION
- Question 4
Let ∆ ABC ∽ ∆ DEF and their areas be respectively, 64 cm2 and 121 cm2. If EF = 15⋅4 cm, find BC. VIEW SOLUTION
- Question 5
Evaluate: OR
Express (sin 67° + cos 75°) in terms of trigonometric ratios of the angle between 0° and 45°. VIEW SOLUTION
- Question 6
Find the number of terms in the A.P. : VIEW SOLUTION
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