Find WBJEE 2015 Solved Chemistry Question Paper – Part 1 in this article. This paper consists of 5 questions (#1 to #5) from WBJEE 2015 Chemistry paper. Detailed solution of these questions has been provided so that students can match their solutions.
Importance of Previous Years’ Paper:
Previous years’ question papers help aspirants in understanding exam pattern, question format, important topics and assessing preparation. It has also been seen that sometimes questions are repeated in WBJEE Exam. So, this paper will certainly boost your confidence.
About WBJEE Exam
WBJEE is a common entrance examinations held at state level for admission to the Undergraduate Level Engineering and Medical courses in the State of West Bengal. The Chemistry section of WBJEE 2015 engineering entrance exam consists of 40 questions.
41. Match the flame colours of the alkaline earth metal salts in the Bunsen burner.
(a) Calcium (p) brick red
(b) Strontium (q) apple green
(c) Barium (r) crimson
(A) a-p, b-r, c-q
(B) a-r, b-p, c-q
(C) a-q, b-r, c-p
(D) a-p, b-q, c-r
Ans : (A)
The correct flame coloration is
In Bunsen Burner,
Calcium burns as Brick Red.
Srtontium burns as Crimson Red.
Barium burns as Apple Green.
So, the correct option is A.
43. The atomic number of cerium (Ce) is 58. The correct electronic configuration of Ce3+ ion is
The atomic number of Xe is 54.
So, the electronic configuration of Ce is [Xe] 4f1 5d16s2
The atomic configuration of Ce3+ ion is [Xe] 4f1
For 1, 3-butadiene at room temp there is formation of 1,4- addition product. So, the product is
and the most stable one is (I).
So, (b) is the correct option.
It is a substitution reaction so the product formed is: