421. An atom having a positive charge is called?
(A) Anion
B) Cation
(C) Ion
(D) Canion
422. What is the empirical formula of benzene?
(A) OH
B) CH
(C) CO
(D) HC
423. Elements are represented by which of the following?
A) Symbols
(B) Abbreviations
(C) Signs
(D) Chemical formulas
424. How much percentage of the earth’s crust consists of silicon?
(A) 20%
B) 28%
(C) 32%
(D) 36%
425. The branch of chemistry that deals with radioactivity, nuclear processes, and properties is called?
(A) Analytical chemistry
B) Nuclear chemistry
(C) Industrial chemistry
(D) Biochemistry
426. The word ‘Chemistry’ belongs to which language?
(A) English
(B) Japanese
(C) Spanish
D) Greek
427. Group number represents?
A) Same number of electrons in the valence shell
(B) Same number of electrons
(C) Same electronic configuration
(D) None of the above
428. Which of the following is paramagnetic:
A. O2
B. O2 +
C. O2-
D. All
429. Which of the following is not paramagnetic:
A. O2
B. O2 +
C. O2-
D. O2-2
430. Bond order of He2+ is:
A. 1
B. 2
C. 1/2
D. 3/2
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