Chemistry Questions and Answers for Competitive Exam

Rajesh Bhatia2 years ago 45.8K Views Join Examsbookapp store google play
Chemistry-Questions-and-Answers


Chemistry Questions and Answers

Q.15 The number of atoms present in 21.6 gram of silver (atomic weight = 108) is the same as the molecules in

(A) 1.8 gram of H2O

(B) 12 moles of KMnO4

(C) 0.6N H2SO4

(D) 4.6 gram of C2H5OH


Ans .  B

Q.16 The National Chemical Laboratory is situated in

(A) New Delhi

(B) Bangalore

(C) Pune

(D) Patna


Ans .  C

Q.17 Equal masses of oxygen, hydrogen, and methane are kept under identical conditions. The ratio of the volumes of gases will be

(A) 2 : 16 : 2

(B) 2 : 16 : 1

(C) 1 : 16 : 2

(D) 1 : 1 : 1


Ans .  C

Q.18 The mass number of an atom is equal to

(A) the number of protons

(B) the number of protons and electrons

(C) the number of nucleons

(D) the number of neutrons


Ans .  C

Q.19 The high reactivity of fluorine is due to

(A) its high electronegativity

(B) small size of fluorine atom

(C) availability of d-orbitals

(D) strong F - F bond


Ans .  A

Q.20 The iron ore magnetite consists of

(A) Fe2O3

(B) Fe3OH4

(C) FeCO3

(D) 3Fe2O3 .. 3H2O


Ans .  A

Q.21 The ionization energy of the hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is

(A) 5x/36

(B) 5x

(C) 7.2 x

(D) x/6


Ans .  A

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    Rajesh Bhatia

    A Writer, Teacher and GK Expert. I am an M.A. & M.Ed. in English Literature and Political Science. I am highly keen and passionate about reading Indian History. Also, I like to mentor students about how to prepare for a competitive examination. Share your concerns with me by comment box. Also, you can ask anything at linkedin.com/in/rajesh-bhatia-7395a015b/.

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