Home: Chemistry MCQs
Q. The mass number is the total number of _____ and _____ in nucleus of an atom.
(A) protons, neutrons
(B) protons, electrons
(C) neutrons, electrons
(D) electrons, positrons
The answer is: (A) protons, neutrons ☑
Q. Isotopes are atoms whose nucleus have the same number of _____ but different number of _____.
(A) protons, neutrons
(B) protons, electrons
(C) neutrons, electrons
(D) electrons, positrons
The answer is: (A) protons, neutrons ☑
Q. The atomic mass unit (amu) is equal to
(A) 1.66054×10–15 kg
(B) 1.66054×10–19 kg
(C) 1.66054×10–23 kg
(D) 1.66054×10–27 kg
The answer is: (D) 1.66054×10–27 kg ☑
Q. Burning of sodium in chlorine produces
(A) clouds
(B) pencil
(C) salt
(D) smoke
The answer is: (C) salt ☑
Q. The molecular formula of surcose (sugar or table sugar) is
(A) C6H12O6
(B) C12H22O11
(C) C6H12
(D) C12H22
The answer is: (B) C12H22O11 ☑