(A) Atomic mass
(B) Mass number
(C) Atomic number
(D) None of the above
Tag: Chemistry mcqs
Number of isotopes of hydrogen is?
(A) 01
(B) 02
(C) 03
(D) 05
__ are the atoms of the same elements having same number of protons but different number of Neutrons.
(A) Isomers
(B) Polymers
(C) Isotopes
(D) None of the above
Number of proton+number of neutron is the __ of an element.
(A) Atomic number
(B) Ionic mass
(C) Mass number
(D) None of the above
Atomic number of sodium is?
(A) 09
(B) 10
(C) 11
(D) 12
Which model says that atom consists of small, dense, positively charged nucleus which is surrounded by electrons revolving around it?
(A) John Dalton’s atomic model
(B) Rutherford’s model of the atom
(C) Bohr’s model of the atom
(D) None of the above
What is the atomic weight of uranium?
(A) 237
(B) 238
(C) 240
(D) 242
Enzymes are?
(A) Organic catalyst
(B) Biological catalyst
(C) Chemical catalyst
(D) Inorganic catalyst