(A) Al3O2
(B) Al3O3
(C) Al2O2
(D) Al2O3
The answer is: (D) Al2O3
Tag: competitive exam chemistry mcqs
The only nonmetal element that exists in liquid form is
(A) Bromine
(B) Mercury
(C) Calcium
(D) Platinum
The answer is: (A) Bromine
The elements in any one group have similar
(A) atomic number
(B) mass number
(C) properties
(D) radioactivity
The answer is: (C) properties
The first period of elements consists of only
(A) hydrogen
(B) hydrogen and helium
(C) hydrogen and oxygen
(D) hydrogen and nitrogen
The answer is: (B) hydrogen and helium
The average human body contains about ________ gram of Sodium Chloride.
(A) 190
(B) 210
(C) 230
(D) 250
The answer is: (D) 250
Vitamin ________ is also called ascorbic acid.
(A) D
(B) A
(C) E
(D) C
The answer is: (D) C
One atomic mass unit (amu) is a mass unit equal to exactly one-twelth the mass of a ________ atom.
(A) carbon-8
(B) carbon-12
(C) carbon-16
(D) carbon-20
The answer is: (B) carbon-12
A ________ consists of the elements in any one horizontal row of the periodic table.
(A) block
(B) base
(C) group
(D) period
The answer is: (D) period
An electrolyte is a substance that produces ________ solution when dissolved in water.
(A) conducting
(B) nonconducting
(C) poorly conducting
(D) B and C
The answer is: (A) conducting
The molecular formula of surcose (sugar or table sugar) is
(A) C6H12O6
(B) C12H22O11
(C) C6H12
(D) C12H22
The answer is: (B) C12H22O11