A fermentation of grapes?
(A) chemical change is
(B) physical change
(C) Both chemical and physical changes
(D) Others
Which acid is found in vinegar?
(A) lactic acid
(B) citric acid
(C) Methanoic acid
(D) Acetic acid
Approximate pH value of lemon juice?
(A) 10
(B) 2.2
(C) 12
(D) 14
Which of the following is not nucleon?
(A) Proton
(B) Neutron
(C) Both (A) and (B)
(D) Positron
In the nucleus of Helium,
(A) four protons
(B) four neutrons
(C) two neutrons and two protons
(D) four protons and two electrons
Which of the following is not a normal salt?
(A)
(B)
(C)
(D)
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