12th Standard Chemistry Guide. We covered all the 12th Standard Chemistry Guide MCQs in this post for free so that you can practice well for the exam.
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12th Standard Chemistry Guide Objective for Students
A balloon filled up with gas would only go up in the air if it is filled up with:
(a) A gas whose density is lower than air
(b) A gas whose density is higher than air
(c) Cold air
(d) Water vapor
Option a – A gas whose density is lower than air
Which one of the following is not a semiconductor?
(a) Silicon
(b) Germanium
(c) Quartz
(d) Gallium arsenide
Option c – Quartz
The pH value of a sample of multiple-distilled water is:
(a) Zero
(b) 14
(c) Very near to zero
(d) Very near to seven
Option d – Very near to seven
Which one of the following is the most characteristic property of an element?
(a) Density
(b) Boiling point
(c) Mass number
(d) Atomic number
Option d – Atomic number
There are two elements – calcium (atomic number 20) and argon (atomic number 18). The mass number of both elements is 40. They are therefore known as:
(a) Isotones
(b) Isochores
(c) Isobars
(d) Isotopes
Option c – Isobars
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