Focus Guide for 12th Chemistry. We covered all the Focus Guide for 12th Chemistry MCQs in this post for free so that you can practice well for the exam.
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Focus Guide for 12th Chemistry Objective
Which one of the following gases produces a red light when electricity flows through it?
(a) Helium
(b) Argon
(c) Nitrogen
(d) Neon
Option d – Neon
Which one of the following methods can be used to remove the permanent hardness of water?
(a) Boiling
(b) Ion-exchange
(c) Lime treatment
(d) Bubbling sulfur dioxide gas
Option b – Ion-exchange
Which one of the following is NOT a component of photochemical smog?
(a) Ozone
(b) Peroxyacetyl nitrate
(c) Polycyclic aromatic hydrocarbons
(d) Nitric oxide
Option c – Polycyclic aromatic hydrocarbons
Which one of the following statements is NOT correct?
(a) Buckminsterfullerene is an allotrope of carbon
(b) Diamond is a good conductor of electricity
(c) In graphite, each carbon atom is linked to three other carbon atoms
(d) Atomic weight is the most fundamental characteristic of an element
Option b – Diamond is a good conductor of electricity
Which one of the following statements about alkaline earth metals is NOT true?
(a) Strontium salts burn with a red flame
(b) Barium metal is used in medicine to examine the alimentary canal of a patient by X-ray
(c) Green plants need magnesium to make the chlorophyll that traps energy from sunlight in photosynthesis
(d) The red color of the gemstone Ruby is due to the element beryllium present in it
Option d – The red color of the gemstone Ruby is due to the element beryllium present in it
Which one of the following is the most fundamental characteristic of an element?
(a) Melting point
(b) Atomic number
(c) Colour
(d) Atomic weight
Option b – Atomic number
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