Selina Concise Chemistry Class 6. We covered all the Selina Concise Chemistry Class 6 MCQs in this post for free so that you can practice well for the exam.
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Selina Concise Chemistry Class 6 Objective for Students
Correct the statement about nanomaterial:
(A) Have a large surface area
(B) Have the same volume as that of macro size
(C) Have more chemical reactivity due to more surface area
(D) All of these
Option d – All of these
Catalytic activity in nanomaterial is more due to:
(A) Increase in surface area
(B) Decrease in volume
(C) Same particle size
(D) All of these
Option a – Increase in surface area
Nanogold is used as a catalyst in:
(A) Organic reactions
(B) Photocatalysis
(C) Polymerization
(D) Metal extraction
Option a – Organic reactions
The melting point of the material in nanosize will ………
(A) Decrease
(B) Increase
(C) Remain the same
(D) Cannot predict
Option a – Decrease
One-dimensional nanostructures have ………. dimensions in the nanoscale:
(A) 1
(B) 2
(C) 3
(D) 4
Option b – 2
An example of a two-dimensional nanostructure is:
(A) Nanoparticles
(B) Nanorods
(C) Thin films
(D) Nanorings
Option c – Thin films
Material having all three dimensions less than 100 nm is:
(A) Nanoparticles
(B) Quantum dots
(C) Nanoscales
(D) All of these
Option d – All of these
Material having two dimensions in nanoscale:
(A) Nanotubes
(B) Fibres
(C) Nanowires
(D) All of these
Option d – All of these
Materials having only one dimension in the nanoscale are:
(A) Thin films
(B) Layers
(C) Coating
(D) All
Option d – All
The color of gold in the nanoscale is:
(A) Yellow
(B) Red
(C) Blue
(D) Black
Option b – Red
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