Question

Assertion- Colloidal particles are big enough to scatter light.
Reason- Composition of a compound is the same throughout.

A)Both A & R are correct and R is the correct explanation of A
B)A & R are correct but R is not the correct explanation of A
C)A is true but R is false
D)A is false but R is true
E)Both are false​

Answer 1

B) Assertion and reason are correct but reason is not the correct explanation of Assertion.

Explanation:

Colloids

• Colloids are heterogeneous mixtures in which the particle size  is too small to be seen with the naked eye, but is big enough to  scatter light.
• The particles are called the dispersed phase and the medium in  which they are distributed is called the dispersion medium.
• Particles of colloids easily scatter a beam  of visible light.
• This  scattering of a beam of light is called the  Tyndall effect.

Compound

• A compound is a substance composed of two  or more elements, chemically combined with  one another in a fixed proportion.

• Elements react to form new compounds. The composition of each new substance  is always fixed. The new substance has totally different properties.

• The composition of a compound is the  same throughout.  The texture and color of the  compound are the same throughout.