Blue colour of the sky is due to
- absorption of light by dust particles
- reflection of light by dust particles
- scattering of light by dust particles
- presence of clouds which are a colloidal dispersion of water particles in air
The Correct Option is C
Solution and Explanation
Top Questions on Surface Chemistry
- The adsorbent used in adsorption chromatography is/are
A. silica gel
B. alumina
C. quick lime
D. magnesia
Choose the most appropriate answer from the options given below :- JEE Main - 2024
- Chemistry
- Surface Chemistry
- Adsorption' principle is used for which of the following purification method?
- JEE Main - 2024
- Chemistry
- Surface Chemistry
In the given TLC, the distance of spot \( A \) and \( B \) are 5 cm and 7 cm, from the bottom of the TLC plate, respectively. The \( R_f \) value of \( B \) is \( x \times 10^{-1} \) times more than \( A \). The value of \( x \) is _________ .- JEE Main - 2024
- Chemistry
- Surface Chemistry
- To form a complete monolayer of acetic acid on 1g of charcoal, 100 mL of 0.5M acetic acid was used. Some of the acetic acid remained unadsorbed. To neutralize the unadsorbed acetic acid, 40 mL of 1M NaOH solution was required. If each molecule of acetic acid occupies P x 10−23 m2 surface area on charcoal, the value of P is _____.
[Use given data: Surface area of charcoal = 1.5 x 102 m2g−1 ; Avogadro’s number (NA) = 6.0 x 1023 mol−1 ]- JEE Advanced - 2024
- Chemistry
- Surface Chemistry
Which compound is added to cement to increase its setting time?
- JEE Main - 2023
- Chemistry
- Surface Chemistry
Questions Asked in UP CPMT exam
- The concepts of 'struggle for existence' and 'survival of the fittest' are essential parts of the evolutionary theory given by
- UP CPMT - 2015
- What Are The Evidences For Evolution?
- Which of the following is a gymnosperm in which vessels are found?
- UP CPMT - 2015
- Kingdom Plant
- If earth suddenly shrinks by one-third of its present radius, the acceleration due to gravity will be
- UP CPMT - 2015
- Gravitation
- If a wire is stretched to make it $0.1\%$ longer, its resistance will
- UP CPMT - 2015
- Current electricity
- Boiling point of chloroform was raised by $0.323 \,K$, when $0.5143\, g$ of anthracene was dissolved in its $35 \,g$. Molecular mass of anthracene is $(K_b$ for $CHCl_3 = 3.9 \,K \,kg\,, mol^{-1})$
- UP CPMT - 2015
- Solutions
Concepts Used:
Surface Chemistry
The study of the chemical phenomena that occur at the interface of two surfaces which can be solid-liquid, solid-gas, solid-vacuum, liquid-gas, etc.
Read Also: Surface Chemistry
Applications of surface chemistry are:
Adsorption:
The process of attraction and aggregation of the molecules of a substance on the surface of a solid is known as adsorption. For Example, N2 adsorbs on the surface of activated charcoal
Two types of adsorption are:-
- Chemisorption: It is also known as Chemical Adsorption.
- Physisorption: It is also known as Physical Adsorption.
Corrosion:
The process through which the refined metals convert themselves into more stable compounds is known as corrosion.
Crystallisation:
The type of technique used in order to purify the substances to separate Solids from liquids is known as crystallisation.
Heterogeneous Catalysis:
The process wherein a catalyst is used in order to increase the rate of a chemical reaction is known as catalysis. The catalyst does not undergo any transformation and can be recovered in a chemically unchanged state.
There are two types of catalysis:-
- When the catalyst involved and the reacting substances are same states of matter or in the same phase, it is known as Homogeneous Catalysis.
- When the catalyst involved and the reacting substances are in different states of matter or different phases, it is known as Heterogeneous Catalysis.
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