InstaQB

Home
Institutions
- Institutions
  
  Polytechnic Colleges
  
  Medical Colleges
  
  Arts & Science Colleges
  
  Universities
  
  Engineering Colleges
  
  Agricultural Colleges
  
  Research Institute
  
  Law Colleges
  
  Audiology and Speech Colleges
  
  Business & Management colleges
  
  Nursing colleges
  
  Hotel Management institutes
  
  Aeronautical Colleges
  
  Bachelor's Degree
Syllabus
Courses
Stateboard
- 12th Standard English Medium
  
  Maths
  
  Physics
  
  Chemistry
  
  Biology
  
  Computer Science
  
  Business Maths
  
  Economics
  
  Commerce
  
  Accountancy
  
  History
  
  Computer Applications
  
  Computer Technology
  12th Standard Tamil Medium
  
  உயிரியல்
  
  கணினி பயன்பாடுகள்
  
  கணினி அறிவியல்
  
  வணிகக் கணிதம்
  
  வணிகவியல்
  
  பொருளியல்
  
  கணிதவியல்
  
  வேதியியல்
  
  இயற்பியல்
  
  கணினி தொழில்நுட்பம்
  
  வரலாறு
  
  கணக்குப்பதிவியல்
  11th Standard English Medium
  
  Maths
  
  Commerce
  
  Economics
  
  Biology
  
  Business Maths
  
  Accountancy
  
  Computer Science
  
  Physics
  
  Chemistry
  
  Computer Applications
  
  History
  
  Computer Technology
  
  Bio - Zoology
  11th Standard Tamil Medium
  
  கணிதவியல்
  
  உயிரியல்
  
  பொருளியல்
  
  இயற்பியல்
  
  வேதியியல்
  
  வணிகக் கணிதம்
  
  கணினி அறிவியல்
  
  கணக்குப்பதிவியல்
  
  வணிகவியல்
  
  கணினி பயன்பாடுகள்
  10th Standard English Medium
  
  Mathematics
  
  Science
  
  Social Science
  
  9th Standard English Medium
  
  Mathematics
  
  Science
  
  Social Science
  
  8th Standard English Medium
  
  Mathematics
  
  Science
  
  Social Science
  7th Standard English Medium
  
  Mathematics
  
  Science
  
  Social Science
ICSE/ISC
- Class XII
  
  Mathematics
  
  Physics
  
  Accountancy
  
  Biology
  
  History
  
  Geography
  
  Psychology
  
  chemistry
  
  Economics
  
  Computer Science
  
  Political Science
  
  Business Studies
  Class XI
  
  Accountancy
  
  Chemistry
  
  Mathematics
  
  Biology
  
  Geography
  
  Physics
  
  History
CBSE
- 12Th Standard
  
  Physics
  
  Chemistry
  
  Maths
  
  Biology
  
  History
  
  Economics
  
  Commerce
  
  Geography
  
  Socialogy
  
  Business Studies
  
  Computer Science
  
  Biotechnology Class
  
  Political Science
  
  Home Science
  11Th Standard
  
  Physics
  
  Chemistry
  
  Maths
  
  Biology
  
  History
  
  Economics
  
  Commerce
  
  Socialogy
  
  Business Studies
  
  Geography
  
  Home Science
  
  Computer Science
  
  Biotechnology Class
  
  Political Science
  10Th Standard
  
  Physics
  
  Chemistry
  
  Biology
  
  Mathematics
  
  Economics
  
  Geography
  
  History & Civics
  
  Computer Application
  9Th Standard
  
  Physics
  
  Chemistry
  
  Biology
  
  mathematics
  
  Computer Application
  
  Economics
  
  Geography
  
  History & Civics

12th Chemistry Monthly Test - 1 (Surface Chemistry)

St. Britto Hr. Sec. School - Madurai

12th Chemistry Monthly Test - 1 (Surface Chemistry)-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Which among the following is not correct with regards to enzyme catalysis?

The rate of enzyme catalysis varies with pH.
Enzyme catalysis is highly specific in nature.
Catalytic activity of enzymes is increased by co-enzymes
Enzymes cannot be inhibited

Which among the following is found to be solvent loving in nature?

Lyophilic
Lyophobic
Gel
Sol

Emulsifying agent is used for____

precipitation of an emulsion
coagulation of an emulsion
stabilization of an emulsion
none of these

Tyndall effect is a_______ property of colloidal particles.

optical
kinetic
electrical
eletronic

An example of positively charged colloid is_____

clay
starch
Ag
haemoglobin

The process of separation of emulsion into two separate layers is called______

Emulsification
Deemulsification
Coagulation
Flocculation

The decomposition of hydrogen peroxide in the presence of colloidal platinum is a/an

positive catalysis
negative catalysis
auto-catalysis
induced catalysis

Hair cream is

gel
emulsion
solid sol
sol

Which one of the following has minimum gold number?

starch
sodium oleate
gum arabic
gelatin

The rate of decomposition of hydrogen peroxide decreases in presence of

Platinum
Iron
MnO₂
Glycerine

______enzyme hydrolyses starch into maltose.

pepsin
diastase
zymase
urease

The multilayer adsorption of gases on solids take place in

physical adsorption
chemisorption
sols
active centres

In auto catalysis ___ acts as catalyst.

reactant
product
bothnone
none

Which among the following reactions is an example of auto catalysis?

(i) CH₃COOC₂H₅ + H₂O \(\longrightarrow\) CH₃COOH + C₂H₅OH
(ii) 2H₂O₂ \(\longrightarrow\) 2H₂O + O₂
(iii) 2SO₂ + O₂ \(\longrightarrow\) 2SO₃
(iv) 2AsH₃ \(\longrightarrow\) 2As + 3H₂
only (i)

(i) and (ii)

(i) and (ii)

(i) and (iv)
The Tyndall's effect associated with colloidal particles is due to
presence of charge

scattering of light

absorption of light

reflection of light

A substance that enhances the catalytic activity of the catalyst is

gel
sol
promoter
poison

Part - B

Generic 2 - Answer All Question

What is difference between sol, gel and emulsion?

Explain intermediate compound formation theory of catalysis with an example.

Explain O/W and W/O types of emulsions with examples.

What do you mean by inversion of phase?

What is ultrasonic dispersion?

Define adsorbent and adsorbate.

What is the difference between homogenous and hetrogenous catalysis?

What are limitations of Freundlich adsorption isotherm?

Define Deemulsification.

Why are colloids purified?

What is a dispersed phase and a dispersion medium in a colloid?

Explain any one method for coagulation
Heat of adsorption is greater for chemisorptions than physisorption. Why?

Addition of Alum purifies water. Why?
In a coagulation experiment, 10 mL of a colloid (X) is mixed with distilled water and 0.1M solution of an electrolyte AB so that the volume is 20 mL. It was found that all solutions containing more than 6.6 mL of AB coagulate within 5 minutes. What is the flocculation values of AB for sol (X)?

What causes Brownian movement in a colloid?

What are the two types of catalysis?

Part - C

Generic 3 - Answer All Question

Name two industrial process where heterogeneous catalysts are used.

How is coagulation brought about by addition of electrolytes?

Write a note.

(i) Positive catalyst
(ii) Negative catalyst

What are the tests used to identify the type of emulsion?
Write a note on auto catalysis?

Give an example for a reaction catalysed by nano particles.

What are emulsifying agent?

Write the optical properties of colloids with diagram.

Name various techniques by which a colloid can be deemulsified.

What are the advantages of Brownian movement?
What are the important concepts of catalysis that adsorption theory explains?

Define Gold number.

Part - D

Generic 5 - Answer All Question

Write a note on Freundlich adsorption isotherm.

Explain electrodialysis.

Name the method to deduce the charge of the sol particle. Explain it with a neat diagram.
Explain the following
(i) Reactant selectivity
(ii) Transition state selectivity
(iii) Product selectivity

Explain the factors affecting adsorption.

Explain the electrical property of colloids with a neat diagram.

Comment

Add Comment

Tamilnadu Stateboardszs - Class