Applied Chemistry MCQs

By: Prof. Dr. Fazal Rehman | Last updated: May 21, 2025

1. : In ___________ pre-ignition of the fuel is seen
(A) petrol knocking
(B) petrol cracking
(C) diesel cracking
(D) diesel knocking

2. : _________ is also called as knocking.
(A) cracking
(B) pinging
(C) doping
(D) crushing

3. : In _________ gasoline vapours are purified.
(A) thermal cracking
(B) catalytic cracking
(C) stabilization
(D) knocking

4. : What catalyst is used in the catalytic cracking?
(A) NaCl
(B) KCl
(C) ZnSO₄
(D) Al₂O₃

5. : Rating of _____ is called Octane number.
(A) petrol knocking
(B) diesel knocking
(C) petrol cracking
(D) diesel cracking

6. : The yield of petrol is _______ in liquid phase thermal cracking.
(A) 50%-60%
(B) 60%-70%
(C) 70%-80%
(D) 80%-90%

7. : _____ are used for the improvement of anti-knock of diesel.
(A) TEL
(B) Pre-ignition dopes
(C) Diethyl telluride
(D) N-hexadecane

8. : The best anti-knocking reagents of petrol are _____
(A) straight-chain alkanes
(B) straight-chain alkenes
(C) alkynes
(D) aromatics

9. : Choose the correct order of petrol knocking?
(A) aromatics → branched paraffins → olefins → cyclo paraffins → aromatics
(B) straight chain paraffins → olefins → branched paraffins → cyclo paraffins → straight chain paraffins
(C) straight chain paraffins → branched paraffins → olefins → cyclo paraffins → aromatics
(D) straight chain paraffins → branched paraffins → olefins → aromatics → cyclo paraffins

10. : The catalyst is reactivated after every _________ in fixed bed catalytic cracking.
(A) 8-10 hrs
(B) 20-24 hrs
(C) 5-7 hrs
(D) 12-15 hrs

11. : ______ layered structure is the structure of graphite.
(A) Three dimensional structure
(B) Pyramidal
(C) Planar
(D) Bipyramidal

12. : _____ is the distance between the planes of graphite.
(A) 0.876 nm
(B) 0.223 nm
(C) 0.124 nm
(D) 0.335 nm

13. : Bonding of the layers is_____
(A) Strong
(B) Weak
(C) Very tightly bonded
(D) Not bonded

14. : One of the properties of graphite is that it is _____ anisotropic.
(A) Highly
(B) Lightly
(C) Not
(D) Very less

15. : The graphite can easily be converted into ____ in the oxygen-containing atmospheres.
(A) Carbon monoxide
(B) Carbon dioxide
(C) Carbon monosulphide
(D) Carbon disulphide

16. : _________ is pressure applied in vapour phase cracking.
(A) 10–20 kg/cm²
(B) 100 kg/cm²
(C) 50 kg/cm²
(D) 80 kg/cm²

17. : The temperature achieved is __________ in vapour phase thermal cracking.
(A) 200–400°C
(B) 600–650°C
(C) 500–820°C
(D) 700–800°C

18. : The catalyst is in the form of ___________ in moving bed catalytic cracking.
(A) fine powder
(B) pallets
(C) liquid form
(D) gaseous form

19. : _________ is the pressure applied in fixed-bed catalytic cracking.
(A) 50 kg/cm²
(B) 100 kg/cm²
(C) 1.5 kg/cm²
(D) None of these

20. : In stainless steel, graphite goes through ____
(A) Microbial corrosion
(B) Crevice corrosion
(C) Pitting corrosion
(D) High-temperature corrosion

21. : Monocrystalline graphite is a ____ material.
(A) Paramagnetic
(B) Diamagnetic
(C) Ferromagnetic
(D) Ferrimagnetic

22. : The graphite is also known as _____
(A) White lead
(B) Black lead
(C) White coal
(D) Black coal

23. : The application of natural graphite is that it is mostly used in ______
(A) Refrigerators
(B) Laboratories
(C) Catalyst
(D) Fuel