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12th Chemistry Objective Questions And Answers PDF 2020 »allsarkariexams.com


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1 . The number of particles in a simple cubic per unit cell is :

One
two
three
four

ANSWER:-One

2. The number of particles in a face-centered cubic (fcc) per unit cell is

one
two
three
Four

ANSWER:-Four

 


3. The number of particles in a body-centered cubic (bcc) per unit cell IS :

one
Two
Three
Four

ANSWER:-Two

 


4. Graphite is an example of

  • Ionic Solid
  • Molecular Solid
  • Covalent Solid
  • Metallic Solid
ANSWER:-Covalent Solid

5. Possible Co-ordination number of Cation of tetrahedral structural Arrangement is:

  • 1
  • 2
  • 3
  • 4
ANSWER:-4

6. The molecularity of a reaction cannot be :

  • Zero
  • One
  • Two
  • Three
ANSWER:-Zero

7. Cuprite is an ore of :

  • Zn
  • Cu
  • Ag
  • Fe
ANSWER:-Cu

8. Calamine is an ore of :

  • Cu
  • Fe
  • Al
  • Zn
ANSWER:-Zn

9. Bauxite is an ore of :

  • Al
  • Fe
  • Cu
  • Zn
ANSWER:-Al

10. Sulphide ores are generally concentrated by :

  • Gravity separation method
  • Magnetic separation method
  • Froth floatation process
  • None of these
ANSWER:- Froth floatation process





11. Haematite is an ore of :

  • Al
  • Fe
  • Cu
  • Zn
ANSWER:-Fe

12. Unit Of rate constant for Second-order reaction, K is :

  • s⁻¹
  • mol⁻¹ L s⁻¹
  • mol⁻² L² s⁻¹
  • mol L⁻¹ s⁻¹
ANSWER:-mol⁻¹ L s⁻¹

13. Unit Of rate constant for First-order reaction, K is :

  • s⁻¹
  • mol⁻¹ L s⁻¹
  • mol⁻² L² s⁻¹
  • mol L⁻¹ s⁻1
ANSWER:-s⁻¹

14. Unit Of rate constant for third-order reaction, K is :

  • s⁻¹
  • mol⁻¹ L s⁻¹
  • mol⁻² L² s⁻¹
  • mol L⁻¹ s⁻¹
ANSWER:-mol⁻² L² s⁻¹

15. When nitroethane is treated with Li Al H4 the product formed is :

  • Methyl amine
  • Ethyl amine
  • Ethane
  • Acetamide
ANSWER:- Ethyl amine

16. Aldehyde and ketone can be distinguished by :

  • Tollen’s reagent
  • LiAIH4
  • HCN
  • None of these
ANSWER:- Tollen’s reagent

17. Among the halogen acids the one which is weakest is :

  • HBr
  • HI
  • HF
  • HCI
ANSWER:-HF

18. Which of the following is artificial sweetening agent :

  • Aspartame
  • Seconal
  • Aspirin
  • Sodium benzoate
ANSWER:-Aspartame

19. Acid chloride is reduced to aldehyde by :

  • wurtz reaction
  • Fittig reaciton
  • Rosenmund reduction
  • None of these
ANSWER:-Rosenmund reduction

20. Tollen’s reagent is:

  • Mixture of CuSO4 and NaOH
  • A solution of copper sulphate, sodium citrate and sodium carbonate
  • Ammonical silver nitrate solution
  • None of these
ANSWER:-A solution of copper sulphate, sodium citrate and sodium carbonate





21. Phenol is less acidic than:

  • Ehanol
  • Methanol
  • p-Nitrophenol
  • p- methylphenol
ANSWER:- p-Nitrophenol

22. The hybridization of Xe F2 Is :

  • sp³d²
  • sp³d
  • sp³
  • sp³d³
ANSWER:-sp³d

23. The hybridisation of Xe F4 Is :

sp³d²

s³d
sp³
sp³d³

ANSWER:-. sp³d²

24. Which one of the following is not a protein:

  • Nail
  • DNA
  • Hair
  • Wool
ANSWER:- DNA

25. Enzymes are:

  • Carbohydrates
  • Vitamins
  • Proteins
  • None of these
ANSWER:- Proteins

26. Vitamin A is Called

  • Retinol
  • Ascorbic acid
  • calciferol
  • Tocoferol
ANSWER:- Retinol

27. which of the Following is not found in RNA

  • Uracil
  • Adenine
  • Ammonium Acetate
  • Guanineetate
ANSWER:-Ammonium Ac

28. PVC is a

  • Addition polymer
  • Condensation polymer
  • copolymer
  • None of these
ANSWER:-Addition polymer

29. Phenol is used as :

  • Antiseptic
  • Disinfectants
  • Both a & b
  • None
ANSWER:-Both a & b

30. Antipyretics is a :

  • Quinone
  • Paracetamol
  • Luminal
  • None
ANSWER:- Paracetamol

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