Chemistry MCQs Test 10

1. When sodium bicarbonate is heated to get sodium carbonate, all are produced EXCEPT?

  • (a) CO
  • (b) CO2
  • (c) Na2CO3
  • (d) H20
See Answer
(a) CO

2. The fourth flotation process is the concentration of are by?

  • (a) Magnetically
  • (b) Wetting the ore
  • (b) Difference in density
  • (d) chemically
See Answer
(b) Wetting the ore

3. Are the raw materials for the accruing of soda ash EXCEPT?

  • (a) Ammonia
  • (b) Limestone
  • (b) brine
  • (d) carbon monoxide
See Answer
(d) carbon monoxide

4. Matte is a mixture of?

  • (a) CuS and FeS
  • (b) Cu20 and FeS
  • (b) Cu2S and FeS
  • (d) Cu20 and FeO
See Answer
b) Cu20 and FeS

5. The impurity present in minerals is called?

  • (a) Metal
  • (b) Ore
  • (b) Gangue
  • (d) salt
See Answer
(b) Gangue

6. All are the raw materials for the manufacturing of urea EXCEPT?

  • (a) CO2
  • (b) NH3
  • (b) H2O
  • (d) NaCI
See Answer
(d) NaCI

7. What Percentage of nitrogen in urea is?

  • (a) 14
  • (b) 28
  • (c) 60
  • (d) 46
See Answer
(d) 46

8. Blister copper is refined through?

  • (a) Concentration
  • (b) reduction
  • (b) Smelting
  • (d) electrolysis
See Answer
(d) electrolysis

9. Petroleum is separated into different fractions by the process of?

  • (a) Simple distillation
  • (b) condensation
  • (b) Fractional distillation
  • (d) destructive distillation
See Answer
(b) Fractional distillation

10. Are all steps used for the extraction of metals except?

  • (a) Roasting
  • (b) smelting
  • (b) Evaporation
  • (d) bessmiraization
See Answer
(b) Evaporation

11. Sodium carbonate (Na2CO3) is also known as?

  • (a) Washing soda
  • (b) soda ash
  • (b) Both of these
  • (d) none of these
See Answer
(b) Both of these

12. Which of the following are the waterborne diseases?

  • (a) Cholera
  • (b) dysentery
  • (b) Typhoid fever
  • (d) all of these
See Answer
(d) all of these

13. bond lengths is diamond crystal are

  • A) 1.54 pm
  • B) 154 pm
  • C) 109.5 pm
  • D) 1540 pm
See Answer
B) 154 pm

14. In interior of silicone (IV) oxide crystal, each silicone atom is directly connected with

  • A) Two O-atom
  • B) Four O-atom
  • C) Two O-atom and two Si-atom
  • D) Four Si-atom
See Answer
B) Four O-atom

15. Iodine is a molecular solid because the force between its molecules are

  • A) Ionic
  • B) Metallic
  • C) Covalent
  • D) Vander wall’s forces
See Answer
D) Vander wall’s forces

16. The coordination number of each ion in NaCl is

  • A) 4
  • B) 6
  • C) 8
  • D) 10
See Answer
B) 6

17. The beast conductors of electricity are

  • A) Ionic solids
  • B) Molecular solids
  • C) Metallic solids
  • D) Covalent solids
See Answer
C) Metallic solids

18. Which of the following statement is incorrect about silica

  • A) Every silicon atom is bonded tetrahedrally to four oxygen atom
  • B) Every oxygen atom is bonded to two silicon atoms
  • C) Structure of silica is considered to be essentially one molecule
  • D) Has very thermal expansion
See Answer
D) Has very thermal expansion

19. The strength of hydrogen bonding is

  • A) 20 times less than a covalent bond
  • B) 20 times more than a covalent bond
  • C) 20 times less than a ionic bond
  • D) 20 times more than a ionic bond
See Answer
A) 20 times less than a covalent bond

20. Lower alcohols are soluble in water because

  • A) Intermolecular hydrogen bonding
  • B) Dipole induced dipoles
  • C) Low electro-negativity difference between C and H
  • D) All of the above
See Answer
A) Intermolecular hydrogen bonding

21. Hydrogen bonding is maximum in

  • A) Diethyl ether
  • B) Benzene
  • C) Ethanol
  • D) Water
See Answer
D) Water

22. The strongest H-bond is

  • A) F—H
  • B) N—-H
  • C) O—-H
  • D) O—-F
See Answer
A) F—H

23. When two ice cubes are passed over each other, they unite to form one cube. This is due to

  • A) Covalent attraction
  • B) Hydrogen bond formation
  • C) Ionic bond formation
  • D) Metallic bond formation
See Answer
B) Hydrogen bond formation

24. Strong dipole-dipole forces among the liquid molecules are responsible for

  • A) Very high heat of vaporization
  • B) Very low heat of vaporization
  • C) Very low boiling point
  • D) All are correct
See Answer
A) Very high heat of vaporization

25. Which one of the following arrangement usually represents the correct order of increasing interactions?

  • A) Hydrogen bonding, London forces, Dipole – Dipole
  • B) London forces, Hydrogen bonding, Dipole – Dipole
  • C) London forces, Dipole – Dipole, Hydrogen bonding
  • D) Dipole – Dipole, London forces, Hydrogen bonding
See Answer
C) London forces, Dipole – Dipole, Hydrogen bonding

26. Propanone is miscible in water due to

  • A) Both are polar molecules
  • B) Dipole-dipole attraction between them
  • C) Hydrogen bonding between  them
  • D) All of these
See Answer
D) All of these

27. Which of the following can form hydrogen bonding among its molecules more prominently

  • A) CH3OH
  • B) CHCl3
  • C) CH33
  • D) All of these
See Answer
A) CH3OH
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