Chemistry MCQ Quiz Hub

1. The element cesium bears resemblance with
Ca
Cr
Both of the above
None of the above

2. The ore CaSO4.H2O has the general name
Gypsum
Dolomite
Calcite
Plaster of Paris

3. Downs cell is used to prepare
Sodium carbonate
Sodium bicarbonate
Sodium metal
Sodium hydroxide

4. Which element is produced at the cathode during the electrolysis of brine in Nelsons cell?
H2
Na
C?2
O2

5. Ammonia may be prepared by heating ammonium chloride with
Water
NaCl
Aqueous sodium hydroxide
H2SO4

6. Calcium carbide is prepared by heating lime with coke at
2500?C
2600?C
2700?C
2800?C

7. Crystals of Na2CO3. 10H2O when exposed to air
Lose water and remain solid
Gain water and remain solid
Gain water and become liquid
Remains unchanged

8. Which one of the following substances conducts electricity by the movement of ions?
Graphite
Copper
Molten sodium chloride
Mercury

9. Which one of the following gives white precipitate with aqueous solution of BaC?2?
NaHCO3
NaNO3
Na2CO3
Na2CrO4

10. Which one of the following carbonate is water insoluble?
Na2CO3
K2CO3
(NH4)2CO3
CaCO3

11. The deliquescence is a property in which a solid
Absorbs moisture and remains solid
Absorbs moisture and turns to liquid form
Loses water of crystallization
Increases the number of water of crystallization

12. In diaphragm cell hydrogen is discharged by the reduction of
Water
HCI
Na+
NaCl

13. In diaphragm cell level of brine in anode compartment is kept slightly higher which prevents
Hydroxide ions to reach anode
Chlorine gas to mix
Cathode to decay
All of the above

14. Gypsum is applied to the soil as a source of
Ca and P
S and P
Ca and S
we could not apply

15. Alkali and alkaline earth metals impart colours when heated over burner. It is due to
Smaller electronegativity of alkali metals
Smaller ionic radius of these metals
Excitation of Excitation of electrons from low energy levels to higher energy levels
Excitation of electrons from low energy levels to higher energy levels

16. Which one of the following alkali metals forms only normal oxide when it reacts with O2?
Lithium
Sodium
Potassium
Rubidium

17. First ionization potential of alkaline earth metal is greater than alkali metals because
They are more reactive
They have greater atomic radii
They have smaller atomic sizes
All

18. Which one of the following pairs shown diagonal relationship in the periodic table?
Sodium and Lithium
Lithium and magnesium
Lithium and beryllium
Boron and Beryllium

19. NaOH is named as caustic soda because
It corrodes the organic tissues
It is used in soda water
It reacts with chlorine gas
It reacts with fats to form soap

20. Sodium is not observed in +2 oxidation state because of its
high first ionization potential
high second ioniation potential
high ionic radius
high electronegativity

21. Carnalite has chemical formula
KCI
KCI.MgCl2.6H2O
Na2B4O7.10H2O
CaCO3.MgCO3

22. Magnesium metal does not burn in the vessel containing
N2
O2
N2 and O2
Ne

23. Electrolysis of dilute solution of NaCl results at the anode
sodium
hydrogen
chlorine
oxygen

24. Second ionization potential of alkali metals are very high due to
being s-block elements
inert gas configurations
ns1 electronic configuration
being metals

25. Which ion will have maximum value of heat of hydration?
A1+3
Cs+
Ba+
Mg+2

26. Which one can form complex?
Na
Cr
Li
K

27. Which one is natron?
Na2CO3
Na2CO3.10H2O
Na2CO3.H2O
NaHCO3

28. Addition of 2% gypsum in cement
Triggers hydration
Triggers hydrolysis
Prevents rapid hardening
all of the above

29. Which one is least ionic in nature and decompose on heating.
LiOH
NaOH
KOH
CsOH

30. Among the halogens the rare element is
Fluorine
Chlorine
Astatine
Iodine

31. The colour of chlorine gas is
pale yellow
freenish yellow
reddish brown
grayish black

32. Vander Waals forces are stronger in
F2
Cl2
Br2
I2

33. The most powerful oxidizing agent among the halogens is
F2
Cl2
Br2
I2

34. Which of the following statements is incorrect about fluorine
fluorine is restricted to -1 oxidation state
fluorine follows octet rule and as well as extended octet rule
fluorine has lowest dissociation energy among the halogens
both b and c

35. The halogen which reacts spontaneously with gold (Au) to form Au+3 is
F2
Cl2
Br2
I2

36. Which one of the following is the weakest acid in water
HF
HCI
HBr
HI

37. The halogen which reacts very slowly with halogen is
Fluorine
Chlorine
Bromine
Iodine

38. Which of the following represents the correct electronic configuration of VII A group elements in the ground state?
ns2p2
ns2p4
ns2p5
ns2p6

39. The halogen having highest electron affinity is
Fluorine
Chlorine
Bromine
Iodine

40. Which is the strongest acid?
HCIO
HCIO2
HCIO3
HCIO4

41. Bromine can be liberated from KBr solution by the action of
Iodine solution
Chlorine
NaCl
Ki

42. Bleaching powder is an example of
Normal salt
Double salt
Mixed salt
Complex

43. Consider the following reaction- 2KCIO3 + H2C2O4 + H2SO4 ? K2SO4 + 2H2O + 2CO2 + Oxide Which oxide of chlorine is produced in the above reaction?
Cl2O
ClO2
Cl2O6
Cl2O7

44. Which of the following oxides of iodine is used for quantitative analysis of CO?
I2O4
I4O2
I2O5
All are equally useful

45. Consider the following reaction- 3Cl2 + 6NaOH ? NaClO3 + 5NaCl + 3H2O This reaction is
Displacement reaction
Double displacement reaction
Disproportionation reaction
Reduction reaction

46. Which of the halogen has highest electronegativity?
Fluorine
Chlorine
Bromine
Iodine

47. Which of the halogen can displace other three elements?
Flourine
Chlorine
Iodine
Bromine

48. Which of the following statements is incorrect about halogens?
All are non-metals
All the halogens have electronic conviguration ns2p5
They have high electron attinity and ionization energy
All the halogens react with noble gases to form their halides

49. The chemical formula of sodium hypochlorite is
NaCLO
NaClO2
NaClO3
NaClO4

50. Fluorine can react with
Xe
Kr
Rn
All of the above