IIT JEE MCQ Quiz Hub

1. Mica is mainly
potassium aluminium silicate.
calcium aluminium silicate.
Calcium aluminium fluoride.
Calcium magnesium silicate.

2. Which pair contains species which can react with each other to produce dihydrogen gas?
Sodium amalgam and water
Hydrolith and water
Copper and water
Both (a) and (b).

3. The three isotopes of hydrogen differ from one another in
Atomic number
Number of protons
Nuclear charge
Nuclear mass.

4. By starting with 0.5 mol of sodium peroxide how many moles of dioxygen gas can be obtained by dropping excess of water on it
0.5 mole
1 mole
0.25 mole
mole.

5. In which property listed below hydrogen does not resemble with alkali metals?
Tendency to form cation
Nature of oxide
Combination with halogens
Reducing character.

6. Which of the following type of glass is generally used in the making of cut-glass objects?
Crookes glass
Lead potash glass
Borosil glass
Soft ordinary glass.

7. Acidified potassium permanganate is dropped over sodium peroxide taken in a round bottom flask at room temperature vigorous reaction takes place to produce
hydrogen peroxide
mixture of hydrogen and oxygen
a colourless gas hydrogen
a colourless gas dioxygen.

8. In ordinary hydrogen the approximate composition of ortho and parahydrogen is respectively
75% 25%
25% 75%
50% 50%
99% 1%.

9. Which of the following method is used to obtain pure hydrogen? Electrolysis of warm solution of barium peroxide using nickel electrodesBy the action of water on sodium hydride
Treatment of magnesium ribbon with pure dil.
Sulphuric acid
Electrolysis of warm solution of barium peroxide using nickel electrodesBy the action of water on sodium hydride
All the above mentioned methods

10. Hydrogen at the moment of its generation (newly born hydrogen) is generally called
Protium
Nascent hydrogen
Atomic hydrogen
Heavy hydrogen

11. Peroxide ion is isoelectronic with
Dihydrogen molecule
Dinitrogen molecule
Fluorine molecule
S atom.

12. Dipole moment of hydrogen peroxide is
greater than that of water
less than that of water
equal to that of water
unpredictable.

13. Aluminium reacts with boiling water to liberate dihydrogen gas along with the formation of
aluminium oxide
aluminium hydroxide
aluminium suboxide
aluminium superoxide.

14. The hydrolysis of one mol of peroxdisulphuric acid produces
Two mole of peroxomonosulphuric acid
Two moles of sulphuric acid
One mole of sulphuric acid and one mole of peroxomonosulphuric acid and one mole of peroxomonosulphuric acid
One mole of sulphuric acid one mole of peroxomonosulphuric acid and one mole of hydrogen peroxide.

15. Which elements out of the following do not produce hydrogen on treatment with caustic soda? I. (Zn) ; II. (Sn) ; III. (Mg) ; IV. (Cu) ; V. (Al)
I and V
III IV
IV V
II IV.

16. In which of the following compound the nitrogen atom exhibits negative oxidation state
Sodium nitrate
Nitric oxide
Sodium azide
Sodium nitrite.

17. Conversion of atomic hydrogen into molecular hydrogen is
an exothermic reaction
endothermic reaction
a nuclear change
photochemical change.

18. Ozone oxidizes iodine in the presence of moisture to
Sodium nitrate
Nitric oxide
Sodium azide
Sodium nitrite.

19. Water cannot act as
Oxidising agent
Reducing agent
Dehydrating agent
Hydrolytic agent.

20. In the laboratory preparation of hydrogen pure zinc is not used because.
pure zinc becomes passive due to the formation of oxide layer.
Pure zinc becomes passive due to the formation of sulphate layer over the metal
Pure zinc reacts slowly with the acid.
Pure zinc reacts with acid vigorously and violently.

21. The process of adsorption of hydrogen of palladium is known as
Syneresis
Occlusion
Diffusion
Erosion.

22. Which element is kept in water?
Phosphorus
Sodium
Sulphur
Silicon.

23. Which non-metallic element reacts with dioxygen at room temperature to form its corresponding oxide?
Carbon
Phosphorus
Sulphur
Nitrogen.

24. In order to get ruby coloured glass which of the following compound should be added to glass mix?
Gold (III) chloride
Cobalt (II) oxide
Strontium chloride
Soft ordinary glass.

25. Which type of elements form ionic hydrides?
Transition elements
Metalloids
Elements with high electronegativity
Elements with high electropositivity.

26. Which of the following gas is lightest?
Dihydrogen
Helium
Dinitrogen
Dioxygen

27. Which isotope of hydrogen is/are radioactive in nature?
Protium and deuterium
Tritium only
Tritium and deuterium
Only deuterium.

28. Pick up the false statement about boric acid
Boric acid contains three OH groups per molecule.
Boric acid molecules are associated through H-bonds.
It is a tribasic acid.
It behaves as monobasic acid.

29. In diborane the number of B ?.. H ?? B bonds per molecules isThree
Three
One
Two
None of these.

30. Which is not applicable to borax?
It is used as flux in soldering
It contains five B-O-B bonds
It is used in charcoal cavity test
It is obtained from tincal ore.

31. Which of the following is not a use of borax?
It is used in charcoal cavity test of qualitative analysis
It is used as flux in soldering
It is used in preparing medicinal soap
It is used in preparation of pyrex glass.

32. Which of the following exists as tetra-atomic molecule?
Black phosphorus
Yellow phosphorus
Both (a) and (b)
Nitrogen.

33. Saturated hydrides of silicon are called
Silanes
Silicates
Siloxanes
Silicones.

34. Which pair of species exist as monoatomic molecules?
Helium and argon
Argon and chlorine
Hydrogen and helium
Ozone and nitrogen.

35. Chemical name of phosgene is
Carbonyl chloride
Nitrosyl chloride
Phosphine
Phosphoryl chloride.

36. Which is wrongly matched.
Tritolyl phosphate-petrol additive
Tri-n-bulyl phosphate-wax
Triethyl phosphate-insecticide
Triphenyl phosphate-plasticizers

37. A small iodine crystal is added to each of the following aqueous solutions I (sodium sulphate) II (sodium thiosulphate) III (sodium tetrathionate and IV (sulphuric acid). In which solution the purple colour disappears..
Only in I
I and III
Only in III
III and IV

38. Which of following substance contains magnesium as well as silicon?
Feldspar
Cryolite
Asbestos
Mica.

39. In general the boron trihalides act as.
Strong reducing agent
Lewis acids
Lewis bases
Dehydrating agents

40. Carborundum is a very hard substance (only next to diamond in hardness) is mainly a.
nitride of silicon
zirconide of silicon
boride of silicon
carbide of silicon

41. Which compound of boron is used as a mild antiseptic for washing of eyes under the name boric lotion?.
Sodium borate
Boric acid
Borax
Sodium metaborate

42. Oleum is also called.
Peroxydisulphuric acid
Caros acid
Fuming sulphuric acid
Magic acid

43. Which of the following does not contain silicon element.
Quartz
Kaolinite
Asbestos
Fluorapatite.

44. Orthoboric acid on dehydration at 373 K produces mainly.
metaboric acid
boric anhydride
boron metal and oxygen
pure boric acid

45. Borax bead test is applicable to coloured salt because coloured salts.
are very unstable
are highly stable
form coloured metaborates
decolorize during the test

46. The variety of glass that is used for the manufacture of optical instruments is
Sodium glass
Flint glass
Ground glass
Quartz.

47. The main impurities present in commercial iodine are ICl IBr ICN etc. Which of the following reagent is generally used for its purification..
Sodium thiosulphate
Potassium bisulphate
Potassium iodide
Potassium iodate

48. Which of the following statement s correct?.
Copper (I) metaborate is colourless
Copper (II) metaborate is colourless
Copper (II) metaborate is light green
Copper (I) metaborate is dark green

49. When iron (III) compounds are added to glass mix which colour is imparted to it
Brown
Blue
Green
Pink.

50. Which out of potassium ion fluoride ion and ammonia molecule can form co-ordinate bond with boron trifluoride?
Only ammonia
Ammonia and fluoride ion
All the three
Only fluoride ion