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Mixed Test (Chemistry)

Engineering entrance

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Aniline reacts with acetic anhydride to form acetanilide. This reaction is known as ____________.

  1. Schotten Baumann reaction
  2. Ullmann reaction
  3. Gomberg reaction
  4. Sandmeyer reaction
  5. None of these
Question 2 Multiple Choice (Single Answer)

The chemical reagent used for leaching of gold and silver ores is

  1. sodium hydroxide
  2. potassium cyanide
  3. sodium thiosulphate
  4. sodium bicarbonate
  5. none of these
Question 3 Multiple Choice (Single Answer)

The reaction of aqueous potassium permanganate with hydrogen peroxide in acidic condition gives

  1. Mn+4 and O2
  2. Mn+2 and O2
  3. Mn+3 and O3
  4. Mn+3 and MnO4
  5. None of these
Question 4 Multiple Choice (Single Answer)

By which of the following reactions can gold sol be prepared?

  1. Hydrolysis of gold(III) chloride
  2. Oxidation of gold by aqua regia
  3. By peptization
  4. Reduction of gold (III) chloride formalin solution
  5. None of these
Question 5 Multiple Choice (Single Answer)

The yellow litharge is prepared by _________.

  1. massicoto
  2. red lead
  3. mosaic gold
  4. only 1 and 2
  5. none of these
Question 6 Multiple Choice (Single Answer)

Which of the following statements is not correct about the interhalogen properties?

  1. They are all covalent compound.
  2. They are volatile solid or liquid except ClF.
  3. IF5 has square pyramidal structure.
  4. They are paramagnetic in nature.
  5. None of these
Question 7 Multiple Choice (Single Answer)

The number of electrons that are involved in the reduction of permanganate to manganese (II) salt, manganate and manganese dioxide respectively are __________.

  1. 5, 1 and 3
  2. 5, 3 and 1
  3. 2, 7 and 1
  4. 2, 3 and 1
  5. None of these
Question 8 Multiple Choice (Single Answer)

Which of the following species is/are isoelectronic?
(1) NH3

(2) CH3+

(3) NH2-

(4) NH4+

  1. Only (1), (2) and (3)
  2. Only (2), (3) and (4)
  3. Only (1), (2) and (4)
  4. Only (1), (3) and (4)
  5. None of these
Question 9 Multiple Choice (Single Answer)

Which of the following is the chemical formula of butter tin?

  1. SnCl4.5H2O
  2. SnCl6(NH4)2
  3. SnS2
  4. SnO2
  5. None of these
Question 10 Multiple Choice (Single Answer)

In acidic medium, hydrogen peroxide changes Cr2O72- to CrO5, which has two (-O-O-) bonds. The oxidation state in CrO5 is

  1. +1
  2. +3
  3. +6
  4. -5
  5. None of these
Question 11 Multiple Choice (Single Answer)

When the plaster of Paris is heated above 2000C, it is converted into ____________.

  1. dead burnt
  2. epsom salt
  3. milk of magnesia
  4. hydrolith
  5. none of these
Question 12 Multiple Choice (Single Answer)

Magnesia alba is obtained by the addition of ____________.

  1. MgCO3 and MgSO4.7H2O
  2. CaCO3 and H2O
  3. AgCl and HNO3
  4. MgCl2 and MgO
  5. None of these
Question 13 Multiple Choice (Single Answer)

Potassium dichromate belongs to ____________ crystal system.

  1. tetrahedral
  2. orthorhombic
  3. triclinic
  4. only 1 and 2
  5. none of these
Question 14 Multiple Choice (Single Answer)

Which of the following statements is incorrect?

  1. Ozone oxidises lead sulphide to lead sulphate.
  2. Ozone oxidises nitric oxide to nitrogen dioxide.
  3. Two oxygen-oxygen bond length in ozone are different.
  4. Options 1 and 2 correct
  5. None of these
Question 15 Multiple Choice (Single Answer)

Permanent hardness of water can be removed by _____________.

  1. sodium sulphate
  2. sodium bicarbonate
  3. washing soda
  4. sodium chloride
  5. none of these
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