Chemistry Solved Questions and Answers Set 26

February 8, 2019 entranciology Chemistry Solved Questions and Answers Sets, Solved Questions and Answers Sets For Competitive Exams 0

Q.1:- The process of converting Hydrate Al2O3 into anhydrous aluminium is known as ?

  1. Smelting
  2. Roasting
  3. Calcination
  4. Dressing

Q.2:- The salt which is least likely to be found in minerals is ?

  1. Chloride
  2. Sulphide
  3. Nitrate
  4. Sulphide

Q.3:- Silver metal is obtained by ?

  1. Parke’s process
  2. Froth floatation process
  3. Carbon reduction process
  4. Magnetic separation

Q.4:- Salts of which of the following elements provide colours to fireworks ? [IAS Exams 2004]

  1. Zinc and Sulphur
  2. Potassium and Mercury
  3. Strontium and Barium
  4. Chromium and Nickel

Q.5:- Calcination is the process of heating the ore ?

  1. In a blast furnace
  2. In absence of air
  3. In presence of air
  4. None of the above

Q.6:- Gypsum is used for improvement of ? [SSC Exam 2013]

  1. Podsols
  2. Acidic Soils
  3. Alkaline Soils
  4. Saline Soils
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Q.7:- Beryl is an important mineral of ?

  1. Lithium
  2. Magnesium
  3. Beryllium
  4. Calcium

Q.8:- Lunar caustic is ?

  1. NaOH
  2. NaNO3
  3. AgNO3
  4. Ag2SO4

Q.9:- Which is most active metal among the following ?

  1. Al
  2. Cu
  3. Ni
  4. Pb

Q.10:- Important ore of Mg is ?

  1. Magnatite
  2. Carnotite
  3. Gypsum
  4. Carnallite

Q.11:- Gold dissolves in aqua regia to produce ?

  1. AuCl4
  2. HAuCl4
  3. HAuCl3
  4. [Au(CN)2]

Q.12:- The paramagnetic character of the metals is due to ?

  1. Completely filled orbitals
  2. Unpaired electrons
  3. Variable valency
  4. Low melting and boiling point

Q.13:- Spathic ore is ?

  1. Fe2O3.3H2O
  2. FeCO3
  3. Fe3O4
  4. Fe2O3

Q.14:- Purest form of Iron is ?

  1. White cast Iron
  2. Grey cast Iron
  3. Wrought Iron
  4. Steel
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Q.15:- Which one of the following elements is an example of noble gas ? [SSC Exam 2014]

  1. Nitrogen
  2. Hydrogen
  3. Chlorine
  4. Helium

Q.16:- Water softening by Clarke’s process uses ?

  1. Potash Alum
  2. Calcium Bicarbonate
  3. Calcium Hydroxide
  4. Sodium Bicarbonate

Q.17:- Lead pencil contains ?

  1. Pb
  2. FeS
  3. Graphite
  4. PbS

Q.18:- The chemical used as a fixer / developer in photography is ? [NDA Exam 2015]

  1. Sodium Sulphate
  2. Sodium Sulphide
  3. Sodium Thiosulphate
  4. Sodium Sulphite

Q.19:- Emery consists of impure ?

  1. Iron
  2. Corundum
  3. Carborundum
  4. Graphite

Q.20:- The process of slow and homogeneous cooling of glass is called ?

  1. Etching of glass
  2. Annealing of glass
  3. Enamelling of glass
  4. Denitrification of glass

Q.21:- The compound used as refrigerant is ?

  1. CF4
  2. CCl4
  3. CCl2F2
  4. COCl2
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Q.22:- Which of the following show electrical conductance ?

  1. Sodium
  2. Potassium
  3. Graphite
  4. Diamond

Q.23:- Super Phosphate of lime contains ?

  1. Ca3(PO4)2
  2. CaHPO4
  3. H3PO4 + Ca3(PO4)2
  4. Ca(H2PO4)2

Q.24:- Ozone is an _____ of Oxygen ?

  1. Isomer
  2. Isotope
  3. Allotrope
  4. Isomorphism

Q.25:- SO2 is not a ?

  1. Basic Oxide
  2. Bleaching Agent
  3. Disinfectant
  4. Reducing Agent

 

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