Chemistry Solved Questions and Answers Set 23

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Q.1:- The formula of Haematite is ?

  1. Fe3O4
  2. Fe2O3
  3. FeCO3
  4. FeS2

Q.2:- Iron is rendered passive by treatment with ?

  1. HNO3
  2. H2SO4
  3. HCl
  4. H3PO4

Q.3:- Parke’s process is used ?

  1. To extract Cu using CuFeS2
  2. To extract Ag from Argentiferous Lead
  3. To extract Ag by forming Amalgam
  4. To extract Ag using NaCN

Q.4:- Which of the following is highly corrosive salt ?

  1. FeCl2
  2. HgCl2
  3. PbCl2
  4. Hg2Cl2

Q.5:- In the ordinary fire extinguisher, Carbon Dioxide is generated by the reaction of ? [BSSC Exams 2015]

  1. Sodium Carbonate and Dilute HCL
  2. Sodium Bicarbonate and Dilute H2SO4
  3. Limestone and Dilute H2SO4
  4. Marble powder and Dilute HCl

Q.6:- Number of water molecules present in Mohr’s salt is ?

  1. 4
  2. 5
  3. 6
  4. 8

Q.7:- Which gas is evolved when H2O2 reacts with Chlorine ?

  1. H2
  2. O2
  3. ClO2
  4. None of the above

Q.8:- An aqueous solution of Borax is ?

  1. Corrosive
  2. Neutral
  3. Acidic
  4. Alkaline

Q.9:- Alum is water purifier because it ?

  1. Gives taste
  2. Softens hard water
  3. Coagulates the impurities
  4. Destroys the pathogenic bacteria

Q.10:- Boron halides behave as Lewis base, because of their ?

  1. Electron deficient nature
  2. Acidic nature
  3. Ionic nature
  4. Covalent nature
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Q.11:- The reducing agent in thermite process is ?

  1. Mg
  2. BaO2
  3. Al
  4. MnO2

Q.12:- The Ultraviolet Rays can be checked by ?

  1. Flint Glass
  2. Crooke’s Glass
  3. Soda Glass
  4. Pyrex Glass

Q.13:- Which of the following is an important constituent of transistors ?

  1. Pb
  2. Os
  3. Sn
  4. Ge

Q.14:- Percentage of Lead in Lead pencil is ?

  1. Zero
  2. 20
  3. 40
  4. 80

Q.15:- Aqua-Regia is a mixture of ?

  1. 3HCl + HNO3
  2. H3PO4 + H2SO4
  3. 3HNO3 + HCl
  4. HCl + CH3COOH

Q.16:- Red Phosphorous is less reactive than yellow phosphorous because ?

  1. It is red in colour
  2. It is highly polymerised
  3. It is insoluble in C2H5OH
  4. It is hard

Q.17:- Stannous fluoride is formed by ?

  1. Sn + HF
  2. SnO2 + HF
  3. Sn + F
  4. SnO + HF

Q.18:- Elements showing maximum inert pair effect is ?

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

Q.19:- The mixture of White and Red Phosphorous can be separated by using ?

  1. Kerosene
  2. Iodine
  3. NaOH
  4. HNO3

Q.20:- Sea weeds are important source of ?

  1. F2
  2. Cl2
  3. Br2
  4. I2

Q.21:- Chlorine is manufactured by ?

  1. Birkeland and Eyde Process
  2. Deacon’s Process
  3. Bosch Process
  4. Solvay’s Process

Q.22:- When water is electrolysed, then which of the following is formed ?

  1. D2O
  2. O2
  3. H2
  4. Both (B) and (C)
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Q.23:- The non-metal found in the liquid state is ?

  1. Bromine
  2. Nitrogen
  3. Fluorine
  4. Chlorine

Q.24:- The mixture of concentrated HCl and HNO3 made in 3:1 ratio contains ?

  1. N2O4
  2. NOCl
  3. NCl3
  4. ClO2

Q.25:- Which of the following noble gases has the largest Vander Waal’s radius ?

  1. Xe
  2. Kr
  3. Ne
  4. Ar

 

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