Chemistry Solved Questions and Answers Set 13

January 25, 2019 entranciology Chemistry Solved Questions and Answers Sets, Solved Questions and Answers Sets For Competitive Exams 0

Q.1:- The geometry of CCl4 is ?

  1. Tetrahedral
  2. Triangular
  3. Linear
  4. Octahedral

Q.2:- H2O is liquid and H2S is a gas because ?

  1. Oxygen forms stronger hydrogen bond than sulphur
  2. Oxygen is less electronegative than sulphur
  3. Atomic radius of Oxygen is less than that of sulphur
  4. Atomic radius of oxygen is greater than that of sulphur

Q.3:- Oxidation state of Nitrogen in N3H is ?

  1. +1/2
  2. +3
  3. -1
  4. -1/2

Q.4:- Blue litmus paper is converted into red in solution of ?

  1. Acid
  2. Base
  3. Alkali
  4. Salt

Q.5:- Sulphuric acid is ?

  1. Monobasic
  2. Dibasic
  3. Tribasic
  4. Tetrabasic

Q.6:- The rate of diffusion of Hydrogen is about ?

  1. One half that of Helium
  2. 4 times that of Helium
  3. Twice that of Helium
  4. Four times that of Helium

Q.7:- The element common to all acids is ?

  1. Hydrogen
  2. Nitrogen
  3. Sulphur
  4. Oxygen

Q.8:- By what factor is a solution with pH = 2 more acidic than one with pH = 6 ?

  1. 4
  2. 12
  3. 400
  4. 104
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Q.9:- The boiling point of water decreases at higher altitudes is due to ?

  1. Low temperature
  2. Low atmospheric pressure
  3. High temperature
  4. High atmospheric pressure

Q.10:- Which is not a colligative properties ?

  1. Osmotic pressure
  2. Relative lowering of vapour pressure
  3. Depression in freezing point
  4. Refraction index

Q.11:- Molten Sodium Chloride conducts electricity due to the presence of ?

  1. Free molecules
  2. Free electrons
  3. Free ions
  4. Atoms of Sodium and Chlorine

Q.12:- In galvanization, Iron is coated with ?

  1. Copper
  2. Zinc
  3. Tin
  4. Nickel

Q.13:- Water is non-electrolyte but conducts electricity on dissolving a small amount of ?

  1. Sugar
  2. Urea
  3. Common Salt
  4. Acetone

Q.14:- If the dispersed phase is a liquid and the dispersion medium is solid, the colloid is known as ?

  1. Foam
  2. Sol
  3. Emulsion
  4. Gel
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Q.15:- Which factor effects adsorption ?

  1. Temperature
  2. Surface Area
  3. Pressure
  4. All of these

Q.16:- The forth floatation process is used for the concentration of ?

  1. Oxide Ores
  2. Sulphide Ores
  3. Halide Ores
  4. Silicate Ores

Q.17:- When ore is heated generally in presence of air, then process is called ?

  1. Smelting
  2. Roasting
  3. Calcination
  4. None

Q.18:- In blast furnace, Iron Oxide is reduced by ?

  1. Silica
  2. CO
  3. C
  4. Lime Stone

Q.19:- Which of the following metals do not form amalgam ?

  1. Zinc
  2. Copper
  3. Magnesium
  4. Iron

Q.20:- Reduction of oxide with carbon at high temperature is called ?

  1. Calcination
  2. Smelting
  3. Roasting
  4. None

Q.21:- Rocky impurities present in a mineral are called ?

  1. Flux
  2. Gangue
  3. Matte
  4. Slag

Q.22:- Which of the following alkaline earth metals has the highest ionic mobility in an aqueous solution ?

  1. Ba2+
  2. Mg2+
  3. Ca2+
  4. Be2+
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Q.23:- Why are stainless steel cooking pans fabricated with copper bottom ?

  1. Copper is cheaper
  2. Conductivities of copper is more than the stainless steel
  3. Copper increases durability of the cooking pan
  4. Copper is a good reflector of heat

Q.24:- Cadmium is almost found in the ore of ?

  1. Gold
  2. Silver
  3. Aluminium
  4. Zinc

Q.25:- The metal used in incandescent lamps is ?

  1. Mo
  2. Pt
  3. W
  4. Cr

 

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