Chemistry Solved Questions and Answers Set 29

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

Q.1:- A bond formed by sharing of electrons between atoms of the elements is called ?

  1. Ionic Bond
  2. Covalent Bond
  3. Co-ordinate Bond
  4. None of the above

Q.2:- A radioactive substance has a half-life of four months. Three-fourth of the substance would decay in ?

  1. 3 months
  2. 4 months
  3. 8 months
  4. 12 months

Q.3:- Formation of cation occurs by ?

  1. Gain of electron
  2. Loss of electron
  3. Gain of proton
  4. Loss of proton

Q.4:- What is neuron ? [SSC Exam 2013]

  1. The anti-particle of neutron
  2. Basic unit of nervous system
  3. Basic unit of energy
  4. Particle released during radioactivity

Q.5:- “Yellow Cake” an item of smuggling across border is ? [IAS Exams 1995]

  1. A crude from of Heroin
  2. A crude form of cocaine
  3. Uranium Oxide
  4. Unrefined gold

Q.6:- A base is a substance which ?

  1. Donates electrons
  2. Accepts proton
  3. Gives OH– ions in water
  4. All of the above

Q.7:- The mass of 6.02 x 1023 molecules of CO is ?

  1. 28g
  2. 14g
  3. 0g
  4. 56g
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Q.8:- Source of Vitamin C is ?

  1. Nitric Acid
  2. Ascorbic Acid
  3. Oxalic Acid
  4. Maleic Acid

Q.9:- An intensive property in thermodynamics means a property which depends ?

  1. On the amount of the substance only
  2. On the nature of the substance only
  3. Both on the amount as well as nature of the substance
  4. Neither on the amount nor on the nature

Q.10:- An example of an autocatalytic reaction is ?

  1. Hydrogenation of Oil
  2. Decomposition of Nitroglycerine
  3. Oxidation of Na2AsO3 in presence of Na2SO3
  4. Thermal decomposition of KClO3 in presence of MnO2

Q.11:- When ammonium chloride is dissolved in water, the solution becomes cold. The change is ?

  1. Endothermic
  2. Exothermic
  3. Supercooling
  4. None of these

Q.12:- Which one is known as father of periodic table ?

  1. Lavoisier
  2. Rutherford
  3. Mendeleev
  4. Bohr

Q.13:- Octane number of fuel can be increased by ?

  1. Isomerisation
  2. Alkylation
  3. Reforming
  4. All of the above

Q.14:- The standard state in chemical energetics implies ?

  1. 1 atm pressure at 273 K
  2. 1 atm pressure at 298 K
  3. 1 Bar pressure at 298 K
  4. 1 Bar pressure at specified temperature
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Q.15:- In modern periodic table, the number of period is ?

  1. 2
  2. 6
  3. 7
  4. 8

Q.16:- When a gas is subjected to adiabatic expansion, it gets cooled due to ?

  1. No change in entropy
  2. Loss in kinetic energy
  3. Decrease in velocity
  4. Energy spent in doing work

Q.17:- The elements with atomic numbers 2, 10, 18, 36, 54 and 86 are all ?

  1. Inert Gas
  2. Light Metals
  3. Halogens
  4. Rare Earth Metals

Q.18:- Which of the following is the smallest cation ? [Raj. PMT Exam 1998]

  1. Na+
  2. Mg2+
  3. Li+
  4. Be++

Q.19:- Transition metals are often paramagnetic owing to ?

  1. High M.P. and B.P.
  2. The presence of vacant orbitals
  3. The presence of unpaired electrons
  4. Malleability and ductility

Q.20:- Faraday constant ?

  1. Depends on equivalent
  2. Is a numerical constant
  3. Depends on the number of electrons
  4. Depends upon the current passed
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Q.21:- The number of mole of solute per kilogram solvent is called ?

  1. Molarity
  2. Molality
  3. Normality
  4. None of the above

Q.22:- Use of electrolysis is ?

  1. Electroplating
  2. Electro-Refining
  3. Both (A) and (B)
  4. None of the above

Q.23:-  Alum purifies muddy water by ?

  1. Absorption
  2. Dialysis
  3. Emulsifying properties
  4. Coagulation

Q.24:- Cod liver is an example of ?

  1. Oil emulsion
  2. Oil in water emulsion
  3. Water in oil emulsion
  4. Water in water emulsion

Q.25:- Reverse of swelling of gel is known as ?

  1. Syneresis
  2. Thixotropy
  3. Sorption
  4. None of the above

 

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