Chemistry Solved Questions and Answers Set 40

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Q.1:- In the blast furnace, Iron Oxide is reduced by ?

  1. Carbon
  2. Carbon Monoxide
  3. Silica
  4. Hot Blast Air

Q.2:- When metal is obtained in molten state from its ore, the process may be called ?

  1. Rusting
  2. Smelting
  3. Calcination
  4. Thermal Dissociation

Q.3:- Aluminium salt commonly used to stop bleeding is ? [SSC Exam 2015]

  1. Aluminium Chloride
  2. Aluminium Nitrate
  3. Aluminium Sulphate
  4. Potash Alum

Q.4:- Annealing process is ?

  1. Heating the steel bright red and then cooling slowly
  2. Heating the steel to a temperature much below redness and cooling it slowly
  3. Beating rods of Iron embedded in charcoal powder
  4. Heating steel to bright red and cooling suddenly

Q.5:- Which one among the following is used in making gunpowder ? [NDA Exam 2015]

  1. Magnesium Sulphate
  2. Potassium Nitrate
  3. Sodium Stearate
  4. Calcium Sulphate

Q.6:- The name Hydrogen was proposed by ?

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

Q.7:- Electromagnetic wave coming out of the nucleus of a natural radioactive atom is ? [SSC Exam 2013]

  1. Alpha Ray
  2. Beta Ray
  3. Gamma Ray
  4. Microwave

Q.8:- Living in the atmosphere of CO is dangerous because it ?

  1. Reduces organic matter of tissues
  2. Dried up the blood
  3. Combined with O2 present inside the form CO2
  4. Combines with haemoglobin and makes it incapable of absorbing Oxygen

Q.9:- Which gas emitted by power stations causes acid rain ? [SSC Exam 2015]

  1. Helium
  2. Carbon Dioxide
  3. Nitrogen
  4. Sulphur Dioxide

Q.10:- Which one of the following gases has colour ? [SSC Exam 2015]

  1. Oxygen
  2. Chlorine
  3. Hydrogen
  4. Nitrogen
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Q.11:- Which one of the following elements is allowed with Iron to produce steel which can resist high temperatures and also have high hardness and abrasion resistance ? [IAS Exam 1996]

  1. Aluminium
  2. Chromium
  3. Nickel
  4. Tungsten

Q.12:- The percentage of Nitrogen in Ammonium Sulphate is ? [SSC Exam 2013]

  1. 18%
  2. 21%
  3. 25%
  4. 5%

Q.13:- Which one of the following statements about PYROLYSIS, which is a process for solid waste treatment is incorrect ? [SSC Exam 2013]

  1. The process occurs under high pressure at temperature above 430 deg. C.
  2. It is a thermochemical decomposition of organic waste
  3. It converts the waste into solid, liquid and gas of which the resultant liquid and gas can be used to produce energy
  4. The process occurs at a temperature above 430 deg. C at atmospheric pressure

Q.14:- Which of the following is used as new material for the manufacture of Rayon ? [SSC Exam 2015]

  1. Coal
  2. Petroleum
  3. Cellulose
  4. Plastic

Q.15:- An example of Heterocyclic compound is ? [SSC Exam 2013]

  1. Benzene
  2. Anthracene
  3. Naphthalene
  4. Furan

Q.16:- Which one of the following is the correct sequence in increasing order of molecular weight of the Hydrocarbon ? [IAS Exam 2001]

  1. Methane, Ethane, Propane and Butane
  2. Propane, Butane, Ethane, and Methane
  3. Butane, Ethane, Propane and Methane
  4. Butane, Propane, Ethane and Methane

Q.17:- Most of the explosions in mines occur due to the mixing of ? [IAS Exam 2000]

  1. Hydrogen with Oxygen
  2. Oxygen with Acetylene
  3. Methane with Air
  4. Carbon Dioxide with Ethane
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Q.18:- Which one of the following has the highest fuel value ? [IAS Exam 1997]

  1. Hydrogen
  2. Charcoal
  3. Natural Gas
  4. Gasoline

Q.19:- Example of covalent bond is ? [RRB Allahabad Exam 2005]

  1. KCl
  2. BaO
  3. CHCl3
  4. CaH2

Q.20:- Which one of the following has largest size ? [MP PMT Exam 1998]

  1. C4
  2. N-3
  3. O-2
  4. F

Q.21:- Ideal solution is formed when its components ?

  1. Have zero heat of mixing only
  2. Have zero volume change on mixing only
  3. Have zero heat of mixing and zero volume change
  4. Can be converted into gases

Q.22:- The decomposition of H2O2 is retarded by phosphoric acid. Thus phosphoric acid acts as ?

  1. Negative Catalyst
  2. Positive Catalyst
  3. Induced Catalyst
  4. Auto Catalyst

Q.23:- Chemical formula of common salt is ? [JSS Exam 2015]

  1. H2O
  2. NaCl
  3. KCl
  4. HCl

Q.24:- Which one of the following is known as Salt Peter ? [CDS Exam 2005]

  1. NaCl
  2. KNO3
  3. Na2CO3
  4. NaHCO3

Q.25:- The inert gas used as Beacon light is ? [SSC (CGL) Exam 2014]

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


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