Chemical Bonds for Dummies. We covered all the Chemical Bonds for Dummies MCQ in this post for free so that you can practice well for the exam.
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MCQ on Chemicals Bonds for Dummies for Students
Which of the following gases can be used for the storage of fresh samples of oil for a long time?
(a) Carbon dioxide or oxygen
(b) Nitrogen or Oxygen
(c) Carbon dioxide or helium
(d) Helium or nitrogen
Option d – Helium or nitrogen
Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by the liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed? A. It is an endothermic reaction B. It is an exothermic reaction C. The pH of the resulting solution will be more than seven The pH of the resulting solution will be less than seven
(a) A and B
(b) B and C
(c) A and D
(d) C and D
Option b – B and C
What type of chemical reaction occurs? Mg(s) + 2HCl (aq) → MgCl₂(aq) + H₂(g)
(a) Combination reaction
(b) Neutralisation reaction
(c) Displacement reaction
(d) Decomposition reaction
Option c – Displacement reaction
On the basis of the following features identify the correct option A. A substance breaks down into simpler substances B. Electrolysis of water is an example of this type of reaction.
(a) Electrolytic decomposition
(b) Thermal decomposition
(c) Photochemical decomposition
(d) Catalytic decomposition
Option a – Electrolytic decomposition
On the basis of the following features identify the correct option A. The reaction occurs during corrosion B. This reaction occurs during respiration.
(a) Combustion reaction
(b) Redox reaction
(c) Oxidation reaction
(d) Exothermic reaction
Option b – Redox reaction
Take about 1.0g CaCO3 in a test tube. Heat it over a flame, when a colourless gas comes out. The reaction is called an
(a) decomposition reaction
(b) displacement reaction
(c) double decomposition reaction
(d) double displacement reaction
Option a – decomposition reaction
Which of the following options is true?
(a) Ammonia and hydrogen chloride react to form ammonium hydroxide
(b) Removal of hydrogen from a compound is an example of reduction
(c) The reaction FeS + H₂SO4 → FeSO4 + H₂S, is an example of a double displacement reaction
(d) A matchstick gets ignited when inserted in the blue flame of a candle
Option c – The reaction FeS + H₂SO4 → FeSO4 + H₂S, is an example of a double displacement reaction
Oxygen gas reacts with hydrogen to produce water. The reaction is represented by the equation: O₂ (g) + H₂(g) → H₂O (g) The above reaction is an example of A. Oxidation of hydrogen B. Reduction of oxygen C. Reduction of hydrogen D. Redox reaction
(a) A, B and C
(b) B, C and D
(c) A, C and D
(d) A, B and D
Option d – A, B and D
Consider the following statements and select the correct code. Assertion (A): A chemical reaction becomes faster at higher temperatures. Reason (R): At higher temperatures, molecular motion. becomes more rapid. Codes :
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Option a – Both A and R are true and R is the correct explanation of A.
Which of these is NOT balanced correctly?
(a) Mg + H₂O → Mg(OH)₂ + H₂
(b) 2AlCl3 + 3Ca(OH)₂ → 2Al(OH)3 + 3CaCl₂
(c) 2KCIO3 → 2KCl+30₂
(d) 2Al+ 3H₂SO4 → Al2(SO4)3 + 3H₂
Option a – Mg + H₂O → Mg(OH)₂ + H₂
Which of the following chemical reactions is balanced and also undergoes combustion?
(a) C3Hg +50₂ → 3CO₂ + 4H₂O
(b) 6CO₂ + 12H₂O2 → C6H1₂O6 +60₂ + 6H₂O
(c) C3H6+40₂ → 3CO₂ + 3H₂O
(d) 2Al + 3H₂SO4 → Al2(SO4)3 + 3H₂
Option a – C3Hg +50₂ → 3CO₂ + 4H₂O
Which of the following chemical equations best describes the formation of rust?
(a) 4Fe +30₂ + xH₂O →2Fe₂O3 xH₂O
(b) Fe + H₂SO4 → FeSO4+H₂
(c) 2Fe3O4+H₂O →3 Fe₂ O3 + H₂
(d) 2FeSO4 → Fe₂O3 + SO₂ + SO3
Option a – 4Fe +3O₂ + xH₂O →2Fe₂O3 xH₂O
Which of the following is a combination of reducing agents?
(a) LiAlH4, KMnO4
(b) LiAlH4, NaBH4
(c) K₂Cr₂O7, NaBH4
(d) LiAlH4, K₂Cr₂O7
Option b – LiAlH4, NaBH4
The fermentation of grapes to make wine is an example of
(a) Displacement reaction
(b) Decomposition reaction
(c) Double displacement reaction
(d) Combination reaction
Option b – Decomposition reaction
The increasing order of reactivity with acids of the following metal (Zn, H₂, Pt, Sn, Cd) is
(a) Pt <H₂ < Sn <Cd < Zn
(b) Pt <H₂ <Cd < Sn< Zn
(c) Pt <H₂ <Cd <Zn < Sn
(d) H₂ <Pt < Cd < Sn<Zn
Option a – Pt
The substance which gives ……… is called an oxidizing agent. The substance which removes ………. is called a reducing agent.
(a) oxygen, hydrogen
(b) oxygen, oxygen
(c) hydrogen, oxygen
(d) oxygen, hydrogen peroxide
Option b – oxygen, oxygen
Two test tubes ‘A’ and ‘B’ contain an aqueous solution of potassium iodide and lead nitrate separately. When these two test tubes ‘A’ and ‘B’ are mixed with each other, resulting in ‘X’ and ‘Y’. The ‘X’ and ‘Y’ are :
(a) Yellow ppt, yellow solution
(b) Yellow ppt, colourless solution
(c) White ppt, yellow solution
(d) White ppt, colourless solution
Option b – Yellow ppt, colourless solution
Hydrogen sulphide (H₂S) is a strong reducing agent. Which of the following reactions shows its reducing action
(a) Cd(NO3)2 + H₂S → CdS+ 2HNO3
(b) CuSO4+H₂S → CuS+H₂SO4
(c) 2FeCl3 + H₂S → 2FeCl₂ + 2HCI+S
(d) Pb(NO3)2 + H₂S → PbS+2CH3COOH
Option c – 2FeCl3 + H₂S → 2FeCl₂ + 2HCl+S
When washing soda is treated with hydrochloric acid, it gives off colourless gas with a lot of effervescence then that gas is
(a) CO₂
(b) O2
(c) CO
(d) Cl₂
Option a – CO₂
Copper on exposure to air reacts with moisture and CO2 to develop a green layer which is chemically
(a) basic copper carbonate
(b) copper sulphate
(c) copper carbonate
(d) copper nitrate
Option a – basic copper carbonate
How is the decomposition of silver chloride carried out?
(a) By Electricity
(b) By sunlight
(c) By heat
(d) By water
Option b – By sunlight
Which of the given reactions is a compound-compound combination reaction? ( Chemical Bonds for Dummies )
(a) The reaction of water with calcium oxide.
(b) The reaction of iodine with white phosphorus.
(c) The reaction of iron with sulphur.
(d) Electrolysis of water.
Option a – The reaction of water with calcium oxide
Which of the following statements is correct for the given reaction? 10HNO3 +I2 → 2HIO3 + 10NO₂ + 4H₂O
(a) I₂ is an oxidant
(b) I₂ is reduced
(c) HNO3 is oxidised
(d) HNO3 is reduced
Option d – HNO3 is reduced
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