Chemistry - MOST IMPORTANT Executive Electrical Previous Year Questions
Practice real questions from previous year exams of Executive Electrical.
📘 Acids, Bases and Salts📚 Misc
Q1
Which of the following compounds is a base?
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📘 Organic Chemistry📚 Soaps and Detergents
Q2
Read the given statements carefully and select the correct option.
Statement-I: The clusters of molecules in which the hydrophobic tails are in the interior of the cluster and the ionic ends are on the surface of the cluster are called micelles.
Statement-II: The micelles stay in solution as a colloid and will not come together to precipitate because of ion-ion repulsion.
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📘 Chemical Reactions📚 Decomposition Reaction
Q3
In the decomposition of lead nitrate (Pb(NO3)2), which of the following pairs of gases is released?
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📘 Laws of Chemical Combinations📚 Laws of Conservation of Mass
Q4
When 50 g of silver nitrate solution is mixed with 30 g of sodium chloride solution, a white precipitate of silver chloride forms along with sodium nitrate in the solution. What will the total mass of the products be?
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📘 Acids, Bases and Salts📚 Chemical Properties of Acids
Q5
When a metal carbonate reacts with an acid what are the products formed?
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📘 Atomicity📚 Triatomic
Q6
Ozone, which forms the protective layer around the surface of the earth, is made up of ______ atom(s) of oxygen.
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📘 Important Chemical Compounds📚 Baking Soda
Q7
Which of the following chemicals can be obtained from sodium chloride?
I. Baking soda
II. Washing soda
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📘 Periodic Table📚 Modern Periodic Table
Q8
Which of the following statements is/are correct regarding the Modern Periodic Table?
I. Properties of elements are a periodic function of their atomic mass.
II. The Modern Periodic Table has 18 vertical columns known as 'groups' and 7 horizontal rows known as 'periods'.
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📘 Periodic Table📚 Newland Law of Octaves
Q9
The 'Law of Octaves' was proposed by____.
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📘 Pure Substance- Element-Classification of Matter on the basis of Chemical Properties- II📚 Non-metals and its properties
Q10
____ is an essential element used in the synthesis of proteins.
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📘 Chemical Reactions📚 Combination Reaction
Q11
Burning of coal is an example of ____ reaction.
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📘 Environmental Chemistry📚 Acid Rain
Q12
Which of the following statements is/are correct regarding fossil fuels?
I. The fossil fuels are renewable sources of energy.
II. Burning fossil fuels leads to acid rain.
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📘 Pure Substance- Compound-Classification of Matter on the basis of Chemical Properties- II📚 Ionic Compound
Q13
Assertion (A): Sodium chloride absorbs moisture from the atmosphere when it is kept open.
Reason (R): Sodium chloride hygroscopic nature, forms a brine solution by absorbing water molecules.
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