Test : Chemistry - 4


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20 Questions MCQ Test NDA (National Defence Academy) Mock Test Series | Test : Chemistry - 4

Test : Chemistry - 4 for Defence 2023 is part of NDA (National Defence Academy) Mock Test Series preparation. The Test : Chemistry - 4 questions and answers have been prepared according to the Defence exam syllabus.The Test : Chemistry - 4 MCQs are made for Defence 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test : Chemistry - 4 below.
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Test : Chemistry - 4 - Question 1

The poisonous gas accidentally released in Bhopal Gas Tragedy is -

Detailed Solution for Test : Chemistry - 4 - Question 1

Bhopal gas tragedy occured on the night of 2–3 December 1984 at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh. Over 500,000 people were exposed to methyl isocyanate (MIC) gas and other chemicals leaked from UCIL.

Test : Chemistry - 4 - Question 2

Release of which among the following is the primary reason for depletion of the ozone layer?

Detailed Solution for Test : Chemistry - 4 - Question 2

The Chlorofluro carbon formed by chlorine, fluorine and carbon. They are often used as refrigerants, solvents, and for the manufacture of spongy plastics. It is the primary reason for depletion of the ozone layer.

Test : Chemistry - 4 - Question 3

Which of the following molecules is joined by a double covalent bond?

Detailed Solution for Test : Chemistry - 4 - Question 3

Oxygen atom is joined by double covalent bond.

Test : Chemistry - 4 - Question 4

Which of the following elements has the lowest melting point?

Detailed Solution for Test : Chemistry - 4 - Question 4

Mercury has the lowest melting point. Mercury has a melting point of -37.89F.
 

Test : Chemistry - 4 - Question 5

The common name of sodium bicarbonate is _____.

Detailed Solution for Test : Chemistry - 4 - Question 5

Sodium bicarbonate is commonly known as baking soda. It is a chemical compound with the formula NaHCO3.

Test : Chemistry - 4 - Question 6

Metals react with sodium hydroxide to produce ___________.

Detailed Solution for Test : Chemistry - 4 - Question 6

Sodium hydroxide reacts with metal to release hydrogen gas. The metal takes the oxygen atom from sodium hydroxide, which in turn takes the oxygen atom from the water, and releases the two hydrogen atoms. The reaction thus produces hydrogen gas.

Test : Chemistry - 4 - Question 7

Which base is present in lime water?

Detailed Solution for Test : Chemistry - 4 - Question 7

Calcium hydroxide base is present in lime water.

Test : Chemistry - 4 - Question 8

Rusting is _____.

Detailed Solution for Test : Chemistry - 4 - Question 8

Redox reaction is the reaction in which oxidation and reduction occurs simultaneously. Rust of iron is nothing but hydrate of iron oxide and iron (III) oxide -hydroxide.
 

Test : Chemistry - 4 - Question 9

Which amongst the following is not a Cation?

Detailed Solution for Test : Chemistry - 4 - Question 9

A cation is a positively-charged ion, while an anion is negatively charged. Sulphate is an anion.

Test : Chemistry - 4 - Question 10

Which of the following is not a component of Smog?

Detailed Solution for Test : Chemistry - 4 - Question 10

Smog is a type of air pollutant. It  is composed of nitrogen oxides, sulphur oxides, ozone, smoke or particulates among others (less visible pollutants include carbon monoxide, CFCs and radioactive sources).
 

Test : Chemistry - 4 - Question 11

Which gas is known as ‘noble gas”? 

Detailed Solution for Test : Chemistry - 4 - Question 11

The noble gases make a group of chemical elements with similar properties under standard conditions, they are all odourless, colourless, monatomic gases with very low chemical reactivity. The six noble gases that occur naturally are Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe) and the radioactive Radon (Rn). 

Test : Chemistry - 4 - Question 12

Which one of the following is coated on the photographic plate? 

Detailed Solution for Test : Chemistry - 4 - Question 12

High resolution photographic plates having a coating of exceedingly fine-grained photosensitive emulsions with sub microscopic crystals of silver bromide in gelatin. 

Test : Chemistry - 4 - Question 13

Methane gas producing field is- 

Detailed Solution for Test : Chemistry - 4 - Question 13

Paddy fields are a major source of atmospheric methane .

Test : Chemistry - 4 - Question 14

A polymer used for making nonstick surface coating for utensils is- 

Detailed Solution for Test : Chemistry - 4 - Question 14

Polytetrafluoroethylene (PTFE) is usually known as Teflon. This is especially used for making a non-stick surface coating for utensils.

Test : Chemistry - 4 - Question 15

Which is used as laughing gas is- 

Detailed Solution for Test : Chemistry - 4 - Question 15

Nitrous Oxide (N2O) is also known as laughing gas. It is a colourless gas with a sweet odour and taste.  It is also used as the anesthetic gas. 

Test : Chemistry - 4 - Question 16

What is Nila thotha?

Detailed Solution for Test : Chemistry - 4 - Question 16

Nila thotha is a compound of Copper and sulphate. Its chemical formula is CuSO4.5H2O.

Test : Chemistry - 4 - Question 17

Which is the fundamental element of all organic compounds?

Detailed Solution for Test : Chemistry - 4 - Question 17

The organic compounds are a large class of chemical compounds in which one or more atoms of carbon are covalently linked atoms of other elements, most commonly Hydrogen, Oxygen or Nitrogen.

Test : Chemistry - 4 - Question 18

The important metal used with iron to make it rust free- 

Detailed Solution for Test : Chemistry - 4 - Question 18

Stainless steel alloy with a minimum of 10.5% Chromium content by mass. The presence of Chromium protects steel from corrosion, rust and make it high-temperature resistance. 

Test : Chemistry - 4 - Question 19

Which one of the following catalysts is used in hydrogenation of vegetable oils? 

Detailed Solution for Test : Chemistry - 4 - Question 19

During hydrogenation, the vegetable oils are reacted with hydrogen gas . A nickel catalyst is used to speed up the reaction. The double bond is converted to single bond in the reaction. In this way, the unsaturated fats can be made into saturated fats. 

Test : Chemistry - 4 - Question 20

What is the shape of Sulphur hexafluoride molecule? 

Detailed Solution for Test : Chemistry - 4 - Question 20

Sulphur hexafluoride (SF6) is an inorganic, colourless, odourless and non-flammable compound. SF6 has an octahedral shape. It has 12 electrons around the central Sulphur atom. This means there are six electron pairs arranged in an octahedral shape. 

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