Test : Chemistry - 2


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20 Questions MCQ Test NDA (National Defence Academy) Mock Test Series | Test : Chemistry - 2

Test : Chemistry - 2 for Defence 2022 is part of NDA (National Defence Academy) Mock Test Series preparation. The Test : Chemistry - 2 questions and answers have been prepared according to the Defence exam syllabus.The Test : Chemistry - 2 MCQs are made for Defence 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test : Chemistry - 2 below.
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Test : Chemistry - 2 - Question 1

Transition metals are often paramagnetic owing to- 

Detailed Solution for Test : Chemistry - 2 - Question 1

Transition elements containing one or more unpaired electrons show paramagnetic behavior where the effects of individual electrons are not mutually compensated. The magnetic moment due to unpaired electron spins are aligned parallel to the external magnetic field more effectively.

Test : Chemistry - 2 - Question 2

Electron affinity of noble gases is - 

Detailed Solution for Test : Chemistry - 2 - Question 2

Large atoms have low ionization energy and low electron affinity. Therefore, they tend to lose electrons and do not tend to gain electrons. Any electrons added to a noble gas would have to be the first electron in a new (larger) energy level. This causes the noble gases to have essentially zero electron affinity.

Test : Chemistry - 2 - Question 3

All the elements in a group in the periodic table have the same- 

Detailed Solution for Test : Chemistry - 2 - Question 3

The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements.

Test : Chemistry - 2 - Question 4

“Which elements are arranged in increasing order of atomic weight, every eighth element has properties similar to the first”. This law had been given by- 

Detailed Solution for Test : Chemistry - 2 - Question 4

John Alexander Reina Newlands (26 November 1837 – 29 July 1898) was a British chemist. Newlands was the first person to devise a periodic table of chemical elements arranged in order of their relative atomic masses.

Test : Chemistry - 2 - Question 5

Which of the following gases is heavier than oxygen?

Detailed Solution for Test : Chemistry - 2 - Question 5

For oxygen, a molecule consists of two oxygen atoms, and has a weight of 2 x 16 = 32. For carbon dioxide, there is one carbon atom (weight 12) and two oxygen atoms (mass 16 x 2) for a total of 44. This means that carbon dioxide should be about 44/32 = 1.375 times (ideally) as heavy as an equivalent volume of oxygen. In reality, carbon dioxide is 1.383 times as heavy as oxygen. Even after solidification carbon dioxide is slightly heavier than similar volume of solid oxygen.

Test : Chemistry - 2 - Question 6

All isotopes of the same element have _________.

Detailed Solution for Test : Chemistry - 2 - Question 6

All isotopes of the same element have the same atomic number but different atomic masses.

Test : Chemistry - 2 - Question 7

What are the main components of Brass Alloy?

Detailed Solution for Test : Chemistry - 2 - Question 7

Brass is a metallic alloy that is made of copper and zinc. Brass is commonly used for decorative purposes primarily because of its resemblance to gold. It is also a commonly used to make musical instruments due to its high workability and durability.

Test : Chemistry - 2 - Question 8

Which of the following is a chemical formula of quicklime?

Detailed Solution for Test : Chemistry - 2 - Question 8

CaO is a chemical formula of quicklime

Test : Chemistry - 2 - Question 9

The plants receive Nitrogen in form of: 

Detailed Solution for Test : Chemistry - 2 - Question 9

Ammonium (NH4+) and nitrate (NO3-) are the predominant inorganic forms of nitrogen in the soil. Plants normally use nitrogen in the form of nitrate.

Test : Chemistry - 2 - Question 10

What is formed when Magnesium is burnt?

Detailed Solution for Test : Chemistry - 2 - Question 10

When the magnesium metal burns it reacts with oxygen found in the air to form Magnesium Oxide. Oxygen and magnesium combine in a chemical reaction to form this compound. After it burns, it forms a white ash of the magnesium oxide.

Test : Chemistry - 2 - Question 11

Which of the following statements regarding heavy water are correct?

I. It is extensively used as a moderator in nuclear reactors.

II. It cannot be used in exchange reaction to study reaction mechanism.

III. Viscosity of heavy water is relatively smaller than that of ordinary water.

IV. The dielectric constant of heavy water is smaller than that of ordinary water. Select the correct answer using the codes given below:

Test : Chemistry - 2 - Question 12

Statement I: Oxygen gas is easily produced at a faster rate by heating a mixture of potassium chlorate and manganese dioxide than heating potassium chlorate alone.

Statement II: Manganese dioxide acts as a negative catalyst. 

Test : Chemistry - 2 - Question 13

To weld metals together, high temperature is required. Such a high temperature is obtained by burning

Test : Chemistry - 2 - Question 14

Graphite is a much better conductor of heat and electricity than diamond. This is due to the fact that each carbon atom in graphite 

Test : Chemistry - 2 - Question 15

Which one of the following elements will not react with dilute HCl to produce H₂ ? 

Test : Chemistry - 2 - Question 16

Which one of the following oxides of nitrogen is known as ‘anhydride’ of nitric acid? 

Test : Chemistry - 2 - Question 17

Statement I: Petroleum is a mixture of many different hydrocarbons of different densities.

Statement II: The grade of petroleum depends mainly on the relative proportion of the different hydrocarbons. Codes

Test : Chemistry - 2 - Question 18

Which of the following carbon compounds will not give a sooty flame? 

Test : Chemistry - 2 - Question 19

Which of the following is water gas ? 

Detailed Solution for Test : Chemistry - 2 - Question 19

Water gas is the mixture of hydrogen and carbon monoxide.  Water gas is obtained by action of steam on red-hot coke.
H2​O+C→H2​+CO

Test : Chemistry - 2 - Question 20

A glass vessel is filled with water up to the brim and a lid is fixed to it tightly. Then it is kept inside a freezer for hours. What is expected to happen? 

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