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Class 9 Exam  >  Class 9 Tests  >  Hydrogen - Practice Test (1) - Class 9 MCQ

Hydrogen - Practice Test (1) - Class 9 MCQ


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25 Questions MCQ Test - Hydrogen - Practice Test (1)

Hydrogen - Practice Test (1) for Class 9 2024 is part of Class 9 preparation. The Hydrogen - Practice Test (1) questions and answers have been prepared according to the Class 9 exam syllabus.The Hydrogen - Practice Test (1) MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Hydrogen - Practice Test (1) below.
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Hydrogen - Practice Test (1) - Question 1
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Hydrogen has the simplest atomic structure among all the elements around us in Nature. Its electronic configuration is

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1H =1s1

Hydrogen - Practice Test (1) - Question 2
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Diborane (B2H6) is one of the following

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Diborane is electron deficient.

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Hydrogen - Practice Test (1) - Question 3
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In the process of obtaining pure de-mineralised water is passed initially through cation exchange , This makes the water

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Cation exchange resin have exchangeable hydrogen ions which makes the water acidic.

Hydrogen - Practice Test (1) - Question 4
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self-ionization) of water is called
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Self ionization of water is known as auto pyrolysis.

Hydrogen - Practice Test (1) - Question 5
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Which of the following statement is correct?
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group 14 elements forms electron precise hydrides and they have tetrahedral geometry.

Hydrogen - Practice Test (1) - Question 6
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Hydrogen is the first element in the periodic table and has resemblance to alkali metals as well as with halogens. However, its placement in the periodic table has been a subject of discussion in the past. Currently hydrogen is placed in which group?
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H properties matches with alkali metal as well as halogens so it is placed separately

Hydrogen - Practice Test (1) - Question 7
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Ammonia, NH3 is an example of
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NH3 is covalent hydride but since it has a lp of electron so it is electron rich hydrides.

Hydrogen - Practice Test (1) - Question 8
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Pure de-mineralised water is obtained by passing water through an anion exchange as a second process after passing it through a cation exchange. This makes the water
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Cation exchange resin have exchangeable hydrogen ions which makes the water acidic while anion exchange resin have exchangeable hydroxide ion which makes the water basic. Passing water to anion exchange resin as a second process after passing through anion exchange resin makes the water neutral.

Hydrogen - Practice Test (1) - Question 9
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When sodium peroxide is treated with dilute sulphuric acid, we get ______.
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Hydrogen - Practice Test (1) - Question 10
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Which of the following statement is correct?
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Statement A: Hydrides of group 13 act as Lewis acids.
- This statement is correct.
- Group 13 elements include boron (B), aluminum (Al), gallium (Ga), indium (In), and thallium (Tl).
- The hydrides of group 13 elements, such as BH3, AlH3, GaH3, InH3, and TlH3, can act as Lewis acids.
- A Lewis acid is a substance that accepts a pair of electrons to form a coordinate bond.
Statement B: Hydrides of group 13 act as Lewis bases.
- This statement is incorrect.
- A Lewis base is a substance that donates a pair of electrons to form a coordinate bond.
- Hydrides of group 13 elements do not donate electron pairs and therefore do not act as Lewis bases.
Statement C: Hydrides of group 14 act as Lewis acids.
- This statement is incorrect.
- Group 14 elements include carbon (C), silicon (Si), germanium (Ge), tin (Sn), and lead (Pb).
- The hydrides of group 14 elements, such as CH4, SiH4, GeH4, SnH4, and PbH4, do not act as Lewis acids.
Statement D: Hydrides of group 14 are electron deficient hydrides.
- This statement is correct.
- Group 14 elements have four valence electrons and require four more electrons to complete their octet.
- The hydrides of group 14 elements have fewer electrons than required for a stable octet, making them electron deficient.
Therefore, the correct statement is Statement A: Hydrides of group 13 act as Lewis acids.
Hydrogen - Practice Test (1) - Question 11
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Hydrogen is unique in behaviour because of its
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It has extremely small size.

Hydrogen - Practice Test (1) - Question 12
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Many d-block and f-block elements form
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d anf f block elements form metallic hydrides.

Hydrogen - Practice Test (1) - Question 13
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Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors which one is most important in this respect?
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Hydrogen can gain one electron to form a duplet.

Hydrogen - Practice Test (1) - Question 14
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Hydrogen peroxide is obtained by the electrolysis of ______.
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Electrolysis is of sulphuric acid is used to prepare H2O2

Hydrogen - Practice Test (1) - Question 15
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Which of the following statement is correct?
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Explanation:
Statement A:

Ionic hydrides are compounds where hydrogen is bonded to a highly electropositive element, such as a metal. These compounds have a high ionic character and can conduct electricity in the solid state. Therefore, statement A is correct.


Statement B:

Metallic hydrides are compounds where hydrogen is bonded to a metal. These compounds can conduct both heat and electricity. Therefore, statement B is incorrect.


Statement C:

Metallic hydrides are not deficient in hydrogen. They contain hydrogen atoms bonded to metal atoms. Therefore, statement C is incorrect.


Statement D:

Similar to statement A, ionic hydrides can conduct electricity in the solid state. Therefore, statement D is correct.


Based on the above explanations, statement A and statement D are correct. Statement C is incorrect. Therefore, the correct answer is A.
Hydrogen - Practice Test (1) - Question 16
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Hydrogen has three isotopes: protium, deuterium, and tritium. Which of them is radioactive and emits beta particles ?
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Tritium emits radioactive particles.

Hydrogen - Practice Test (1) - Question 17
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Metal hydrides are used for hydrogen storage because
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interstitial hydrides are formed because hydrogen occupies the interstitial site of metal lattice.

Hydrogen - Practice Test (1) - Question 18
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Why does H+ ion always get associated with other atoms or molecules?
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H+ ion has exceptionally small size ,it cannot exist freely.

Hydrogen - Practice Test (1) - Question 19
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Elements of which of the following group(s) of periodic table do not form hydrides.
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Group 7 to 9 doesnot form hydrides this is known as hydride gap.

Hydrogen - Practice Test (1) - Question 20
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The three isotopes of hydrogen in terms of chemical properties show one of the following properties
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Isotopes difference in their rate of reaction.

Hydrogen - Practice Test (1) - Question 21
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Presence of extensive hydrogen bonding between water molecules is responsible for
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hydrogen bonding is responsible for liquid and solid states.

Hydrogen - Practice Test (1) - Question 22
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Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH, KH, RbH, CsH, the correct order of increasing ionic character is
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As the size of cation increases ionic character also increases.

Hydrogen - Practice Test (1) - Question 23
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Only one element of ________ forms hydride.
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Only Cr who belongs to group 6 forms hydride.

Hydrogen - Practice Test (1) - Question 24
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Hydrogen is unique in behaviour because of its
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It has extremely small size.

Hydrogen - Practice Test (1) - Question 25
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The giant planets Jupiter and Saturn consist mostly of
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They have mainly Hydrogen.

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