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NEET Exam  >  NEET Tests  >  Chemistry 31 Years NEET Chapterwise Solved Papers  >  31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - NEET MCQ

31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - NEET MCQ


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15 Questions MCQ Test Chemistry 31 Years NEET Chapterwise Solved Papers - 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT)

31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) for NEET 2024 is part of Chemistry 31 Years NEET Chapterwise Solved Papers preparation. The 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) below.
Solutions of 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) questions in English are available as part of our Chemistry 31 Years NEET Chapterwise Solved Papers for NEET & 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) solutions in Hindi for Chemistry 31 Years NEET Chapterwise Solved Papers course. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free. Attempt 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) | 15 questions in 30 minutes | Mock test for NEET preparation | Free important questions MCQ to study Chemistry 31 Years NEET Chapterwise Solved Papers for NEET Exam | Download free PDF with solutions
31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 1
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Tritium, a radioactive isotope of hydrogen, emits which of the following particles?  [2021]

Detailed Solution for 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 1

Tritium (13H or T) This isotope of hydrogen is radioactive and emits low energy β-particle.
It has one proton and two neutrons in the nucleus. The concentration of tritium is very low.
It is just about one atom per 1018 atoms of protium.

31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 2
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Some statements about heavy water are given below:
(a) Heavy water is used as a moderator in nuclear reactors.
(b) Heavy water is more associated than ordinary water.
(c) Heavy water is more effective solvent than ordinary water.
Which of the above statements are correct?                                                                                                 [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 2
- Statement (a): True. Heavy water (D2O) is commonly used as a moderator in nuclear reactors because it slows down neutrons efficiently without absorbing them.
- Statement (b): True. Heavy water is more associated than ordinary water (H2O) due to stronger hydrogen bonds, which can lead to a higher boiling point.
- Statement (c): False. Heavy water is not a more effective solvent than ordinary water; it dissolves fewer substances because its molecular structure is different.
Correct answer: (b) and (c) are incorrect. Thus, the choice is (a) and (b).
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31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 3
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When H2O2 is oxidised the product is [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 3

31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 4
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When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. A, B, C and D respectively are [1998]
Detailed Solution for 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 4

Na produces golden yellow color with smokeless flame of Bunsen burner. Yellow is the characteristic color of Sodium.

31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 5
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Which one of the following pairs of substances on reaction will not evolve H2 gas? [1998]
Detailed Solution for 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 5

Copper does not evolve H2 from acid as it is below hydrogen in electro chemical series.

31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 6
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The hydride ion, H–, is a stronger base than the hydroxide ion, OH–. Which one of the following reactions will occur if sodium hydride (NaH) is dissolved in water? [1997]
Detailed Solution for 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 6

In this reaction H– acts as bronsted base as it accepts one proton (H+) from H2O and for H2.

OR

In this reaction H−H- accepts H+H+ and as such acts as a base, H2OH2O gives H+H+ and as such acts as an acid.

31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 7
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The volume strength of 1.5 NH2O2 solution is
Detailed Solution for 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 7

Volume strength = 5.6 × Normality = 5.6 × 1.5 = 8.4 L

31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 8
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Which of the following groups of ions makes the water hard ? [1994]
Detailed Solution for 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 8

Temporary hardness is due to presence of bicarbonates of calcium and magnesium and permanent hardness is due to the sulphates or chlorides of both of calcium and magnesium.

31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 9
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The O – O – H bond angle in H2O2 is [1994]
Detailed Solution for 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 9

O – O – H bond angle in H2O2 is 97°

31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 10
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The dielectric constant of H2O is 80. The electrostatic force of attraction between Na+ and Cl– will be [1994]
Detailed Solution for 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 10

Electrostatic forces of attraction are reduced to 1/80th in water.

31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 11
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At its melting point ice is lighter than water because [1992]
Detailed Solution for 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 11

In the structure of ice each molecule of H2O is surrounded by three H2O molecules in hexagonal honey comb manner. On the other in water, each molecule is surrounded by four neighbouring molecules randomly which results an open cage like structure. As a result there are a number of 'hole' or open spaces.
In such a structure lesser number of molecules are packed per ml. When ice melts a large no. of hydrogen bonds are broken.
The molecules therefore move into the holes or open spaces and come closer to each other than they were in solid state. This result sharp increase in the density. Therefore ice has lower density than water.

31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 12
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The ionization of hydrogen atom would give rise to[1990]
Detailed Solution for 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 12

31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 13
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Calgon used as a water softener is [1989]
Detailed Solution for 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 13

The complex salt of metaphosphoric acid sodium hexametaphosphate (NaPO3)6, is known as calgon. It is represented as Na2[Na4(PO3)6]

31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 14
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Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases H2O2 acts as a reducing agent in acid medium ? [1989]
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31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 15
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The reaction of H2O2 with H2S is an example of ........reaction

[1988]
Detailed Solution for 31 Year NEET Previous Year Questions: Hydrogen (Old NCERT) - Question 15

In this reaction H2S is oxidised to sulphur and H2O2 is reduced to H2O, hence this reaction show oxidation-reduction both i.e., redox reaction.

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