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Hydrogen

8 Questions
All Exams NEET AIIMS
2023 NEET MCQ
NEET 2023

Which of the following statements are NOT correct?

A. Hydrogen is used to reduce heavy metal oxides to metals.

B. Heavy water is used to study reaction mechanism.

C. Hydrogen is used to make saturated fats from oils

D. The $\mathrm{H}-\mathrm{H}$ bond dissociation enthalpy is lowest as compared to a single bond between two atoms of any element.

E. Hydrogen reduces oxides of metals that are more active than iron.

Choose the most appropriate answer from the options given below:

A.
B, D only
B.
D, E only
C.
A, B, C only
D.
B, C, D, E only
2022 NEET MCQ
NEET 2022 Phase 1

The pollution due to oxides of sulphur gets enhanced due to the presence of:

(a) particulate matter (b) ozone (c) hydrocarbons (d) hydrogen peroxide

Choose the most appropriate answer from the options given below:

A.
(a), (d) only
B.
(a), (b), (d) only
C.
(b), (c), (d) only
D.
(a), (c), (d) only
2022 NEET MCQ
NEET 2022 Phase 1

In the neutral or faintly alkaline medium, KMnO4 oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is form

A.
+7 to +4
B.
+6 to +4
C.
+7 to +3
D.
+6 to +5
2021 NEET MCQ
NEET 2021
Tritium, a radioactive isotope of hydrogen, emits which of the the following particles?
A.
Neutron (n)
B.
Beta ($\beta$$-$)
C.
Alpha ($\alpha$)
D.
Gamma ($\gamma$)
2019 NEET MCQ
NEET 2019
The method used to remove temporary hardness of water is :
A.
Ion-exchange method
B.
Synthetic resins method
C.
Calgon’s method
D.
Clark’s method
2010 NEET MCQ
AIPMT 2010 Mains
Some statements about heavy water are given below:
(i)  Heavy water is used as a moderator in nuclear reactors.
(ii)  Heavy water is more associated than ordinary water.
(iii)  Heavy water is more effective solvent than ordinary water.

Which of the above statements are correct?
A.
(i) and (ii)
B.
(i), (ii) and (iii)
C.
(ii) and (iii)
D.
(i) and (iii)
2003 NEET MCQ
AIPMT 2003
The structure of H2O2 is
A.
spherical
B.
non-planar
C.
planar
D.
linear
2016 NEET MSQ
NEET 2016 Phase 1
Which of the following statements about hydrogen is incorrect?
A.
Hydronium ion, H3O+ exists freely in solution.
B.
Dihydrogen does not act as a reducing agent.
C.
Hydrogen has three isotopes of which tritium is the most common.
D.
Hydrogen never acts as cation in ionic salts.