P-Block Elements Group 13 to 18-Group 18 [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Chemistry]: Questions 19 - 24 of 29
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Question 19
Question MCQ▾
Both helium and nitrogen gas are inert but in deep sea diving mixture of is used rather than due to painful condition
Choices
Choice (4) | Response | |
---|---|---|
a. | True | |
b. | Data is insufficient | |
c. | False | |
d. | Cannot be predicted |
Question 20
Question MCQ▾
Which of the following noble gas does not have an octet of electrons in its outermost shell?
Choices
Choice (4) | Response | |
---|---|---|
a. | Neon | |
b. | Argon | |
c. | Radon | |
d. | Helium |
Question 21
Question MCQ▾
Which one of the following statements regarding helium is incorrect?
Choices
Choice (4) | Response | |
---|---|---|
a. | It is used to produce and sustain powerful superconducting magnets | |
b. | It is used to fill gas balloons instead of hydrogen because it is lighter and non-inflammable | |
c. | It is used as a cryogenic agent for carrying out experiments at low temperatures | |
d. | It is used in gas-cooled nuclear reactors |
Question 22
Passage
Read the passage given below and answer the questions that follow:
The noble gases have closed-shell electronic configuration and are monoatomic gases under normal conditions. The low boiling points of the lighter noble gases are due to weak dispersion forces between the atoms and the absence of other interatomic interactions.
The direct reaction of xenon with fluorine leads to a series of compounds with oxidation numbers , and . reacts violently with water to given . The compounds of xenon exhibit rich stereochemistry and their geometries can be deduced considering the total number of electron pairs in the valence shell.
Question 23 (1 of 3 Based on Passage)
Question MCQ▾
Argon is used in arc welding because of its
Choices
Choice (4) | Response | |
---|---|---|
a. | Low reactivity with metal | |
b. | Flammability | |
c. | Ability to lower the melting point of metal | |
d. | High calorific value |