30954623
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Test por Priyal Agarwal, actualizado hace más de 1 año
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Creado por Priyal Agarwal
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Copiado por Priyal Agarwal
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Pregunta 1
Pregunta
Which of the following statements regarding group 16 elements is not true?
Respuesta
-
The electronic configuration of Oxygen is [He]2s² 2p⁴.
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The atomic radii of the elements of group 16 are larger than those of the corresponding elements of group 15.
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The electronic configuration of Tellurium is [Kr]4d¹⁰ 5s² 5p⁴.
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The electronic configuration of Sulphur is [Ne]3s² 3p⁴.
Pregunta 2
Pregunta
ASSERTION (A): By mass, oxygen is the most abundant element in the human body.
REASON (R): It is principally found as O₂ in the bloodstream.
Respuesta
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Both ASSERTION and REASON are true, and REASON is the correct explanation of ASSERTION.
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Both ASSERTION and REASON are true, but REASON is not the correct explanation of ASSERTION.
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ASSERTION is true, but REASON is false.
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ASSERTION is false, but REASON is true.
Pregunta 3
Pregunta
Which of the following gasses is heavier than air?
Respuesta
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N₂
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O₂
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CO₂
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H₂
Pregunta 4
Pregunta
The formation of O⁻ is [blank_start]exothermic[blank_end], whereas the formation of O⁻² is [blank_start]endothermic[blank_end].
Respuesta
-
exothermic
-
endothermic
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exothermic
-
endothermic
Pregunta 5
Pregunta
The formation of the oxide ion, O²⁻(g), from oxygen atom requires first, and exothermic and then an endothermic reaction as shown below:
O(g) + e⁻ → O⁻(g) ; ΔfH⁻ = -141kJ mol⁻¹
O(g) + e⁻ → O²⁻(g) ; ΔfH⁻ = +780kJ mol⁻¹
Thus, process of formation of O²⁻ in gas phase is not favourable even though O²⁻ is isoelectronic with neon. It is due to the fact that:
Respuesta
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electron repulsion outweighs the stability gained by noble gas configuration
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oxygen is more electronegative.
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addition of electron in oxygen results in larger size of the ion.
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O⁻ ion has comparatively smaller size than oxygen atom.
Pregunta 6
Pregunta
ASSERTION (A): Both rhombic and monoclinic sulphur exist as S₈, but oxygen exists as O₂.
REASON (R): Oxygen forms pπ-pπ multiple bond due to small size and small bond length but pπ-pπ bonding is not possible in sulphur.
Respuesta
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Both ASSERTION and REASON are true, and REASON is the correct explanation of ASSERTION.
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Both ASSERTION and Reason are true, but REASON is not the correct explanation of ASSERTION.
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ASSERTION is true, but REASON is false.
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ASSSERTION is false, but REASON is true.
Pregunta 7
Pregunta
The allotrope of oxygen is the primary absorber of UV solar radiation in Earth's atmosphere.
Respuesta
- True
- False
Pregunta 8
Pregunta
What is the correct order of reactivity of group 16 elements?
Respuesta
-
S > O > Se > Te > Po
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O > Se > S > Te > Po
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O > S > Se > Te > Po
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S > O > Te > Po > Se
Pregunta 9
Pregunta
The hybridisation state of the central atom and shape of the molecules is given below. Mark the incorrect combination.
Respuesta
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SO₃ → sp² hybridisation, planar triangular
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SO₂ → sp² hybridisation, V-shaped
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H₂SO₄ → sp² hybridisation, V-shaped
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O₃ → sp² hybridisation, angular
Pregunta 10
Pregunta
What is the hybridisation state and oxidation state of sulphur in Caro's acid?
Respuesta
-
sp² + 10
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sp³ + 10
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sp² + 6
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sp³ + 6
Pregunta 11
Pregunta
Choose the correct order(s) of hydrolysis at room temperature.
Respuesta
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SF₄ < SF₆
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TeF₆ > Sef₆
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TeF₆ < SeF₆
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SF₄ > SF₆
Pregunta 12
Pregunta
What is the general outer electronic configuration of the Oxygen family?
Respuesta
-
ns²np⁴
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ns²np³
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ns²np⁵
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ns²np²
Pregunta 13
Pregunta
The ratio of sulphur in SO₂ and SO₃ molecules is 2:1.
Respuesta
- True
- False
Pregunta 14
Pregunta
Oxidation number of S in S₂Cl₂ is [blank_start]+1[blank_end].
Respuesta
-
+1
Pregunta 15
Respuesta
-
Pyrosulphuric Acid
Pregunta 16
Pregunta
Sulphuric acid has:
Respuesta
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low volatility
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strong affinity for water
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ability to act as an oxidising agent
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All of these
Pregunta 17
Pregunta
Ozone (O₃) can be used as/for:
Respuesta
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sterilising water
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manufacturing nitrocellulose products
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disinfectant
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refining petroleum
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bleaching ivory, oils, flour, starch, etc.
Pregunta 18
Pregunta
If a species has 16 protons, 18 electrons and 16 neutrons, then find the species and its charge.
Respuesta
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S¹⁻
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Si²⁻
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P³⁻
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S²⁻
Pregunta 19
Pregunta
Which of the following non-metal possesses the highest atomicity?
Respuesta
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Oxygen
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Phosphorous
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Sulphur
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Nitrogen
Pregunta 20
Pregunta
The bond angle between F OO in O₂F₂ is:
Respuesta
-
109°3'
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120°
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90°
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180°
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