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question_answer1)
Direction (1 - 25): The questions given below consist of Assertion and Reason. Use the following keys to select the correct answer. |
Assertion: Noble gases have highest ionisation enthalpies in their respective periods. |
Reason: Noble gases have stable closed shell electronic configuration. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer2)
Assertion: Fresh stain of iodine can be removed by washing with hypo solution. |
Reason: Hypo (Sodium thiosulphate) reduces iodine to colourless iodide ion. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer3)
Assertion: Sulphuric acid is more viscous than water. |
Reason: Concentrated sulphuric acid has a strong affinity for water. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer4)
Assertion: \[S{{O}_{3}}\] has a planar structure. |
Reason: S atom in \[S{{O}_{3}}\] is \[s{{p}^{2}}\] hybridised and OSO bond angle is \[120{}^\circ \]. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer5)
Assertion: Chlorine gas \[\left( C{{l}_{2}} \right)\] bleaches the articles permanently. |
Reason:\[C{{l}_{2}}\]is a strong reducing agent. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer6)
Assertion: Helium and beryllium have outer electronic configuration of the type \[n{{s}^{2}}\] |
Reason: Both are chemically inert. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer7)
Assertion: Electron gain enthalpy of oxygen is less than that of fluorine but greater than that of nitrogen. |
Reason: Ionisation enthalpies of the elements follow the order N > O > F. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer8)
Assertion: HClO is a stronger acid than HBrO. |
Reason: Cleavage of ClOH bond is easier than that of BrOH bond because Cl is more electronegative than Br. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer9)
Assertion: \[HCl{{O}_{4}}\] is a stronger acid than \[HCl{{O}_{3}}\] |
Reason: Oxidation state of Cl in \[HCl{{O}_{4}}\] is +7 and in \[HCl{{O}_{3}}\] is +5. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer10)
Assertion: \[SiF_{6}^{2-}\] is known but \[SiCl_{6}^{2-}\] is not. |
Reason: Size of fluorine is smaller and its lone pair of electrons interacts with d-orbital of silicon strongly. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer11)
Assertion: Reaction of \[S{{O}_{2}}\] and \[{{H}_{2}}S\] in the presence of \[F{{e}_{2}}{{O}_{3}}\] catalyst gives elemental sulphur. |
Reason:\[S{{O}_{2}}\] is a reducing agent. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer12)
Assertion: F atom has less negative electron gain enthalpy than Cl atom. |
Reason: Additional electrons are repelled more effectively by 3p electrons in Cl atom than by 2p electrons in F atom. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer13)
Assertion: Sulphur exhibits paramagnetic behaviour in vapour phase. |
Reason: In vapour state, sulphur partially exists as \[{{S}_{2}}\] molecule which has two unpaired electrons in the antibonding \[\pi \]* orbital. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer14)
Assertion: Fluorine (\[{{F}_{2}}\]) is a stronger oxidising agent than chlorine. |
Reason: Fluorine is more electronegative than chlorine. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer15)
Assertion: The compounds of noble gas element neon are not known. |
Reason: Neon does not have any vacant orbital in the valence shell of its atom. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer16)
Assertion: Reaction of \[{{H}_{2}}S\] with \[S{{O}_{2}}\] in aqueous solution gives sulphur. |
Reason: \[S{{O}_{2}}\] is a good reducing agent. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer17)
Assertion: Acidity of hydrides of group 16 elements increases down the group. |
Reason: Electronegativity of these elements increases down the group. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer18)
Assertion: Nitrogen and oxygen are the main components of atmosphere but do not react to form oxides of nitrogen. |
Reason: Chemical reaction between nitrogen and oxygen requires high temperature. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer19)
Assertion: Fluorine is the strongest oxidising agent in halogens. |
Reason: It displaces other halogens from its aqueous solution. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer20)
Assertion: All F-S-F bond angles in \[S{{F}_{4}}\] are greater than \[90{}^\circ \] but less than \[180{}^\circ \]. |
Reason: The lone pair : lone pair repulsion is weaker than bond pair : bond pair repulsion. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer21)
Assertion: HI cannot be prepared by the reaction of KI with concentrated \[{{H}_{2}}S{{O}_{4}}\]. |
Reason: HI has lowest H-X bond strength among halogen acids. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer22)
Assertion: Both rhombic and monoclinic sulphur exist as \[{{S}_{8}}\] but oxygen exists as \[{{O}_{2}}\]. |
Reason: Oxygen forms \[p\pi -p\pi \] multiple bond due to small size and small bond length but \[p\pi -p\pi \] bonding is not possible in sulphur. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer23)
Assertion: NaCl reacts with concentrated \[{{H}_{2}}S{{O}_{4}}\] to give colourless fumes with pungent smell. But on adding \[Mn{{O}_{2}}\], the fumes become greenish yellow. |
Reason: \[Mn{{O}_{2}}\] oxidises HCl to chlorine gas which is greenish yellow. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer24)
Assertion: \[S{{F}_{6}}\]cannot be hydrolysed but \[S{{F}_{4}}\] can be. |
Reason: Six F atoms in \[S{{F}_{6}}\] prevent the attack of \[{{H}_{2}}O\] on sulphur atom of \[S{{F}_{6}}\]. |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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question_answer25)
Assertion: The acidic strength of halogen acids decreases in the order : |
\[HF\text{ }>\text{ }HCl\text{ }>\text{ }HBr\text{ }>\text{ }HI\] |
Reason: The bond dissociation enthalpy of halogen acids decreases in the order |
\[HF\text{ }>\text{ }HCl\text{ }>\text{ }HBr\text{ }>\text{ }HI\] |
A)
If both assertion and reason are correct and reason is correct explanation for assertion. done
clear
B)
If both assertion and reason are correct but reason is not correct explanation for assertion. done
clear
C)
If assertion is correct but reason is incorrect. done
clear
D)
If assertion is wrong, but reason is correct. done
clear
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