MCQ 11 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Among the hydrides of nitrogen family, $\ce{BiH_3}$ has the highest boiling point.
Reason: The boiling point increases down the group because of increase in size.
- ✓
Assertion and reason both are correct statements and reason is correct explanation for assertion.
- B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
- C
Assertion is correct statement but reason is wrong statement.
- D
Assertion is wrong statement but reason is correct statement.
AnswerCorrect option: A. Assertion and reason both are correct statements and reason is correct explanation for assertion.
Assertion and reason both are correct statements and reason is correct explanation for assertion.
View full question & answer→MCQ 21 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion:Although $\mathrm{PF}_5, \mathrm{PCl}_5$ and $\mathrm{PBr}_5$ are known, the pentahalides of nitrogen have not been observed.
Reason: Phosphorus has lower electronegativity than nitrogen.
- A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
- ✓
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
- C
Assertion is correct statement but reason is wrong statement.
- D
Assertion is wrong statement but reason is correct statement.
AnswerCorrect option: B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
Nitrogen cannot expand its octet due to the non$-$availability of $d-$orbital.
View full question & answer→MCQ 31 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Nitrogen is unreactive at room temperature but becomes reactive at elevated temperatures or in presence of a catalyst.
Reason: In nitrogen molecule, there is extensive delocalization of electrons.
- A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
- ✓
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
- C
Assertion is correct statement but reason is wrong statement.
- D
Assertion is wrong statement but reason is correct statement.
AnswerCorrect option: B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
Due to small size and high dissociation energy $(946 \ \ce{KJ mol}^{-1})$ of nitrogen, it is unreactive.
View full question & answer→MCQ 41 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: $\text{HOF}$ bond angle in $\text{HFO}$ is higher than $\text{HOCl}$ bond angle in $\text{HClO}.$
Reason: Oxygen is more electronegative than all halogens except fluorine.
- A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
- B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
- C
Assertion is correct statement but reason is wrong statement.
- ✓
Assertion is wrong statement but reason is correct statement.
AnswerCorrect option: D. Assertion is wrong statement but reason is correct statement.
$\text{HOF}$ bond angle in $\text{HFO}$ is lesser than that of $\text{HOCl}$ bond angle in $\text{HClO}.$ Oxygen is more electronegative than all halogens except fluorine.
View full question & answer→MCQ 51 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Sulphuric acid is more viscous than water.
Reason: Concentrated sulphuric acid has a great affinity for water.
- A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
- ✓
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
- C
Assertion is correct statement but reason is wrong statement.
- D
Assertion is wrong statement but reason is correct statement.
AnswerCorrect option: B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
Molecules of sulphuric acid are associated due to large number of intermolecular hydrogen bonding.
View full question & answer→MCQ 61 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Xenon forms fluorides.
Reason: Because $5d-$orbitals are available for valence shell expansion.
- A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
- ✓
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
- C
Assertion is correct statement but reason is wrong statement.
- D
Assertion is wrong statement but reason is correct statement.
AnswerCorrect option: B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
Xenon forms fluorides primarily because only fluorine and oxygen are electronegative enough to excite electron of xenon into its vacant $5d-$orbitals and allow bonding.
View full question & answer→MCQ 71 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion : $N_2$ is less reactive than $P_4$
Reason : Nitrogen has more electron gain enthalpy than phosphorus.
- A
Assertion is correct, reason is correct; reason is a correct explanation for assertion.
- B
Assertion is correct, reason is correct; reason is not a correct explanation for assertion
- ✓
Assertion is correct, reason is incorrect
- D
Assertion is incorrect, reason is correct.
AnswerCorrect option: C. Assertion is correct, reason is incorrect
View full question & answer→MCQ 81 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: $\ce{Cl_2}$ gas bleaches the articles permanently.
Reason: $\ce{Cl_2}$ is a strong reducing agent
- A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
- B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
- ✓
Assertion is correct statement but reason is wrong statement.
- D
Assertion is wrong statement but reason is correct statement.
AnswerCorrect option: C. Assertion is correct statement but reason is wrong statement.
$\ce{Cl_2}$ is an oxidising agent. It bleaches the articles by oxidation permanently in presence of moisture.
View full question & answer→MCQ 91 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Nitrogen has higher ionization energy than that of oxygen.
Reason: Nitrogen has smaller atomic size than that of oxygen.
- A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
- B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
- ✓
Assertion is correct statement but reason is wrong statement.
- D
Assertion is wrong statement but reason is correct statement.
AnswerCorrect option: C. Assertion is correct statement but reason is wrong statement.
$\mathrm{N}\left(\mathrm{s}^2 2 s^2 2 \mathrm{p}^3\right)$ has higher ionisation energy than $\mathrm{O}\left(1 \mathrm{s}^2 2 s^2 2 \mathrm{p}^4\right)$ due to stable half$-$filled configuration. Nitrogen has larger atomic size than oxygen.
View full question & answer→MCQ 101 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: $\text{NO}_3^-$ is planar while $NH_3$ is pyramidal.
Reason: $N$ in $\text{NO}_3^-$ is $sp^2$ hybridized but in $NH_3$ it is $sp^3$ hybridized.
- ✓
Assertion and reason both are correct statements and reason is correct explanation for assertion.
- B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
- C
Assertion is correct statement but reason is wrong statement.
- D
Assertion is wrong statement but reason is correct statement.
AnswerCorrect option: A. Assertion and reason both are correct statements and reason is correct explanation for assertion.
Assertion and reason both are correct statements and reason is correct explanation for assertion.
View full question & answer→MCQ 111 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: The m.pt./ b.pt. of noble gases are quite high
Reason: The interparticle forces among noble gases in their liquid state are weak van der Waals' forces.
- A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
- B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
- C
Assertion is correct statement but reason is wrong statement.
- ✓
Assertion is wrong statement but reason is correct statement.
AnswerCorrect option: D. Assertion is wrong statement but reason is correct statement.
The melting point/ boiling point of noble gases are quite low. The interparticle forces among noble gases are weak van der Waals' forces.
View full question & answer→MCQ 121 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Caro's acid has $S$ atom in $+6$ oxidation state.
Reason: Caro's acid contains one peroxo $\text{O}_2^{2-}$ group.
- ✓
Assertion and reason both are correct statements and reason is correct explanation for assertion.
- B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
- C
Assertion is correct statement but reason is wrong statement.
- D
Assertion is wrong statement but reason is correct statement.
AnswerCorrect option: A. Assertion and reason both are correct statements and reason is correct explanation for assertion.
This can be explained through structure of caro's acid $($peroxomonosulphuric acid$).$
Oxidation no. of $S = x,$ oxidation no. of $H = +1,$
Oxidation no. of $O$ in peroxo linkage $= -1 ($each$),$
Oxidation no. of other oxygen atoms $= -2 ($each$).$
$2 + x - 6 - 2 = 0$ or $x = +6.$ View full question & answer→MCQ 131 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Ozone reacts with $\ce{BaO_2}$ to give $\ce{BaO}.$
Reason: Ozone acts as an oxidising agent in this reaction.
- A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
- B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
- ✓
Assertion is correct statement but reason is wrong statement.
- D
Assertion is wrong statement but reason is correct statement.
AnswerCorrect option: C. Assertion is correct statement but reason is wrong statement.
Ozone acts as a reducing agent in this reaction.
$\text{BaO}_2 + \text{O}_3\rightarrow\text{BaO} + 2\text{O}_2\uparrow$
View full question & answer→MCQ 141 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Halogens are coloured.
Reason: Halogen molecules absorb some wavelength of visible light and the electrons are promoted to higher energy molecular orbitals.
- ✓
Assertion and reason both are correct statements and reason is correct explanation for assertion.
- B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
- C
Assertion is correct statement but reason is wrong statement.
- D
Assertion is wrong statement but reason is correct statement.
AnswerCorrect option: A. Assertion and reason both are correct statements and reason is correct explanation for assertion.
View full question & answer→MCQ 151 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Among nitrogen halides $NX_3,$ the dipole moment is highest for $NI_3$ and lowest for $NF_3.$
Reason: Nitrogen halides $NX_3,$ have trigonal pyramidal structure.
- A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
- ✓
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
- C
Assertion is correct statement but reason is wrong statement.
- D
Assertion is wrong statement but reason is correct statement.
AnswerCorrect option: B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
In case of $NI_3,$ the lone pair moment adds on the resultant of the $N-I$ moments but in case of $NF_3$, the lone pair moment on $N$ partly cancels the resultant $N-F$ moments.
View full question & answer→MCQ 161 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion : Dinitrogen is inert at room temperature.
Reason : Dinitrogen directly combines with lithium to form ionic nitrides.
- A
Assertion is correct, reason is correct; reason is a correct explanation for assertion.
- B
Assertion is correct, reason is correct; reason is not a correct explanation for assertion
- ✓
Assertion is correct, reason is incorrect
- D
Assertion is incorrect, reason is correct.
AnswerCorrect option: C. Assertion is correct, reason is incorrect
View full question & answer→MCQ 171 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Both rhombic and monoclinic sulphur exist as $S_8$ but oxygen exists as $O_2$.
Reason: Oxygen forms $\text{p}\pi-\text{p}\pi$ multiple bond due to small size and small bond length but $\text{p}\pi-\text{p}\pi$ bonding is not possible in sulphur.
- ✓
Assertion and reason both are correct statements and reason is correct explanation for assertion.
- B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
- C
Assertion is correct statement but reason is wrong statement.
- D
Assertion is wrong statement but reason is correct statement.
AnswerCorrect option: A. Assertion and reason both are correct statements and reason is correct explanation for assertion.
Assertion and reason both are correct statements and reason is correct explanation for assertion.
View full question & answer→MCQ 181 Mark
In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: $SF_6$ cannot be hydrolysed but $SF_4$ can be.
Reason: Six $F$ atoms in $SF_6$ prevent the attack of $H_2O$ on sulphur atom of $SF_6.$
- ✓
Assertion and reason both are correct statements and reason is correct explanation for assertion.
- B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
- C
Assertion is correct statement but reason is wrong statement.
- D
Assertion is wrong statement but reason is correct statement.
AnswerCorrect option: A. Assertion and reason both are correct statements and reason is correct explanation for assertion.
Assertion and reason both are correct statements and reason is correct explanation for assertion.
View full question & answer→