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The p-Block Elements Chemistry - The p-Block Elements

Uttarakhand Board (UBSE) - STD 12 Science - Chemistry (Uttarakhand - English Medium). 514 questions in this chapter.

Question types

The p-Block Elements question types

514 questions across 7 question groups — pick any mix to generate a Chemistry paper with step-by-step answer keys.

514
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7
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5
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Sample Questions

The p-Block Elements questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 2M.C.Q (1 Marks)1 Mark
The anomalous behaviour of nitrogen is due to:
  • A
    Small size and high electronegativity.
  • B
    Non availability of $d-$orbitals in valency shell.
  • C
    Ease of multiple bond formation.
  • ✓
    All are correct.

Answer: D.

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Q 3M.C.Q (1 Marks)1 Mark
Compounds formed when the noble gases get entrapped in the cavities of crystal lattices of certain organic and inorganic compounds are known as:
  • A
    Interstitial compounds.
  • ✓
    Clathrates.
  • C
    Hydrates.
  • D
    Picrates.

Answer: B.

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Q 4M.C.Q (1 Marks)1 Mark
In the preparation of $\mathrm{HNO}_3,$ we get $NO$ gas by catalytic oxidation of ammonia. The moles of $NO$ produced by the oxidation of two moles of $\mathrm{NH}_3$ will be $......$
  • ✓
    $2$
  • B
    $3$
  • C
    $4$
  • D
    $6$

Answer: A.

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Q 6Assertion (A) & Reason (B) MCQ1 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.

Answer: A.

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Q 7Assertion (A) & Reason (B) MCQ1 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.

Answer: B.

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Q 8Assertion (A) & Reason (B) MCQ1 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.

Answer: B.

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Q 9Assertion (A) & Reason (B) MCQ1 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.

Answer: D.

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Q 10Assertion (A) & Reason (B) MCQ1 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.

Answer: B.

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Q 172 Marks Questions2 Marks
Account for the following:
  1. $N_2$ has higher bond dissociation energy than NO.
  2. $N_2$ and CO both have same bond order but CO is more reactive than $N_2.$
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Q 182 Marks Questions2 Marks
Name the reagents used in the following reactions:
  1. $ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{CO}-\text{CH}_3\xrightarrow{{ \ \ \ \ ? \ \ \ \ }}\text{CH}_3-\text{C}-\text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{OH}$
  2. $\text{CH}_3-\text{COOH}\xrightarrow{\ \ \ \ \ ? \ \ \ \ \ }\text{ClCH}_2-\text{COOH}$
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Q 213 Marks Question3 Marks
Give reasons:
  1. $SO_2$ is reducing while $TeO_2$ is an oxidizing agent.
  2. Nitrogen does not form pentahalide.
  3. $ICl$ is more reactive than $I_2.$
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Q 223 Marks Question3 Marks
Give reasons for the following:
  1. Red phosphorus is less reactive than white phosphorus.
  2. Electron gain enthalpies of halogens are largely negative.
  3. $N_2O_5$ is more acidic than $N_2O_3.$
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Q 233 Marks Question3 Marks
Give reasons for the following:
  1. $(CH_3)_3P=O$ exists but $(CH_3)_3\ N=O$ does not.
  2. Oxygen has less electron gain enthalpy with negative sign than sulphur.
  3. $H_3PO_2$ is a stronger reducing agent than $H_3PO_3.$
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Q 243 Marks Question3 Marks
Give reasons for the following:
  1. Where $R$ is an alkyl group, $R_3P=O$ exists but $R_3N=O$ does not.
  2. $PbCI_4$ is more covalent than $PbCI_2.$
  3. At room temperature, $N_2$ is much less reactive.
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Q 253 Marks Question3 Marks
How would you account for the following:
  1. $H_2S$ is more acidic than $H_2O.$
  2. The $N–O$ bond in ${NO_2}^-$ is shorter than the $N–O$ bond in ${NO_3}^-.$
  3. Both $O_2$ and $F_2$ stabilise high oxidation states but the ability of oxygen to stabilize the higher oxidation state exceeds that of fluorine.
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Q 26Case study (4 Marks)4 Marks
Read the passage given below and answer the following questions:
Interhalogen compounds are formed when halogen group elements react with each other. These are the compounds which consist of two or more different elements of group$-17$. A halogen with large size and low electronegativity reacts with an element of group$-17$ with small size and high electronegativity. As the ratio of radius of larger and smaller halogen increases, the number of atoms in a molecule also increases.
The following questions are multiple choice questions. Choose the most appropriate answer:
  1. The stability of interhalogen compounds follows the order.
  1. $IF_3 > BrF_3 > CIF_3$
  2. $CIF_3 > BrF_3 > IF_3$
  3. $BrF_3 > IF_3 > CIF_3$
  4. $CIF_3 > IF_3 > BrF_3$
  1. Identify the correct match from the following.
  1. $[ICI_2]^- - $ bent.
  2. $IF_7 $- pentagonal bipyramidal.
  3. $CIF_3 $- trigonal planar.
  4. $[BrF_4]^-$ - square pyramidal.
  1. In $XA_5$, the central atom has $($both $X$ and $A$ are halogens$).$
  1. $5$ bond pairs and no lone pairs.
  2. $5$ bond pairs and one lone pair.
  3. $6$ bond pairs and no lone pairs.
  4. $4$ bond pairs and one lone pair.
  1. In the known interbalogen compounds, the maximum number of atoms are,
  1. $4$
  2. $5$
  3. $8$
  4. $7$
  1. Which of the following is not the characteristic of interhalogen compounds.
  1. They are more reactive than halogens.
  2. They are quite unstable but none of them is explosive.
  3. They are covalent in nature.
  4. They have low boiling points and are highly volatile.
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Q 27Case study (4 Marks)4 Marks
Read the passage given below and answer the following questions:
Ozone is an unstable, dark blue diamagnetic gas. It absorbs the UV radiation strongly, thus protecting the people on earth from the harmful UV-radiation from the sun. The use of chlorofluorocarbon (CFC) in aerosol and refrigerators and their subsequent escape into the atmosphere, is blamed for making holes in the ozone layer over the Antarctica. Ozone acts as a strong oxidising agent in acidic and alkaline medium. for this property, ozone is used as a germicide and disinfectant for sterilizing water. It is also used in laboratory for the ozonolysis of organic compounds and in industry for the manufacture of potassium permanganate, artificial silk, etc.
The following questions are multiple choice questions. Choose the most appropriate answer:
  1. Which of the following statements is not correct for ozone?
  1. lt oxidises lead sulphide.
  2. It oxidises potassium iodide.
  3. It oxidises mercury.
  4. It cannot act as bleaching agent in dry state.
  1. Ozone gives carbonyl compounds with.
  1. Alkyl chloride
  2. Alkanes
  3. Alkenes followed by decomposition with $\frac{\text{Zn}}{\text{H}_2\text{O}}.$
  4. Alcohols followed by decomposition with $\frac{\text{Zn}}{\text{H}_2\text{O}}.$
  1. Ozone reacts with moist iodine gives.
  1. $HI$
  2. $HIO_3$
  3. $I_2O_5$
  4. $I_2O_4$
  1. Ozone acts as an oxidising agent due to.
  1. Iiberation of nascent oxygen.
  2. Iiberation of nascent oxygen.
  3. Both $(a)$ and $(b).$
  4. Both $(a)$ and $(b).$
  1. The colour of ozone molecule is:
  1. White.
  2. Blue.
  3. Pale green.
  4. Pale yellow.
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Q 28Case study (4 Marks)4 Marks
Read the passage given below and answer the following questions:
The halogen elements show great resemblances to one another in their chemical behaviour and properties of their compounds with other elements. There is, however, a progressive change in properties from F through $Cl, Br,$ and I to At. F is most reactive among the halogens and in fact, from all other elements and it has certain other properties that set it apart from the other halogens.
In these questions (Q.No. i - iv), a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
  2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  3. Assertion is correct statement but reason is wrong statement.
  4. Assertion is wrong statement but reason is correct statement.
  1. Assertion: $F_2 $ has high reactivity.
Reason: $F_2$ has low bond dissociation enthalpy.
  1. Assertion: The bond between $F - F$ is weaker than between $Cl - Cl.$
Reason: Atomic size of $F$ is smaller than that of $Cl.$
  1. Assertion: Fluoride does not show oxidation number greater than zero.
Reason: The halogens chlorine, bromine and iodine can show positive oxidation state of $+1, +3$ and $+7.$
  1. Assertion: F atom has less negative electron affinity than Cl atom.
Reason: Additional electrons are repelled more effectively by $3p-$electrons in $Cl$ than by $2p-$electrons in Fatom.
  1. Assertion: Fluorine is strongest oxidising agent in halogens.
Reason: It displaces other halogens from its aqueous solution.
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Q 29Case study (4 Marks)4 Marks
Read the passage given below and answer the following questions:
Under the normal conditions, noble gases are monoatomic and have closed shell electronic configuration. Lighter noble gases have low boiling points due to weak dispersion forces between the atoms and the absence of other interatomic interactions. Xenon, one of the important noble gas, forms a series of compounds with fluorine with oxidation number $+2, +4$ and $+6.$ All xenon fluorides are strong oxidising agents. $XeF_4$ reacts violently with water to give $XeO_3.$ The geometry of xenon compounds can be deduced by considering the total number of electron pairs in their valence shell.
The following questions are multiple choice questions. Choose the most appropriate answer:
  1. Among noble gases (from He to Xe) only xenon reacts with fluorine to form stable xenon fluorides because xenon.
  1. Has the largest size.
  2. Has the lowest ionisation enthalpy.
  3. Has the highest heat ofvapourisation.
  4. Is the most readily available noble gas.
  1. The structure of $XeO_3$ is:
  1. Square planar.
  2. Pyramidal.
  3. Linear.
  4. T-shaped.
  1. $XeF_6$ is expected to be.
  1. Oxidising agent.
  2. Reducing agent.
  3. Unreactive.
  4. Strongly basic.
  1. In the preparation of compound of xenon, Bartlett had taken $\text{O}_2^+\text{PtF}_6^-$ as a base compound. This is because,
  1. Both $O_2$ and $Xe$ have same size.
  2. Both $Xe$ and $O_2$ have same electron gain enthalpy.
  3. Both have almost same ionisation enthalpy.
  4. Both $Xe$ and $O_2$ are gases.
  1. The oxidation state of xenon in $XeO_3$ is:
  1. $+4$
  2. $+2$
  3. $+8$
  4. $+6$
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Q 30Case study (4 Marks)4 Marks
Read the passage given below and answer the following questions:
All the elements of group $16$ have $ns^2np^4$ configuration in their outermost shell. Therefore, the atoms of these elements try to gain or share two electrons to achieve noble gas configuration. Sulphur and other elements of group $16$ are less electronegative than oxygen, so, they cannot accept electrons easily. By sharing of two electrons with other elements, these elements acquire $ns^2np^6$ configuration and exhibit $+2$ oxidation state. Except oxygen, group $16$ elements have vacant d-orbitals in their valence shell to which electrons Call be promoted from P- and s-orbitals of the same shell As a result, they Call show $+4$ and $+6$ oxidation states also.
The following questions are multiple choice questions. Choose the most appropriate answer:
  1. Oxygen shows $+2$ oxidation state in.
  1. $OF_2$​​​​​​​
  2. $H_2O$
  3. $CI_2O$
  4. $H_2O_2$
  1. Like sulphur, oxygen is not able to show $+4$ and $+6$ oxidation states because?
  1. Oxygen is a gas while sulphur is a solid.
  2. Sulphur has high ionisation enthalpy as compared to oxygen.
  3. Oxygen has nod-orbitals in its valence shell.
  4. Oxygen has high electron affmity as compared to sulphur.
  1. Compounds of sulphur with $+4$ oxidation state acts as a/ an.
  1. Oxidising agent.
  2. Reducing agent.
  3. Both oxidising as well as reducing agen.
  4. Cannot be predicted.
  1. Oxidation state of sulphur in $Na_2S_4O_6$​​​​​​​ is:
  1. $\frac{7}{2}$
  2. $\frac{5}{2}$
  3. $\frac{1}{2}$
  4. $\frac{3}{2}$
  1. The oxidation states of sulphur in $S_8, SO_3​​​​​​​$​​​​​​​ and $H_2S$ are respectively.
  1. $0, +6$ and $-2$
  2. $+6, 0$ and $-2$
  3. $-2, 0$ and $+6$
  4. $+2, +6$ and $-2$
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Q 315 Marks Questions5 Marks
Give reasons for each of the following:
  1. $\text{SiF}_{6}^{2-}$ is known but $\text{SiCl}_{6}^{2-}$ is not known.
  2. Sulphur in vapour state exhibits paramagnetic behaviour.
  3. $PbO_2$ is a stronger oxidizing agent than $SnO_2$.
  4. $H_3PO_2$ acts as a monobasic acid.
  5. Bond dissociation energy of $F_2$​​​​​​​ is less than that of $Cl_2$.
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Q 325 Marks Questions5 Marks
  1. Account for the following:
  1. Thermal stability of water is much higher than that of $H_2S$.
  2. Anhydrous aluminium chloride acts as a catalyst.
  3. White phosphorus is more reactive than red phosphorus.
  1. Draw the structures of (i) $H_3PO_3$​​​​​​​ and (ii) $XeOF_4$​​​​​​​.
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Q 335 Marks Questions5 Marks
  1. Account for the following:
  1. Bond angle in $NH_4^+$is greater than that in $NH_3$.
  2. Reducing character decreases from $SO_2​​​​​​​$​​​​​​​ to $TeO_2$​​​​​​​.
  3. $HClO_4​​​​​​​$​​​​​​​ is a stronger acid than $HClO$.
  1. Draw the structures of the following :
  1. $H_2S_2O_8$
  2. $XeOF_4$
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Q 345 Marks Questions5 Marks
  1. Which poisonous gas is evolved when white phosphorus is heated with conc. $NaOH$ solution? Write the chemical equation.
  2. Write the formula of first noble gas compound prepared by $N$. Bartlett. What inspired $N$. Bartlett to prepare this compound?
  3. Fluorine is a stronger oxidizing agent than chlorine. Why?
  4. Write one use of chlorine gas.
  5. Complete the following equation: $CaF_2 + H_2SO_4 \xrightarrow{\text{ }\ \ \ \ \ \ \ \ \ \ \ \ }$
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Q 355 Marks Questions5 Marks
  1. Complete the following chemical equations:
  1. $Cu + HNO_3 (dilute) →$
  2. $XeF_4 + O_2F_2 \rightarrow $
  1. Explain the following observations:
  1. Phosphorus has greater tendency for catenation than nitrogen.
  2. Oxygen is a gas but sulphur a solid.
  3. The halogens are coloured. Why?
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