Every question from past board papers on p-Block Elements, newest paper first. Open any question for its full worked answer.
Given below are two statements :
Statement I : Like nitrogen that can form ammonia, arsenic can form arsine.
Statement II : Antimony cannot form antimony pentoxide.
In the light of the above statements, choose the most appropriate answer from the options given below :
Among Group 16 elements, which one does NOT show \(-2\) oxidation state?
Given below are two statements:
Statement I : The boiling point of hydrides of Group 16 elements follow the order
\(H_2O > H_2Te > H_2Se > H_2S\).
Statement II : On the basis of molecular mass, \(H_2O\) is expected to have lower boiling point than the other members of the group but due to the presence of extensive H-bonding in \(H_2O\), it has higher boiling point.
In the light of the above statements, choose the correct answer from the options given below:
The products A and B obtained in the following reactions, respectively, are
\(3ROH + PCl_3 \rightarrow 3RCl + A\)
\(ROH + PCl_5 \rightarrow RCl + HCl + B\)
Taking stability as the factor, which one of the following represents correct relationship?
Match List - I with List - II :
List - I: A. Coke B. Diamond C. Fullerene D. Graphite
List - II: I. Carbon atoms are sp\(^3\) hybridised. II. Used as a dry lubricant III. Used as a reducing agent IV. Cage like molecules
Choose the correct answer from the options given below :
Given below are two statements :
Statement I : The nutrient deficient water bodies lead to eutrophication.
Statement II : Eutrophication leads to decrease in the level of oxygen in the water bodies.
In the light of the above statements, choose the correct answer from the options given below :
Match List - I with List - II :
List - I (Oxoacids of Sulphur): A. Peroxodisulphuric acid B. Sulphuric acid C. Pyrosulphuric acid D. Sulphurous acid
List - II (Bonds): I. Two S-OH, Four S=O, One S-O-S II. Two S-OH, One S=O III. Two S-OH, Four S=O, One S-O-O-S IV. Two S-OH, Two S=O
Choose the correct answer from the options given below :
Which of the following statement is not correct about diborane ?
Choose the correct statement :
Match List - I with List - II.
List - I (Hydrides): (a) \(MgH_2\) (b) \(GeH_4\) (c) \(B_2H_6\) (d) HF
List - II (Nature): (i) Electron precise (ii) Electron deficient (iii) Electron rich (iv) Ionic
Choose the correct answer from the options given below :
Given below are two statements :
Statement I :
The boiling points of the following hydrides of group 16 elements increases in the order -
\(H_2O < H_2S < H_2Se < H_2Te\).
Statement II :
The boiling points of these hydrides increase with increase in molar mass.
In the light of the above statements, choose the most appropriate answer from the options given below :
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : ICl is more reactive than \(I_2\).
Reason (R) : I-Cl bond is weaker than I-I bond.
In the light of the above statements, choose the most appropriate answer from the options given below :
The pollution due to oxides of sulphur gets enhanced due to the presence of :
(a) particulate matter
(b) ozone
(c) hydrocarbons
(d) hydrogen peroxide
Choose the most appropriate answer from the options given below :
Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.
Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is :
Identify the correct statements from the following :
(a) CO\(_2\)(g) is used as refrigerant for ice-cream and frozen food.
(b) The structure of C\(_{60}\) contains twelve six carbon rings and twenty five carbon rings.
(c) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline.
(d) CO is colorless and odourless gas.
Which of the following oxoacid of sulphur has \(-\)O\(-\)O\(-\) linkage ?
Which of the following is not correct about carbon monoxide ?
Match the following and identify the correct option.
(a) CO(g) + H\(_2\)(g) (i) Mg(HCO\(_3\))\(_2\) + Ca(HCO\(_3\))\(_2\)
(b) Temporary hardness of water (ii) An electron deficient hydride
(c) B\(_2\)H\(_6\) (iii) Synthesis gas
(d) H\(_2\)O\(_2\) (iv) Non-planar structure
The correct structure of tribromooctaoxide is :
Among the following, the one that is not a green house gas is :
Which is the correct thermal stability order for H\(_2\)E (E = O, S, Se, Te and Po) ?
Which of the following is incorrect statement ?
Match the following :
(a) Pure nitrogen (i) Chlorine
(b) Haber process (ii) Sulphuric acid
(c) Contact process (iii) Ammonia
(d) Deacon's process (iv) Sodium azide or Barium azide
Which of the following is the correct option ?
Identify the incorrect statement related to PCl\(_5\) from the following :
Match the Xenon compounds in Column - I with its structure in Column - II and assign the correct code :
Column - I: (a) XeF\(_4\) (b) XeF\(_6\) (c) XeOF\(_4\) (d) XeO\(_3\)
Column - II: (i) pyramidal (ii) square planar (iii) distorted octahedral (iv) square pyramidal
Code :
Which of the following species is not stable ?
Which of the following statements is not true for halogens ?
Which one of the following elements is unable to form MF\(_6^{3-}\) ion ?
Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity ?
Which of the following is a sink for CO ?
Name the gas that can readily decolourise acidified \(KMnO_4\) solution :
It is because of inability of \(ns^2\) electrons of the valence shell to participate in bonding that :
\(HgCl_2\) and \(I_2\) both when dissolved in water containing \(I^-\) ions the pair of species formed is :
Match the interhalogen compounds of column I with the geometry in column II and assign the correct code.
Column I | Column II
(a) XX' | (i) T-shape
(b) \(XX_3'\) | (ii) Pentagonal bipyramidal
(c) \(XX_5'\) | (iii) Linear
(d) \(XX_7'\) | (iv) Square-pyramidal
| (v) Tetrahedral
Code : (a) (b) (c) (d)
In which pair of ions both the species contain S-S bond ?
Among the following, the correct order of acidity is :
When copper is heated with conc. \(HNO_3\) it produces :
Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules ?
The product obtained as a result of a reaction of nitrogen with \(CaC_2\) is :
Which is the correct statement for the given acids ?
Boric acid is an acid because its molecule
\(AlF_3\) is soluble in HF only in presence of KF. It is due to the formation of
Which of the following fluoro-compounds is most likely to behave as a Lewis base?
In context with beryllium, which one of the following statements is incorrect?
Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour?
