Revision: P - Block Elements Chemistry Science (English Medium) Class 12 CBSE
- Write the Structural Difference Between White Phosphorus and Red Phosphorus.
- Give Reasons When Cl2 Reacts with the Excess of F2, Clf3 is Formed and Not Fcl3.
- Account for the Following : Bih3 is the Strongest Reducing Agent Amongst All the Hydrides of Group 15.
- Give Reasons for the Following: E⁰ Value for (Mn3+|Mn2+) is Highly Positive than that for (Cr3+|Cr2+) Couple.
- Give reasons for the following : (CH3)3 P = O exists but (CH3)3 N = O does not.
- Account for the Following : Acidic Character Decreases from N2o3 to Bi2o3 in Group 15.
- Account for the Following the Enthalpy of Atomisation is Lowest for Zn in 3d Series of the Transition Elements.
- Arrange the Following in the Increasing Order of Property Mentioned
- Arrange the following in the increasing order of property mentioned: NH3, PH3, AsH3, SbH3, BiH3 (Base strength)
- Among the Hydrides of Group-15 Elements, Which Have The Lowest Boiling Point?
- Give a Reason for the Following: E° Value for (Mn2+|Mn) is Negative Whereas For (Cu2+|Cu) is Positive.
- Among the Hydrides of Group-15 Elements, Which Have the Maximum Basic Character?
- Among the Hydrides of Group-15 Elements, Which Have The Highest Bond Angle?
- Nitrogen does not form pentahalide.
- Account for the Following : Sulphur in Vapour Form Exhibits Paramagnetic Behaviour.
- Account for the Following : Noble Gases Have Very Low Boiling Points.
- Account for the following: N2 is less reactive at room temperature.
- Account for the following: Reducing character increases from NH3 to BiH3.
- Which acid of the following pair would you expect to be stronger? F−CH2−COOH or CH3−COOH
- Among the Hydrides of Group-15 Elements, Which Have The Maximum Reducing Character?
- Account for the Following : N − N Single Bond is Weaker than P − P Single Bond.
- Account for the Following Bi(V) is a Stronger Oxidizing Agent than Sb(V).
- Give Reasons H3po3 Undergoes Disproportionation Reaction but H3po4 Does Not.
- Account for the Following : Nitrogen Does Not Form Pentahalide.
- What Happens When (Nh4)2cr2o7 is Heated? Write the Equations.
- Tendency to Show –3 Oxidation State Decrease from Nitrogn (N) to Bismuth (Bi).
- Why does NO2 dimerise?
- Pb(No3)2 on Heating Gives a Brown Gas Which Undergoes Dimerisation on Cooling? Identify the Gas
- Write the Name of Gas Released When Cu is Added to Conc. Hno3
- Write the Name of Gas Released When Cu is Added to Dilute Hno3
- Which Allotrope of Sulphur is Thermally Stable at Room Temperature ?
- Out of White Phosphorus and Red Phosphorus, Which One is More Reactive and Why?
- Which allotrope of phosphorus is more reactive and why?
- Answer the Following Question. Write the Disproportionation Reaction of H3po3.
- Give reason for the following: Red phosphorus is less reactive than white phosphorus.
- Draw the structures of the following molecules: (HPO3)3
- What happens when H3PO3 is heated?
- which poisonous gas is evolved when white phosphorus is heated with conc. NaOH solution? Write the chemical equation involved
- Complete the following chemical equation: Ca3P2+H2O ->
- Account for the Following : Solid PCl5 is Ionic in Nature.
- Complete the Following Equations: Ag+PCl5 →
- Complete and balance the following equation: PCl3 + H2O ->
- Give reasons for the following : H3PO2 is a stronger reducing agent than H3PO3.
- Draw the Structures of the Following: H4p2o7 (Pyrophosphoric Acid)
- What is the basicity of H3PO4?
- What is the Basicity of H3po3 ?
- Complete the following equations : P4 + H2O →
- Write Balanced Chemical Equations Involved in the Following Reactions: Calcium Phosphide is Dissolved in Water.
- Draw the Structures of `H3po2`
- Give Reasons Thermal Stability Decreases from H2o to H2te
- Account for the Following : There is Large Difference Between the Melting and Boiling Points of Oxygen and Sulphur.
- Give Reasons for the Following : Oxygen Has Less Electron Gain Enthalpy with Negative Sign than Sulphur.
- Give Reactions for the Following: O – O Single Bond is Weaker than S – S Single Bond.
- Arrange the following in order of the property indicated set. HF, HCl, HBr, HI-decreasing bond enthalpy
- Give Reasons for the Following : H2Te is the Strongest Reducing Agent Amongst All the Hydrides of Group 16 Elements.
- Arrange the Following in the Order of the Property Indicated Against Set : H2o, H2s, H2se, H2te − Increasing Acidic Character.
- Give reasons: SO2 is reducing while TeO2 is an oxidising agent.
- Account for the Following: Oxygen Shows Catenation Behavior Less than Sulphur.
- Give Reasons for the Following: N2o5 is More Acidic than N2o3
- Write the Formula of the Compound of Iodine Which is Obtained When Conc. Hno3 Oxidises I2
- How Do You Prepare: K2mno4 from Mno2?
- Give a Reason for the Following : Ozone is Thermodynamically Less Stable than Oxygen.
- Give Reasons for the Following: Ozone is Thermodynamically Less Stable than Oxygen.
- Account for the following : Ozone is thermodynamically unstable
- The Two O−O Bond Lengths in the Ozone Molecule Are Equal.
- Complete the equation PbS + O3 gives
- How the Supersonic Jet Aeroplanes Are Responsible for the Depletion of Ozone Layers?
- Give Reasons Dioxygen is a Gas While Sulphur is a Solid at Room Temperature.
- Give reasons for the following: Sulphur in vapour state shows paramagnetic behaviour.
- How Do You Prepare: Na2cr2o7 from Na2cro4?
- Draw the Structures of the Following : H2s2o7
- What Happens When Conc. is H2so4 Added to Cu? Write the Equations.
- What Happens When So3 Is Passed Through Water? Write the Equations.
- Draw the structure of the following: H2S2O7
- What happens when: SO2 gas is passed through an aqueous solution Fe+3 salt?
- Answer the Following Question. Write a Chemical Reaction to Test Sulphur Dioxide Gas. Write a Chemical Equation Involved.
- Account for the Following : H3po2 Is a Stronger Reducing Agent than H3po3.
- Write the structures of the following molecule: H2SO3
- Draw the Structures of the Following Molecules: H2S2O8
- Draw Structures of the Following:
- Write One Difference Between Transition Elements and P-block Elements with Reference to Variability of Oxidation States.
- Write the conditions to maximize the yield of H2SO4 by contact process.
- Draw the structure of the following: H2SO4
- When Concentrated Sulphuric Acid Was Added to an Unknown Salt Present in a Test Tube a Brown Gas (A) Was Evolved Identify (A) and (B).And Write the Structures of (A) and (B). and Why Does Gas (A) Change to Solid on Cooling?
- Complete the following equations: C + conc. H2SO4 →
- Complete and Balance the Following Equations: S+H2so4(Conc.) →
- Complete the following equations: CaF2+H2SO4 →
- Complete Chemical Reactions Are:Cl2 + H2o → [Hcl + Hocl] →2 Hcl + [O] (Nascent Oxygen)
- Account for the Following : Acidic Character Increases from HF to HI.
- Account for the Following: Fluorine Does Not Exhibit Positive Oxidation State.
- Arrange the Following in the Decreasing Order of Their Reducing Character : Hf, Hcl, Hbr, Hi
- Compare the Oxidizing Action of F2 and Cl2 by Considering Parameters Such as Bond Dissociation Enthalpy, Electron Gain Enthalpy and Hydration Enthalpy.
- Which halogen compound in the following pair will react faster in SN2 reaction CH3Br or CH3I.
- Which halogen compound in each of the following pairs will react faster in SN2 reaction (CH3)3 C – Cl or CH3 – Cl
- Cl2 Acts as a Bleaching Agent.
- Fluorine is a Stronger Oxidising Agent than Chlorine. Why?
- Complete the Following Equations: Kmno4
- F2 has lower bond dissociation enthalpy than Cl2. Why?
- Write the Structure of the Product When Chlorobenzene is Treated with Methyl Chloride in the Presence of Sodium Metal and Dry Ether.
- Out of Chlorobenzene and Benzyl Chloride, Which One Gets Easily Hydrolysed by Aqueous Naoh and Why?
- Write Balanced Chemical Equations Involved in the Following Reactions:
- Write the Structure of the Alkene Formed by Dehydrohalogenation of 1-bromo-1methylcyclohexane with Alcoholic Koh.
- Give Reasons for the Following: Electron Gain Enthalpies of Halogens Are Largely Negative.
- What happens when (i) PCl5 is heated ? Write the reactions involved.
- Account for the following: Fluorine forms only one oxoacid HOF.
- Draw the structures of the HClO3.
- Account for the Following : Hclo4 is a Stronger Acid than Hclo.
- Draw the Structures of the Following: (1)Hclo4 (2)H3po3
- Draw the structures of the following molecules: BrF3
- Draw the Structures of the Following: Brf5
- Draw the structures of the following : ClF3
- Draw the structure of BrF5
- Account for the Following: Interhalogens Are More Reactive than Pure Halogens.
- ICl is more reactive than I2.
- Draw Structures of the Following: Xef4
- What happens when: XeF4 reacts with SbF5?
- Draw the structure of the following molecule: XeF4
- Which noble gas has the lowest boiling point?
- Which noble gas is used in filling balloons for meteorological observations?
- Complete the equation : XeF2+PF5 →
- Draw the Structures of the Following Xef6
- Complete the following equations : XeF4 + O2F2→
- Draw the Structure of Xef4.
- Write the structures of the following molecule: XeOF4
- Draw the Structures of the Following Molecules: Xef2
- Complete the Following Reactions: Xef6+2h2o ----->
- Complete the Following Reactions : Xef6 + 3h2o →
- Complete the Given Chemical Equations: 2xef_2 + 2h_2o->
- Draw the structure of the following: XeO3
- Complete the following equation: XeF𝐴2+H𝐴2O
- Account for the following: Helium is used in diving apparatus.
- Account for the Following : Although Fluorine Has Less Negative Electron Gain Enthalpy Yet F2 is a Strong Oxidizing Agent.
