2nd Year Chemistry Important Short Questions

Ahsa.Pk has carefully found some 2nd Year Chemistry Important Short Questions that are most essential ones for class 12 students’ board examination preparation.

2nd Year Chemistry Important Short Questions

Chapter 1

  • Why melting and boiling points of elements belonging to group VA –VIIA are lower.
  • Discuss the trend of ionization energy in periodic table.
  • Why first ionization energy of Mg is greater than that of Na?
  • Define electron affinity. Give its trend in Periodic table.
  • Write any two resemblances of hydrogen with Alkali Metals.
  • Give reason that hydration energy of Al3+ ions is more than Mg2+ ions.

Chapter 2

  • Why group IIA elements are called Alkaline Earth Metals.
  • Give reason that alkali metals are strong reducing agents.
  • Why is CaCl2 added in molten NaCl in Down’s cell
  • Write the advantages of Nelson’s cell.
  • Differentiate between Alkali and Alkaline earth metal.
  • Lithium is least reactive element of all alkali metals. Give reasons.

Chapter 3

  • Aqueous solution of borax is alkaline in nature Justify the statement.
  • What is reaction of heat on orthoboricacid, H3BO3?
  • Give reactions of Aluminium with dilute and concentrated H2SO4.
  • Outline any four uses of aluminum?
  • Give two similarities between carbon and silicon.

Chapter 4

  • How does nitrogen differ from other elements of its group?
  • Why does aqua regia dissolve gold and platinum?
  • Why the elements of group VI A other than oxygen show more than two oxidation states.
  • Write down a comparison of the properties of oxygen and sulphur.
  • Write down the equation for the reaction between conc. H2SO4 and copper and explain what type of reaction is it.
  • “N2O supports combustion” Give two reactions in favour of the statement?
  • What happens when NO2 is dissolved in water?
  • Give reaction of Cu with dil. HNO3 and conc. HNO3.
  • Write any four uses of nitric acid?
  • How does HNO3 act as an oxidizing agent?
  • What is aque-regia?
  • Write two dissimilarities of oxygen and sulphur?
  • What is the optimum condition for the manufacture of H2SO4 in the contact process?
  • Write two reactions in which sulphuric acid acts as a dehydrating agent.
  • How sulphuric acid act as an oxidizing agent.
  • Write any four important uses of H2SO4.

Chapter 5

  • Arrange the following ions in order of increasing size  F, CL- , Br-, I-.
  • Why iodine has metallic luster?
  • Why the lattice energy of Fluorides is greater than Chlorides.
  • Halogens are strong oxidizing agents. Justify.
  • On what factors, oxidizing power of halogen depends upon.
  • Why oxidizing power of halogens decreases down the group?
  • HF is a weak acid, while HCl is a strong acid. Give reason.
  • Write down reaction of chlorine with cold and hot NaOH.
  • HXO4 is the strongest oxyacid. Explain.
  • Write four uses of Bleaching powder.
  • Write Chemical reactions of Bleaching powder with HCl and NH3.
  • What happen when bleaching powder reacts with the following reagents dil H2SO4 excess of conce. H2SO4, NH3, HI and CO3.

Chapter 6

  • Give four important characteristics of transition elements.
  • What are interstitial compounds?
  • Give reason for the development of colours in the transition complexes.
  • What is Tin plating and what happens when it is damaged?
  • Define sacrificial corrosion.

Chapter 7

  • What is vital force Theory?
  • Define “Thermal cracking”.
  • Define catenation?
  • What is catalytic cracking?
  • Octane number of gasoline is improved by reforming. Explain.
  • Differentiate between Alicyclic and aromatic compounds.
  • What are alicyclic compounds? Give an example.
  • Write name and structure of two aromatic heterocyclic compounds.
  • Define tautumerism, give an example.
  • 1-Butyne does not show geometrical isomerism, but 2-Butene does. Give reason?
  • Why is restricted rotation necessary to show the geometrical isomerism?
  • What is metamerism? Give an example.

Chapter 8

  • Write structural formulas of the following: But-1- en- 3 –yne & Vinyl acetylene.
  • Prepare alkanes from Clemmensen and Wolf-Kishner’s reduction methods from aldehyde or ketone?
  • How ethane can be prepared by Kolb’s electrolysis?
  • What is the effect of branching on boiling points of alkanes?
  • Sigma bonds are inert in alkanes. Justify.
  • What is heat of combustion?
  • Convert CH4 to CH2O.
  • Give four uses of methane?
  • Convert methane to ethane?
  • Ethene can be converted into ethyl alcohol. Write equation.
  • What is Baeyer’s test? What are its uses?
  • Describe how we can distinguish between ethane and ethane?
  • Explain Markownikov’s rule with one example.
  • Define Rany nickel. Give its uses?
  • Give the mechanism of ozonolysis of ethane?
  • What is hydrogenolysis? Give an example.
  • How will you convert 1- butane to 1 – butyne.
  • How ethyne is converted to ,(a)- Acetaldehyde  (b) Benzene.
  • How Cis and Trans alkenes are obtained from alkynes.
  • Distinguish between ethane and ethyne by a chemical test.

Chapter 9

  • What are monocyclic and polycyclic aromatic hydrocarbons?
  • Write names and draw structures of three possible isomers of Xylene?
  • Give two reasons to rule out straight chain structure of benzene?
  • What information’s are obtained about structure of benzene from X-ray studies?
  • Define resonance energy? What is the resonance energy of Benzene?
  • Why benzene is less reactive than alkenes although it has three pi bond in it.
  • Benzene can be prepared commercially form acetylene. Give reaction with conditions?
  • What is Wurtz-Fritting reaction?
  • Give the mechanism of nitration of Benzene?
  • Give mechanism of sulphonation of Benzene?
  • Convert bezne in to  (i)- Toluene    (ii)- Acetophenone
  • Write the mechanism of alkylation of benzene?
  • Write the reaction when mixture of benzene vapours and oxygen is passed over heated vanadium pentoxide.
  • How toluene can be converted to benzoic acid?
  • What is meant by meta directing group.

Chapter 10

  • What are primary and tertiary Alkyl Halides? Give examples.
  • Prepare alkyl halides from alcohols by two methods?
  • Write excellent method to prepare alkyle iodide.
  • What is leaving group? Give examples.
  • Define electrophile and nucleophile?
  • Give general mechanism patterns of SN2 reaction.
  • Discuss E2 mechanism.
  • What are elimination reactions? Give example E1 reaction.
  • What are B-Elimination reactions?

Chapter 11

  • Why ethyl alcohol is liquid while Ethyl chloride is gas at room temperature.
  • Absolute alcohol cannot be prepared by fermentation process. Why?
  • Explain denaturing of alcohol?
  • How will you distinguish between methanol and ethanol?
  • How will you distinguish between 1- propanol and 2- propanol?
  • Write four uses of each methanol and ethanol.
  • Prepare phenol from chlorobenzene by Dow’s method.
  • Write down two methods for the preparation of phenol.
  • Why Phenol is acidic while alcohol is not?
  • Explain acidic behavior of phenol.

Chapter 12

  • Define aldol condensation. Give its mechanism.
  • Define Cannizaro’s reaction. Explain its mechanism with a suitable example.
  • Write four tests by which aldehydes can be distinguished from ketones.
  • Write any four uses of acetaldehyde.

Chapter 13

  • Write down structural formulae of pthalic acid and malonic acid.
  • Write down mechanism of reactions.  (a) Between acetic acid and ethanol  (b)   Acetic acid and thinoyl chloride
  • How would you convert acetic acid into methane and acetic anhydride.
  • What happens when followings are heated?

          a)       Sodium Format and Soda lime

          b)      Sodium acetate and soda lime

  •  Give four uses of acetic acid? 

Chapter 15

  • Distinguish micronutrients and macronutrients for plants. Chapter 15
  • Give reactions of preparation of urea by using NH3 and CO2.
  • Brief about perilling of urea.
  • Write down formulas for superphosphate and triple phosphate?
  • Explain the importance of potassium fertilizer?
  • How urea is manufactured? Write its reactions.
  • What are phosphatic fertilizers? Give two formulas of phosphatic fertilizer.
  • Give an idea about clinker?
  • Define cement. Give its essential components.
  • Draw flow sheet diagram for the manufacture of cement?
  • Describe chemical changes that occur in the different zones during the manufacture of cement.
  • What do you mean by Calcareous materials and argillaceous material, the manufacturing of cement?
  • What are clinkers? How are they converted into cement?
  • Write various types of raw material used in preparation of cement.

Leave a Comment

Your email address will not be published. Required fields are marked *