Chemia 2nd year guess paper 2022

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“CHEMISTRY GUESS SHORT QUESTIONS”
“INTERMEDIATE PART 2”
● What is lanthanide contraction?
● Write two differences of Be with its family members
● Name various classes of hydrides.
● Why does metallic character increase from top to bottom in a group of metals?
● Alkali metals give ionic hydrides. Why?
● Give four uses of nitric acid.
● Oxidation state usually remains the same in a group. Why?
● Give any two similarities and two differences of hydrogen with the IVA group.
● Why 2% gypsum added to cement?
● Give reaction of P2O5 with cold and hot water
● The aqueous solution of borax is alkaline. Give a reason. (2)
● What is carbonization?
● Explain the structure of CO2.
● Write carbon content in pig iron and wrought iron.
● Write two uses of sodium silicate. (2)
● How can borax be prepared from colemanite? Give equation
● Write names and formulas of oxyacids of nitrogen.
● What is iodized salt?
● Write any two uses of Krypton.
● What are Freons and Teflon?
● Describe two uses of helium.
● Why does the solubility of noble gases increase down the group?
● Why do the elements of group VIA other than oxygen show more than two oxidation
states?
● Write down two chemical equations that show that H2SO4 is a dehydrating agent.
● Describe chromyl chloride test for chloride radical. Also, write the chemical equation
in support of your answer. (2)
● How has the octane number of gasoline been improved? Explain with examples.
● What are aromatic compounds? Explain with examples.
● Explain Markownikov’s rule with suitable examples. (2)
● Convert ethyne into acetaldehyde.
● Convert acetaldehyde into lactic acid.
● Give mechanism of nitration of benzene.
● Give reaction of benzene with ozone.
● What are alicyclic compounds? Give two examples.
● What are heterocyclic compounds?
● What is leaving group and substrate?
● Give reaction of Grignard’s reagent with CO2 followed by hydrolysis in acid medium.
● Give the mechanism of the SN1 reaction.
● Convert acetone into ethyl alcohol.
● Prepare acetone from calcium acetate.
● Write four uses of ethyl alcohol.
● How primary, secondary and tertiary alcohols are identified?
● Water has a higher boiling point than ethanol. Explain.
● What is chemical oxygen demand? (2)
● Explain purification of water by use of the coagulating agent.
● Define sacrificial corrosion.
● Write the reaction of phenylhydrazine with acetaldehyde and acetone.
● What is Fehling’s solution test to identify the aldehyde?
● Write the functional group of aldehyde and ketone, give one example of each.
● Write the formula of glycine and alanine.
● How cis and trans alkalis are produced? Give reactions.
● How amino acid is prepared by the Strecker method?
● Define a saponification number. Give an example. (2)
● What is the difference between DNA and RNA?
● Define iodine number.
● Why does iodine have a metallic lustre?
● What reaction takes place in the decomposition zone during manufacturing of
cement?
● Which type of wood raw material is used in the paper industry?
● Write two woody and two nonwoody raw materials for paper pulp manufacture.
● How is acetylene converted into benzene? Give an equation. (2)
● Define resonance energy. Give resonance energy of benzene.
● How is benzene converted into maleic acid by catalytic oxidation?
● How will you prepare diethyl amine from C2H5Br?
● How will you distinguish between methanol and ethanol by one test?
● Why is phenol acidic in nature?
● Write structure of cholesterol.
● What is peptide bond? Write the formula of a dipeptide.
● What are macronutrients?
● What is the role of chlorofluorocarbons in destroying ozone?
● Write names of components of the environment.
● What is depolymerization of carbon? Where is it used?
● Describe preparation of formalin on a commercial scale from methyl alcohol.
● Tollen’s test is also called the silver mirror test. Justify it.
● Define neutral amino acids with an example.
● How is carboxylic acid converted into a-amino acids?
● Define with example condensation of polymerization.
● What do you mean by rancidity of oils and fats? Why does it occur? (2)
● What is the need for fertilizers?
● What do you mean by prilling of urea