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Important Short Questions Chemistry Guess Paper of 2nd year

Important Short Questions Chemistry Guess Paper of 2nd year

What is lanthanide contraction?
Write two differences of Be with its family members
Name various classes of hydrides.
Why metallic character increases 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 same in a group. Why?
Give any two similarities and two difference of hydrogen with IVA group.
Why 2% gypsum is added to cement?
Give reaction of P2O5 with cold and hot water
The aqueous solution of borax is alkaline. Give 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 borax can 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 solubility of noble gases increases down the group?
Why 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 octane number of gasoline is improved? Explain with example.
What are aromatic compounds? Explain with examples.
Explain Markownikov’s rule with suitable example. (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 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 Strecker method?
Define saponification number. Give example. (2)
What is the difference between DNA and RNA?
Define iodine number.
Why iodine has metallic luster?
What reaction takes place in decomposition zone during manufacturing of cement?
Which type of wood raw material is used in paper industry?
Write two woody and two nonwoody raw material for paper pulp manufacture.
How acetylene is converted into benzene? Give equation. (2)
Define resonance energy. Give resonance energy of benzene.
How benzene is converted into maleic acid by catalytic oxidation?
How will you prepare diethyl ammine from C2H5Br?
How will you distinguish between methanol and ethanol by one test?
Why phenol is acidic in nature?
Write structure if cholesterol.
What us 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 it is used?
Describe preparation of formalin on a commercial scale from methyl alcohol.
Tollen’s test is also called silver mirror test. Justify it.
Define neutral amino acids with an example.
How carboxylic acid is converted into a-amino acids?
Define with example condensation of polymerization.
What do you mean by rancidity of oils and fats? Why it occurs? (2)
What is the need for fertilizers?
What do you mean by prilling of urea?

Chemistry Guess Paper of 2nd year


Explain the peculiar behavior of beryllium.
Write two similarities and two dissimilarities of hydrogen with IA group of an element. (alkali metals)
Write two similarities and two dissimilarities of hydrogen with IVA group of the element.
Complete and balance the following equations
i. Li2O + H2O ii. Na2O + H2O à iii. Mg + (OH)2 iv. NaNO3
Write a note on aluminum silicate.
Write a method for preparation of water glass. Also, write uses of water glass.
Write any four applications of noble gases.
Write uses of neon and argon.
Explain the β elimination reaction ‘E2’ with an example
Explain Sp3 mode of hybridization with an example.
Define sp hybridization. Explain it with example of ethyne.
Explain nucleophilic substitution bimolecular SN2 mechanism of alkyl halides.
Discuss acidic nature of alkynes with examples.
Write a note on halogenations of alkalis
What are aldols? Explain aldol condensation reaction mechanism for condensation of ethanol.
Write any four chemical methods for preparation of benzene.
Give reactions of benzene with respect to i. Nitration ii. Sulphonation (2)
Give the reaction of phenol with i. HNO3 ii. H2SO4 iii. NaOH iv. Zn v. CH3COCL vi. H2
Write chemical reaction of ethene with the following: i. HCl ii. Br2 iii.O3 iv. HOX
Write four uses of acetaldehyde.
What happens when following compounds are heated?
Ammonium acetate ii. Calcium acetate
Write formulas of Beryl ii. Asbestos ii. Magnetite iv. Haematite v. Formaldehyde vi. Acetaldehyde.
What are phosphatic fertilizers? How are they prepared? Mention the role of phosphorus in the growth of plants.

How is Urea manufactured in Pakistan. Describe the detailed process.
Write down the essential qualities of a good fertilize.

Important short questions of Chemistry 2nd Year

Important long questions of Chemistry 2nd year


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