Past papers for the FSc part-one class board examination.

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chemistry past papers :

SHORT QUESTIONS:

past papers include short question/answers given below:

• Write names and symbol of an element from s-block that has zero oxidation state. Also, write its electronic configuration.
• Why melting and boiling points of elements belonging to groups VA-VllA lower?
• The solution of Na2O in water is alkaline, justify the statement.
• Define Metalloid. Give reactions of metalloid of group IIIA with oxygen.
• Give uses of lead suboxide.
• Show that H3BO3 is monobasic acid?
• How Al finds its uses in metallurgy and photoflash bulbs?
• Write formulas of chromate and dichromate ions. In which color they usually exist?
• Name three allotropic forms of phosphorous?
• How aqua-regia does dissolve gold?
• The elements of Vlll-A group are called noble gases. Comment
• Define noble gasses
• Why noble gases are rare?
• How halogen acids are ionized in the water?
• Define the homocyclic compounds, give an example.

Short questions:

• Define hybridization. Also, give some examples.
• What are fused rings aromatic compounds? Give an example.
• Predict the major product of bromination of nitrobenzene. Also, give some examples.
• Mention four uses of ethane
• Mention four uses of ethene
• What is the difference between ethane and ethene?
• Sigma bonds are inert in alkanes. Justify
• Discuss E mechanism?
• Write two uses of methanol and ethanol
• How will you distinguish between methanol and ethanol?
• Picric acid is a phenol which behaves like an acid. Is this true?
• Discuss how ethers belong to an inert class of organic compound.
• What are amino acids?
• Discuss the difference between acidic and basic amino acids?
• Explain one method of formation of formaldehyde from methyl alcohol. Explain with diagram.
• Give on reaction for the formation of an acetal.
• In what way oil and fats are different?
• Define Enzyme.
• Discuss the properties of the enzyme.
• Are classical elements essential for plant growth?
• Enlist steps involved in the manufacturing of urea.
• Write down a note on Diammonium phosphate

LONG QUESTIONS:

long questions considered as subjective part of past papers.

• What are acid rains? Give reasons.
• Explain periodic trends in the following physical properties: (i) Atomic Radius (ii) electron affinity.
• Describe eight points of role of lime in industries.
• Explain the reforming of petroleum with the help of a suitable example.
• What are SN reactions? Differentiate between different types of SN?
• Convert the following: (i) Propyne to acetone (ii) Ethyne into oxalic acid
• Discuss the reaction of ethanol and propanone with: (i) Hydroxylamine (ii) Phenyl Hydrazine
• Define Friedel Crafts Reactions. Give mechanism with an example of Friedel Craft’s Acylation Reaction?
• Define Zwitter ion. Discuss the effect of acidic and basic medium on the dipolar ion structure of amino acid.
• How steel can be manufactured by Bessemer’s Process?
• Explain the process of incineration of industrial waste.

read also: Topology | meaning | example

SHORT QUESTIONS:

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• Describe the 6^th period of the modern periodic table.
• The oxidation states vary in a period but remain constant in a group. Give reasons
• Why KO2 is used in breathing equipment’s for mountaineers and in spacecraft?
• Point out how Boron is different from its own group?
• Write names and formulas of four important boric acids.
• How weathering phenomena convert potassium feldspar into clay?
• How nitrogen dioxide is prepared from (a) Lead nitrate (b) Cu+HNO3?
• Justify the hydrosulphuric acid act as dehydrating agent by writing suitable equations.
• HF is weak acid while HI is a strong acid Give reason.
• What are Freon and Teflon?
• 2-butyne does not show geometrical isomerism but 2-butene does. Give reasons.
• Differentiate between alicyclic and aromatic compounds.
• Define Catenation?
• Convert benzene and acetophenone?
• Write the structural formula for two compounds (a) vinyl acetylene ?(b) But-3-en-1-yne
• How will you prepare 1-butanol using ethyl magnesium bromide?
• Give two methods for the preparation of phenol.

SHORT QUESTIONS:

• Distinguish between tertiary alcohol and primary alcohol as an example.
• Manipulate the term “Esterification” using ethyl alcohol as an example.
• Apply your knowledge to convert formaldehyde into ethyl alcohol
• Give a general mechanism of acid catalyzed addition reactions of aldehydes.
• Give chemical changes in two steps that occur by the addition of Tollen’s Reagent to an aldehyde in attest tube and heated.
• Define Epoxy Resins. Give their importance.
• Differentiate between fats and oils.
• Define the saponification number.
• Ammonium nitrate is a useful fertilizer for many crops except paddy rice. Why?
• Name four argillaceous materials used for the manufacturing of cement.
• Pulp formed by digestion is washed at the pulp washing stage. Why is it essential?
• Detergents are a threat to aquatic life. Explain.

LONG QUESTIONS:

• Discuss the various period in the modern periodic table.
• Explain the construction of Down’s cell. Give reactions taking place at cathode and anode.
• What is meant by reforming of petroleum? Explain knocking and octane number in regards.
• Explain: (a) Nucleophile (b) Electrophile (c) Substance (d) Leaving group.
• How does ethyne react with Hydrogen and Alkaline?
• Distinguish between (i) Butanone and 3-Pentanone (ii) Acetaldehyde and Benzaldehyde
• Write down the mechanism of the reactions between acetic acid and ethanol.
• Distinguish between cathode coating and anode coating of iron.
• Write down the effects of acid rain.