General Principles and Processes of Isolation of Elements HOTs Class 12 Chemistry

MULTIPLE CHOICE QUESTIONS (MCQ) (1 Mark) Question. Which process is generally used for the concentration of sulphide ores(a) Hydraulic Washing(b) Magnetic Separation(c) Froth Flotation(d) Distillation Question. Which reducing agent is employed to get copper from leached low grade copper ore.(a) N2(b) H2(c) Coke(d) CO Question. Silica is used as a flux in the extraction of Metals which is an example of(a) Basic(b) Neutral(c) Acidic(d) Amphoteric Question. Name […]

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Biomolecules HOTs Class 12 Chemistry

Question. Isomerization of glucose produces(a) galactose(b) fructose(c) mannose(d) allose Question. Biomolecules are(a) aldehydes and ketones(b) acids and esters(c) carbohydrates, proteins and fats(d) alcohols and phenols Question. Which of the following is a disaccharide ?(a) Lactose(b) Starch(c) Cellulose(d) Fructose Question. Invert sugar is(a) chemically inactive form of sugar(b) equimolecular mixture of glucose and fructose(c) mixture of glucose and sucrose(d) a […]

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Amines HOTs Class 12 Chemistry

Question. In the reaction, (a) NH3(b) N2(c) O2(d) CO2 Question. Amines behave as(a) lewis acids(b) lewis bases(c) aprotic acids(d) amphoteric compounds Question. What is the IUPAC name of the following compound ? (a) 2-methyl-4-hexanamine(b) 5-methyl-3-hexanamine(c) 2-methyl-4-amino hexane(d) 5-methyl-3-amino hexane Question. Which of the following statement is correct ?(a) Ammonia is more basic than methylamine.(b) Methylamine is more […]

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Alcohols Phenols and Ethers HOTs Class 12 Chemistry

Question. Sodium salt of benzene sulphonic acid on fusion with caustic soda gives(a) Benzene(b) Phenol(c) Thiophenol(d) Benzoic acid Question. Which of the following is dihydric alcohol ?(a) Glycerol(b) Ethylene glycol(c) Catechol(d) Resorcinol Question. Acid catalyzed hydration of alkenes except ethene leads to the formation of(a) primary alcohol(b) secondary or tertiary alcohol(c) mixture of primary and secondary alcohols(d) […]

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Haloalkanes and Haloarenes HOTs Class 12 Chemistry

CRITICAL THINKING TYPE QUESTIONS  Question. Which of the following statements is correct?(a) SN2 reactions of optically active halides are accompanied by inversion of configuration.(b) SN1 reactions of optically active halides are accompanied by racemisation.(c) Carbocation formed in SN1 reaction is sp2 hybridized.(d) All of the above.  Question. A compound is formed by substitution of two chlorine for […]

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