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1. Choose the correct option. Question A.Which of the following is not an allotrope of carbon?a. buckyballb. diamondc. graphited. emeraldAnswer:d. emerald Question B.………… is inorganic graphite.a. boraxb. diboranec. boron nitrided. colemaniteAnswer:c. boron nitride Question C.Haber’s process is used for the preparation of ………….a. HNO3b. NH3c. NH2CONH2d. NH4OHAnswer:b. NH3 Question D.Thallium shows a different oxidation state … Read more

1. Explain the following Question A.Hydrogen shows similarity with alkali metals as well as halogens.Answer: Hence, hydrogen shows similarity with alkali metals as well as halogens. Question B.Standard reduction potential of alkali metals have high negative values.Answer: Hence, standard reduction potentials of alkali metals have high negative values. Question C.Alkaline earth metals have low values … Read more

1. Explain the following Question A.The elements Li, B, Be and N have the electronegativities 1.0, 2.0, 1.5, and 3.0, respectively on the Pauling scale.Answer: Hence, the elements Li, B, Be and N have the electronegativities 1.0, 2.0, 1.5, and 3.0, respectively on the Pauling scale. Question B.The atomic radii of Cl, I and Br … Read more

1. Choose the most correct option Question A.Oxidation numbers of Cl atoms marked as Cla and Clb in CaOCl2 (bleaching powder) are a. zero in eachb. -1 in Cla and +1 in Clbc. +1 in Cla and -1 in Clbd. 1 in eachAnswer:b. -1 in Cla and +1 in Clb Question B.Which of the following is not an example of redox … Read more

Chapter 5 Chemical Bonding 1. Select and write the most appropriate alternatives from the given choices. Question A.Which molecule is linear?a. SO3b. CO2c. H2Sd. Cl2OAnswer:b. CO2 Question B.When the following bond types are listed in decreasing order of strength (strongest first). Which is the correct order?a. covalent > hydrogen > van der waalsb. covalent > … Read more

1. Choose the correct option. Question A.The energy difference between the shells goes on ……….. when moved away from the nucleus.a. Increasingb. decreasingc. equalizingd. staticAnswer:b. decreasing Question B.The value of Plank’s constant isa. 6.626× 10-34 Jsb. 6.023× 10-24 Jsc. 1.667 × 10-28 Jsd. 6.626× 10-28 JsAnswer:a. 6.626× 10-34 Js Question C.p-orbitals are ……. in shape.a. sphericalb. dumbbellc. double dumbbelld. diagonalAnswer:b. … Read more

1. Choose the correct option Question A.Which of the following methods can be used to separate two compounds with different solubilities in the same solvent?a. Fractional crystallizationb. Crystallizationc. Distillationd. Solvent extractionAnswer:a. Fractional crystallization Question B.Which of the following techniques is used for the separation of glycerol from soap in the soap industry?a. Distillation under reduced … Read more

1. Choose the correct option Question A.The branch of chemistry which deals with the study of separation, identification, and quantitative determination of the composition of different substances is called………………..a. Physical chemistryb. Inorganic chemistryc. Organic chemistryd. Analytical chemistryAnswer:d. Analytical chemistry Question B.Which one of the following property of matter is Not quantitative in nature ?a. Massb. … Read more

1. Choose the most correct option. Question A.A sample of pure water, whatever the source always contains …………. by mass of oxygen and 11.1 % by mass of hydrogen.a. 88.9b. 18c. 80d. 16Answer:a. 88.9 Question B.Which of the following compounds can NOT demonstrate the law of multiple proportions?a. NO, NO2b. CO, CO2c. H2O, H2O2d. Na2S, … Read more

Textbook Questions and Answers Character: Question 1.Mayor Peter Stockmann is a contrast to Dr. Thomas Stockmann. Justify.Answer:There are lots of good things you can say about Dr. Stockmann, the protagonist of ‘An Enemy of the People’. He is an idealist and a man having great love and care for his family. He is generous with … Read more