All Students Notes

Analytical Chemistry MCQs and Answers with explanation 1. Which of the following techniques does not involve electronmagnetic radiations a) infrared spectroscopy b) NMR spectroscopy c) mass spectrometry d) all of these involve electronmagnetic radiations ... Answer is c) Explanation: In mass spectrometry, high energy (70 ev) beam of electrons is used to produde moleular and fragment ions. . show Answer 2. Which region of the electromagnetic spectrum is involved in the electronic excitations? a) ultravoilet spectroscopy b) visible spectroscopy c) electronic spectroscopy d) none of these ... Answer is c) Explanation: Both of ultravoilet and visible spectroscopy are based on excitation of electrons from ground to excited state. show Answer 3. Which of the following tecniques is different from the others as regarded as the basic principle? a) ultravoilet spectroscopy b) visible spectros...

Environmental Chemistry MCQs and Answers with explanation 1. Air is polluted by a) toxic materials b) hydrocarbons c) harmful gases d) all of above ... Answer is d) Explanation: Any substance that is present in air and has adverse effect on a part of atmosphere is known as air pollutant. Examples of air pollutant are toxic material, toxic gases and hydrocarbon. Hydrocarbons are considered as major source of air pollution due to their incomplete combustion. show Answer 2. Which of the following gas in not pollutant? a) SO 2 b) CO c) CO 2 d) NO 2 ... Answer is c) Explanation: CO 2 is not considered as air pollutant as human exhale it and plants inhale it and utilize it for photosynthesis. Although, its excessive amount causes global warming, yet it is not known as air pollutant. show Answer 3. Oxides of sulfur and nitrogen react with oxygen to form a) bases b) acids c) sa...

Industrial chemistry MCQs and Answers with explanation 1. The branch of chemistry which applies physical and chemical procedures towards the transformation of natural raw material and their derivatives to products is called a) physical chemistry b) classical chemistry c) industrial chemistry d) both b and c ... Answer is c) Explanation: Industrial chemistry is related to application of physical and chemical procedure for manufacturing of various prouducts that are useful for humanity. show Answer 2. Which dy is used in boot polish? a) azo dye b) congo dye c) methyl orange d) bismarck brown ... Answer is d) Explanation: Bismarck brown is used in boot polish dye. show Answer 3. Miticides are used to control a) ticks and mites b) fungi c) unwanted plants d) mice and bats ... Answer is a) Explanation: Miticide is any substance that is used to kill ticks and mites...

Biochemistry MCQs and Answers with explanation 1. Biochemistry covers the practical applications of a) medicine b) agriculture c) nutrition d) all of these ... Answer is d) Explanation: Biochemistry is the branch of chemistry that deals with physical and chemical changes occuring in the living oranism. All of these are involved in living organism. . show Answer 2. Macromolecules are of how many types? a) three b) four c) five d) six ... Answer is b) Explanation: Macromolecules are of four types. These are carbohydrates, proteins, lipids and nucleic acid. show Answer 3. The general formula for carbohydrates is a) N n (H 2 O) n b) P n (H 2 O) n c) C n (H 2 O) n d) H n (CO 2 ) n ... Answer is d) Explanation: Consider an example of glucose. Its chemical formula is C 6 H 12 O 6 . So, it can be written as C 6 (H 2 O) 6 OR C n (H 2 O) n show Answer 4. Mo...

Carboxylic acids MCQs and Answers with explanation 1. A carboxylic acid contains functional group a) a hydroxyl group b) a carboxyl group c) a hydroxyl and carboxyl group d) a carboxyl and aldehyde group ... Answer is b) Explanation: Carboxylic acid is a class of compounds which have carboxyl group (COOH) as a functional group. show Answer 2. From the following carboxylic acids which acid has higher acidity a) ethanoic acid b) propanoic acid c) chloroethanoic acid d) nitroethanoic acid ... Answer is d) Explanation: Acidity of an acid depends upon the stability of its conjugate base. As conjugate base of nitroethanoic acid is highly stable (due to strong electron withdrawing effect of nitro group), so it is the strongest acid among the given options. show Answer 3. which reagent is used to reduce a carboxylic acid? a) He/Ni b) H 2 /Pt c) NaBH 4 d) LiAlH 4 ... Ans...