Description : The hydrolysis of a fat using a solution of a strong hydroxide is called: w) neutralization x) esterification y) saponification z) condensation
Last Answer : ANSWER: Y -- SAPONIFICATION
Description : What is the process by which an atom gains electrons? w) Reduction x) Neutralization y) Electrolysis z) Oxidation
Last Answer : ANSWER: W -- REDUCTION
Description : Alcohol is produced by the (A) Oxidation of an aldehyde (B) Hydrolysis of an ether (C) Esterification of a fat (D) None of these
Last Answer : (B) Hydrolysis of an ether
Description : The action of concentrated sulfuric acid on sugar best described as: w) catalysis x) oxidation y) reduction z) dehydration
Last Answer : ANSWER: Z -- DEHYDRATION
Description : Which of the following reactions involve NEITHER oxidation nor reduction? w) burning antimony in chlorine x) decomposition of potassium chlorate y) reaction of sodium with water z) reaction of potassium hydroxide with nitric acid
Last Answer : ANSWER: Z -- REACTION OF POTASSIUM HYDROXIDE WITH NITRIC ACID
Description : An aldehyde can be oxidized to form: w) a ketone x) an acid y) an alcohol z) an ester
Last Answer : ANSWER: X -- AN ACID
Description : Cyclohexanone is an example of: w) an aldehyde x) a carboxylic acid y) an alkyne z) a ketone
Last Answer : ANSWER: Z -- A KETONE
Description : A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number? (1) C (2) S (3) H (4) Cl
Last Answer : Cl
Description : A cobalt chloride solution soaked into a piece of cotton can be used as an indicator for changes in humidity levels. Pink indicates a high-humidity environment and blue a low-humidity environment. What ... the cobalt's waters of hydration. z) This is an illustration of the Schrodinger principle.
Last Answer : ANSWER: Y -- THE LOSS AND READSORPTION OF THE COBALT'S WATERS OF HYDRATION.
Description : Why do aldehydes undergo nucleophilic addition reactions while esters undergo nucleophilic acyl substitution reactions? (a) The carbonyl carbon of an ester is more electrophilic than that of an aldehyde. (b) ... adds to an aldehyde, neither H− nor R− can be eliminated since they are strongly basic
Last Answer : Once the nucleophile adds to an aldehyde, neither H− nor R− can be eliminated since they are strongly basic
Description : When a radioisotope undergoes beta minus decay, does its atomic number: w) increase x) decrease y) remain the same z) vary depending on the element involved
Last Answer : ANSWER: W -- INCREASE
Description : 0.257g of organic substance was heated with conc. sulphuric acid and then distilled with excess of strong alkali .the ammonia gas evolved was absorbed in 50ml of .1M HCl which required 23.2ml of c for neutralization at the end of the process. Determine the % of nitrogen in the compound ?
Last Answer : A. Vol of 0 .1M HCl taken = 50ml Vol of .1MNaOH used for neutralization of unused acid=23.2ml Now, 23.2 ml of .1MNaOH =23.2ml of .1MHCl Vol of .1MHCl unused=23.2ml Vol of .1MHCl required ... NH3 solution contain nitrogen = 14*26.8/10*1000 Percentage of Nitrogen=14*26.8*100/10*1000*.257 =14.6%
Description : In the above chemical reaction which element does undergo oxidation and which does undergo reduction?
Last Answer : 2Na(s) + H2(g) \(\overset{\Delta}\longrightarrow\) 2NaH(s) In the above ... element does undergo oxidation and which does undergo reduction?
Description : Explain following unit processes with suitable example. (i) Sulphonation (ii) Hydrogenation (iii) Esterification
Last Answer : (i) Sulfonation reactions : It is the reaction with sulfuric acid to introduce sulfonic (SO3H) group into a compound. (ii) Hydrogenation: Hydrogenation may be defined as the chemical ... of ethyl acetate. Sulphuric acid and hydrochloric acids are the catalysts used for esterification.
Description : A body which is attached to a spring undergoes simple harmonic motion. The magnitude of the body's acceleration is: w) constant x) proportional to its displacement from its equilibrium position y) zero z) always increasing.
Last Answer : ANSWER: X -- PROPORTIONAL TO ITS DISPLACEMENT FROM ITS EQUILIBRIUM POSITION
Description : When an atom undergoes beta decay, the atomic number of the nucleus: w) is unchanged x) increases by one y) decreases by one z) none of the above
Last Answer : ANSWER: X -- INCREASES BY ONE
Description : A beam of white light is passed through a diffraction grating and the resulting spectrum is allowed to fall on a screen. Which one of the following is the color of light that undergoes the greatest deviation from its original direction. Is it: w) red x) yellow y) blue z) violet
Last Answer : ANSWER: W -- RED
Description : The principle behind a breeder reactor is: w) U-235 undergoes fission. x) U-238 is converted to Pu-239, which undergoes fission. y) Deuterium undergoes fission. z) Cobalt-60 undergoes fission.
Last Answer : ANSWER: X -- U-238 IS CONVERTED TO Pu-239, WHICH UNDERGOES FISSION.
Description : Isobaric processes take place at constant: w) temperature x) volume y) pressure z) energy
Last Answer : ANSWER: Y -- PRESSURE
Description : . The reduction of cyclohexanone with LiAlH4 (or NaBH4) will give (a) an alcohol (b) an organic acid (c) an aldehyde (d) a hemiketal
Last Answer : an alcohol
Description : Benzaldehyde does not react with (a) Tollens' reagent (b) Phenylhydrazine (c) Fehling's solution (d) NaHSO3
Last Answer : Fehling's solution
Description : The reagent that can be used to differentiate an aldose and a ketose is : (a) Bromine water (b) Fehling's solution (c) Tollens' reagent (d) None of these
Last Answer : Bromine water
Description : Which of the following statements is false about sucrose? (a) It is also called table sugar. (b) It may be fermented by yeast to produce alcohol. (c) It reduces Fehling's solution. (d) It does not reduce Tollens' reagent.
Last Answer : It reduces Fehling's solution
Description : Acetaldehyde on treatment with Fehling's solution gives a precipitate of (a) Cu (b) Cu2O (c) CuO (d) None of these
Last Answer : Cu2O
Description : Which of the following compounds will give a positive test with Fehling's solution? (a) Formaldehyde (b) Acetone (c) Ethyl acetate (d) Acetic acid
Last Answer : Formaldehyde
Description : Saponification: (A) Hydrolysis of fats by alkali (B) Hydrolysis of glycerol by liposes (C) Esterification (D) Reduction
Last Answer : Answer : A
Description : An organic compound (A), C3H8O, on oxidation gives (B), C3H6O. The compound (A) could be (a) an aldehyde (b) a ketone (c) an alcohol (d) an ester
Description : Oxidation of a secondary alcohol with K2Cr2O7/H+ produces (a) a carboxylic acid (b) a ketone (c) an aldehyde (d) an ester
Last Answer : a ketone
Description : Which of the following is the primary reason for adding calcium carbonate to the reduction process of iron oxide ores ? The calcium carbonate: w) acts as an oxidizing agent x) removes silicate waste products y) acts as a reducing agent z) removes sulfur waste products
Last Answer : ANSWER: X -- REMOVES SILICATE WASTE PRODUCTS
Description : Mineral acids are also classified as: w) carboxyl acids x) inorganic acids y) non-electrolytic acids z) oxidation acids
Last Answer : ANSWER: X -- INORGANIC ACIDS
Description : Which of the following metals is least subject to oxidation? w) silver x) gold y) magnesium z) nickel
Last Answer : ANSWER: X -- GOLD
Description : The oxidation number of chlorine in KClO4 is: w) -1 x) +3 y) +7 z) +1
Last Answer : ANSWER: C -- +7
Description : Vegetable oil is made into margarine through: w) halogenation x) partial hydrogenation y) methylation z) oxidation
Last Answer : ANSWER: X -- PARTIAL HYDROGENATION
Description : The oxidation number of N in NaNO2 is: w) +5 x) +2 y) +3 z) -3
Last Answer : ANSWER: Y -- +3 (Accept 3)
Description : Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere? (a) Aerobic nitrate oxidation and nitrite reduction (b) ... fixation by Rhizobium in root nodules of legumes (d) Anaerobic ammonium oxidation and denitrification
Last Answer : (d) Anaerobic ammonium oxidation and denitrification
Description : Which of the following processes is involved in the biochemical treatment of sewage effluents? (A) Oxidation (B) Reduction (C) Dehydration (D) Fermentation
Last Answer : (A) Oxidation
Description : Four identical samples of a metal are heated to different temperatures. Based on the colors of their incandescences, which sample is the hottest? The sample that is: w) blue-white x) bright red y) yellow z) orange
Last Answer : ANSWER: W -- BLUE-WHITE
Description : Which pot of water will boil LAST when all are heated by the same source? w) aluminum pot x) iron pot y) brass pot z) titanium pot
Last Answer : ANSWER: Z -- TITANIUM POT
Description : When a solid material is heated, it always: w) emits a discrete radiation spectrum x) glows red y) emits a continuous radiation spectrum z) emits only visible radiation
Last Answer : ANSWER: Y -- EMITS A CONTINUOUS RADIATION SPECTRUM
Description : If a metallic object is heated, its density generally: w) increases x) decreases y) fluctuates randomly z) remains the same
Last Answer : ANSWER: X -- DECREASES
Description : Which of the following processes doesn't account for an increase in atmospheric CO2 (carbon dioxide) levels? w) deforestation x) photosynthetic processes y) plant respiration z) fossil fuel combustion
Last Answer : ANSWER: X -- PHOTOSYNTHETIC PROCESSES
Description : The Greenhouse Effect is caused primarily by which of the following processes? w) blocking incoming short wave solar energy x) absorbing incoming short wave solar energy y) heating of the Earth's stratosphere z) absorbing outgoing long wave radiation from the Earth
Last Answer : ANSWER: Z -- ABSORBING OUTGOING LONG WAVE RADIATION FROM THE EARTH
Description : It is a common observation that naturally occurring processes have a particular direction associated with them. For instance, heat flows from a hot body to a colder body. The property of a system ... this natural direction of events is called w) energy x) entropy y) enthalpy z) equilibrium
Last Answer : ANSWER: X -- ENTROPY
Description : When petroleum is refined it is subject to a number of processes including cracking. During the cracking process w) lighter hydrocarbons are combined to form heavier ones x) heavy hydrocarbons ... lighter hydrocarbons are separated by distillation z) oxygen is used to burn the heavier hydrocarbons
Last Answer : ANSWER: X -- HEAVY HYDROCARBONS ARE BROKEN UP INTO LIGHTER ONES
Description : The reagent used to test the presence of starch in leaves is – (1) Fehling's solution (2) Iodine solution (3) Million's reagent (4) Benedict's solution
Last Answer : (2) Iodine solution Explanation: The Iodine test is used to test for the presence of starch. Iodine solution — iodine dissolved in an aqueous solution of potassium iodide — reacts with the starch producing a purple black color.
Description : Which one of the following reacts with Fehling’s solution?
Last Answer : HCHO
Description : The colour observed when hydrochloric acid and Fehling’s solution is added to test sugar
Last Answer : is reddish.
Description : Which one of the following reacts with Fehling's solution?
Description : The reagent used to test the presence of starch in leaves is (1) Fehling’s solution (2) Iodine solution (3) Million’s reagent (4) Benedict’s solution
Last Answer : Iodine solution
Description : An aqueous solution of glucose behaves as an aldehyde because __________. (a) it is hydrolyzed by water to the free aldehyde (b) it is a ketone, but is in equilibrium with the aldehyde form ... aldehyde (d) its cyclic hemiacetal, the predominant form, is in equilibrium with the free aldehyde form
Last Answer : its cyclic hemiacetal, the predominant form, is in equilibrium with the free aldehyde form