Description : Millaer and Urey performed an experiment to prove the origin of life. They took gases `NH_(3) and H_(2)` along with :
Last Answer : Millaer and Urey performed an experiment to prove the origin of life. They took gases `NH_(3) and H_(2)` along ... and N_(2)` D. `CO_(2) and NH_(3)`
Description : From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask. (a) CH4, H2, NH3 and water vapor at 800°C (b) CH3, H2, NH4 and water vapor at 800°C (c) CH4, H2, NH3 and water vapor at 600°C (d) CH3, H2, NH3 and water vapor at 600°C
Last Answer : a) CH4, H2, NH3 and water vapor at 800°C
Description : Which was absent in the atmosphere at the time of origin of life? (a) NH3 (b) H2 (c) O2 (d) CH4
Last Answer : O2
Description : What is the maximum amount of NH3 gas formed by mixing of 14 g N2 and 6 g H2 gases is?
Last Answer : N2(g) + 3H2(g) ==> 2NH3(g) is the balanced equation for thisreaction.14 g N2 x 1 mole N2/28 g = 0.5 moles N2 present6 g H2 x 1 mole H2/2 g = 3 moles O2 presentIn this situation, the amount of N2 ... by the amount of N2.0.5 moles N2 x 2 moles NH3/1 mole N2 = 1 moles NH3 is themaximum amount of NH3.
Description : The Theory of Inheritance of Acquired Characters for the origin of species was proposed by: (a) Jean Lamark (b) J.B.S. Haldane (c) August Weismann (d) Harold Urey
Last Answer : Ans:(a)
Description : In 1953 S.L. Miller created primitive earth conditions in the labortory and gave experimental evidence for origin of first form of life from pre-exist
Last Answer : In 1953 S.L. Miller created primitive earth conditions in the labortory and gave experimental evidence ... atmosphere containing `CH_(4)NH_(3)` etc.
Description : 6. In 1953 S L Miller created primitive earth conditions in the laboratory and gave experimental evidence for origin of first form of life from pre existing non living organic molecules. The ... -reducing atmosphere. d) High temperature, volcanic storms, reducing atmosphere and contains NH3 and CH4
Last Answer : d) High temperature, volcanic storms, reducing atmosphere and contains NH3 and CH4
Description : In the experiment of Stanely Miller the temp. of water vapour was :
Last Answer : In the experiment of Stanely Miller the temp. of water vapour was : A. `1200^(@)C` B. `1000^(@)C` C. `800^(@)C` D. `1500^(@)C`
Description : Stanley miller observed the formation of ______ during the experiment.
Last Answer : Stanley miller observed the formation of ______ during the experiment. A. Nuclei Acid B. Nucleotides C. Amino acid D. Polypeptide
Description : S.L. Miller an American scientist created electric discharge experiment in a closed flask containing `CH_(4),H_(2),NH_(3)` and water vapour at what te
Last Answer : S.L. Miller an American scientist created electric discharge experiment in a closed flask containing `CH_(4),H_(2),NH_ ... . `200^(@)C` D. `1000^(@)C`
Description : Rove failed to show before congress, again. Is it really a case of national security?
Last Answer : Actually I’m pretty sure it is a case of Rove being a complete idiot and quite possibly the anti-Christ.
Description : How many moles of H2 and N2 can be formed by the decomposition of 0.145 moles of ammonia, NH3?
Last Answer : All together now… WE WILL NOT DO YOUR HOMEWORK
Description : Coke oven gas burns with a yellowish flame, because of the presence of (A) CO2 (B) CH4 (C) H2 (D) NH3
Last Answer : (B) CH4
Description : Raw materials for urea production are (A) CO2 and N2 (B) CO2 , H2 and N2 (C) NH3 and CO (D) HNO3 and CaCO3
Last Answer : (B) CO2 , H2 and N2
Description : . Shift conversion reaction (A) Converts N2 and H2 into NH3 (B) Converts CO to CO2 with steam (C) Is non-catalytic (D) Is highly exothermic
Last Answer : (B) Converts CO to CO2 with steam
Description : The reagent needed to convert 2-butyne to cis-2-butene is : (a) H2/Pt (b) H2/Lindlar’s catalyst (c) Li/NH3 (d) Na/NH3
Last Answer : H2/Lindlar’s catalyst
Description : Which of the following is a nonpolar molecule? (a) HCl (b) CH3Cl (c) H2 (d) NH3
Last Answer : H2
Description : Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits. (a) 02, N2, steam, C02 (b) Oz, N2, water vapour (c) S02, NH3, C02, moisture (d) 02, N2, H2, air (e) steam vapours, H2, C02.
Last Answer : Answer : d
Description : Major gaseous pollutant of the thermal power station is (1) H2 S (2) NH3 (3) NO2 (4) SO2
Last Answer : SO2
Description : Harold Clayton Urey, an American, received the 193 Nobel Prize in chemistry for his discovery of: w) Francium x) Americium y) deuterium z) protium
Last Answer : ANSWER: Y -- DEUTERIUM
Description : Acid rains are due to which of the following gases? (a) CO2 and CO (b) Ozone and CO2(c) NO2 and SO2 (d) NH3 and CO2
Last Answer : (c) NO2 and SO2
Description : A charged particle P leaves the origin with speed `v=v_0` at some inclination with the x-axis. There is a uniform magnetic field B along the x-axis. P
Last Answer : A charged particle P leaves the origin with speed `v=v_0` at some inclination with the x-axis. There is ... 0)` C. Both are correct D. Both are wrong
Description : Ivan Pavlov performed experiments on (a) simple reflexes (b) conditioned reflexes (c) cardiac reflexes (d) origin of life.
Last Answer : (b) conditioned reflexes
Description : Origin of life took placee in which of the following era:
Last Answer : Origin of life took placee in which of the following era: A. Mesozoic B. Plaeozoic C. Precambrian D. Proterozoic
Description : Girdling experiment was first performed by -Biology
Last Answer : answer:
Description : Why girdling experiment is not performed in monocots? -Biology
Description : Transformation experiment was first performed on which bacteria? (a) E. coli (b) Diplococcus pneumoniae (c) Salmonella (d) Pasteurella pestis
Last Answer : b) Diplococcus pneumoniae
Description : Newton's rings experiment is performed and radius (or diameter) is calculated. Now Plano-convex lens is replaced with another Plano-convex lens of greater Radius of curvature. What will be effect on radius ( ... ) will increase (c) Radius (or diameter) will decrease (d) There will be no effect
Last Answer : (b) Radius (or diameter) will increase
Description : Newton's rings experiment is performed with air gap between lens and plate. Now that gap is filled with water. What will be effect on radius (or diameter)? (a) Radius (or diameter) will remain ... or diameter) will increase (c) Radius (or diameter) will decrease (d) There will be no effect
Last Answer : (c) Radius (or diameter) will decrease
Description : Ringing experiment was first performed by: a. Godlewski b. Strasburger c. Hartig d. J.C.Bose
Last Answer : c. Hartig
Description : Along with CO2, NH3 and ATP, the amino acid that is needed in urea cycle is (A) Alanine (B) Isoleucine (C) Aspartate (D) Glycine
Last Answer : Answer : C
Description : Recently a group of scientists successfully cloned eight calves from the cells of a single cow. The experiment took place in: A. Japan B. Britain C. Switzerland D. USA
Last Answer : ANSWER: B
Description : Which of the following gases will effuse out of football bladder most wieldy? (1) He (2) H2 (3) N2 (4) 02
Last Answer : (2) H2 Explanation: Hydrogen is a chemical element with symbol H and atomic number 1. With an average atomic weight of 1.00794 u (1.007825 u for hydrogen-1), hydrogen is the lightest ... forms covalent compounds with most elements and is present in the-water molecule and in most organic compounds.
Description : Which of the following gases makes bread or cake rise making them soft and spongy? (1) CO (2) H2 (3) CO2 (4) O2
Last Answer : (3) CO2 Explanation: Breads rise due to the process of fermentation, a chemical process by which molecules such as glucose are broken down an aerobically.
Description : Which of the following gases has very high neutron capture crosssection, making it unsuitable as a coolant in nuclear reactor? (A) N2 (B) He (C) CO2 (D) H2
Last Answer : (A) N2
Description : In an ammonia plant, the purge off is essential to (A) Maintain inert gas concentration within a limit (B) Remove excess poisonous gases (C) Maintain H2 : N2 ratio at 3 :1 (D) Remove uncondensed ammonia vapour
Last Answer : (C) Maintain H2 : N2 ratio at 3 :1
Description : Green house gases blanket/block the infrared radiation from earth's surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect? (A) CO2 (B) H2 (C) SO3 (D) N2
Last Answer : (C) SO3
Description : All gases during throttling process at atmospheric temperature and pressure show a cooling effect except (A) CO2 (B) H2 (C) O2 (D) N2
Last Answer : (B) H2
Description : Which of the following gases will effuse out of football bladder most quickly ? (1) He (2) H2 (3) N2 (4) O2
Description : Choose the option that includes the most appropriate solutions for the blanks. It was the postman himself who _______ the letter to him while the postmaster, experiencing the ________ of a man who has performed a good ... (b) gave, satisfaction , job (c) gave, plight, effort (d) took , right , job
Last Answer : (b) gave, satisfaction , job
Description : Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N2 & H2 is high. The presence of promoter along with the catalyst helps in ... B) Increasing the effectiveness (C) Improving the strength & heat resistance (D) All a, b & c
Last Answer : (D) All a, b & c
Description : Describe a simple experiment to study the thermal expansion of Gases.
Last Answer : I. Take an empty flask and fit a cork into the mouth of the flask. II. Limb of the U shaped glass tube through the cork. III. Clamp the flask in a stand as shown in fig. IV. Dip the ... and produce bubbles in water. X. On cooling flask contracts and water level is pulled up in the glass tube.
Description : Two nitrogen of the pyrimidines ring are obtained from (A) Glutamine and Carbamoyl-p (B) Asparate and Carbamoyl-p (C) Glutamate and NH3 (D) Glutamine and NH3
Last Answer : Answer : B
Description : Largest capacity nitrogenous fertiliser plants (2700 tons of NH3 per day) (2 Nos.) in India are located at (A) Thal-Vaishet (under RCF in Maharashtra) and Hazira (under IFFCO in Gujarat) (B) Talcher (Orissa) ... ) and Talcher (Orissa) both under FCI (D) Haldia (W.B) and Namrup (Assam) both under HFC
Last Answer : (A) Thal-Vaishet (under RCF in Maharashtra) and Hazira (under IFFCO in Gujarat)
Description : Life originated by chemosynthesis was proved in the laboratory by – (1) Sanger (2) Pasteur (3) Miller (4) Aristotle
Last Answer : (3) Miller Explanation: The Miller-Urey experiment of 1952 simulated the conditions thought at the time to be present on the early Earth, and tested the chemical origin of life under those ... creation of amino ac-ids was used in this experiment to explain life's origins by chemosynthesis.