Description : Which of the following process-es does not increase the amount of carbon dioxide in air? (1) Breathing (2) Photosynthesis (3) Burning of petrol (4) Aerobic decay of vegetation
Last Answer : (2) Photosynthesis Explanation: Plants reduce the CO2, because they use it with photosynthesis. They use it to give oxygen and carbohydrates as the final product. It is for this reason that ... from exposure to the sun's ultraviolet (UV) radiation, especially during the early morning hours.
Description : Why is Burning sugar an exothermic reaction?
Last Answer : What is the answer ?
Description : Which among the following changes are endothermic in nature (a) decomposition of ferrous sulphate (b) dissolution of ammonium chloride in water (c) both (a) and (b) (d) dilution of hydrochloric acid
Last Answer : (c) both (a) and (b)
Description : Pick out the wrong statement (A) Co-current absorbers are usually used, when the gas to be dissolved in the liquid is a pure substance (B) In case of gas absorption, HETP is ... reaction (D) In actual practice, absorption is an endothermic process, while stripping is an exothermic process
Last Answer : (D) In actual practice, absorption is an endothermic process, while stripping is an exothermic process
Description : (a) Define a balanced chemical equation. Why should an equation be balanced? (b) Write the balanced chemical equation for the following reaction: (i) Phosphorus burns in presence of chlorine to form phosphorus penta chloride. (ii) Burning of natural gas. (iii) The process of respiration. -Chemistry
Last Answer : Answer. (a) Balanced chemical equation has an equal number of atoms of different elements in the reactants and products. According to law of conservation of mass, matter can neither be created nor be destroyed in a chemical ... C6H12O6 (s) + 6O2 (g) + 6H2O ---> 6CO2 (aq) + 12H2O (l) + energy
Description : The enthalpy change when ammonia gas is dissolved in water is called the heat of (A) Solution (B) Formation (C) Dilution (D) Combustion
Last Answer : (A) Solution
Description : Solvent deoiling process is used for separating oil and soft wax from hard wax. Methyl iso-butyl ketone and methyl ethyl ketone (MEK) are two commonly used deoiling solvents. Use of former as the deoiling solvent ... nitration temperature (C) Lower solvent dilution ratio (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : The process of dissolving an acid or a base in water is a highly - (1) Exothermic reaction (2) Endothermic reaction (3) Sublimation reaction (4) Redux reaction
Last Answer : (1) Exothermic reaction Explanation: The process of dissolving an acid or a base in water is a highly exothermic one. This is why care must be taken while mixing concentrated nitric acid or sulphuric acid with water.
Description : Steam reforming of naphtha produces ammonia synthesis gas. This is a/an __________ process. (A) Autocatalytic (B) Endothermic (C) Exothermic (D) Non-catalytic
Last Answer : (B) Endothermic
Description : Consider the following gases: 1. Neon 2. Chlorine 3. Carbon dioxide 4. Bromine The gas(es) which is/are not present in normal samples of air is/are: (a) 1 (b) 2 and 4 (c) 3 (d) 4
Last Answer : Ans:(b)
Description : Which of the following inert gas(es) form(s) clathrate compoud(s) with quinol?
Last Answer : Which of the following inert gas(es) form(s) clathrate compoud(s) with quinol? A. (A) Helium B. (B) Xenon C. (C) Krypton D. Neon
Description : Consider the following processes: 1. Evaporation 2. Fractional distillation 3. Distillation 4. Filtration The process(es) involved in the refining of crude oil is/ are: (a) 3 only (b) 2 and 3 (c) 3 only (d) 1 only
Description : Which of the following process(es) can given sulphur ?
Last Answer : Which of the following process(es) can given sulphur ? A. `H_(2)S` gas is passed through ... ` gas is passed through acidified `KMnO_(4)` solution
Description : What energy is converted into chemical energy by burning coal and natural gas in a power station ?
Last Answer : Chemical energy is converted into heat energy by burning coal and natural gas in the power station.
Description : What is the amount of natural gas in burning?
Last Answer : Heat is produced when C and H combine with oxygen (O) during combustion.Natural gas is primarily methane (CH4), which has a higher energy content relative to other fuels, and thus, it has a relatively lower CO2-to-energy content.
Description : How do I figure out the dilution factor for this equation?
Last Answer : answer:OKAY. So I figured out how to get the dilution factor (total volume divided by the aliquoted volume) and that's all fine and dandy. However, now I still don't get an appropriate answer. Let's ... not 1.98 mg/mL (my calculated result from the regression line) or anywhere close to 2.0 mg/mL
Description : Did I do this serial dilution wrong?
Last Answer : answer:Yeah, this is wrong. So, first of all, if you're doing dilutions always remember this equation: M1 x V1= M2 x V2 Where M1 is the initial concentration, V1 is the volume of that solution you ... than you expected. Seriously, M1 x V1 = M2 x V2. One of the best equations ever for chemistry.
Description : Can someone help me with this serial dilution?
Last Answer : answer:Use conversion factors and let the units do the work for you. 500 ug/mL * 1000 ng/ug * .001 mL/uL Note that ug and mL cancel and you're left with ng/uL. The 1000 and .001 also ... .67 times the amount of liquid already present in order to dilute it down to the right molarity. Does that help?
Description : Dilution factor problem?
Last Answer : Just make a proportion. Four tenths is what fraction of a milliliter? Four tenths equals how many microliters over one thousand microliters? (Ignore the dots please) 4 ....... x μL - =....- 10 .1000μL ... that x is on one side of the equation and you'll get the amount of the protein in the dilution.
Description : Pollutants that can be made harmless by quick dilution or conversion are called
Last Answer : biodegradable pollutants.
Description : Is hallucination or dilution associated with neurosis ?
Last Answer : Neurosis is a mental illness that is somewhat associated with hallucinations and delusions, but illusion delusions and hallucinations are not the same thing at all. One is false perception , ... . Basically neurosis , illusion , delusion and hallucination are human problems or human diseases.
Description : What is the effect of dilution on conductivity?
Last Answer : The conductance of a given conductor, C = La/l ..(i)\ L = l/Ra ..(ii)The resistance is expressed in units of ohm, the conductance has units of ohm-1 or mho.The conductance ... it is necessary to take the concentration of the solutions into consideration. It is done by using equivalentconductance, l.
Description : Action of norepinephrine and epinephrine are terminated by (a) Reuptake into nerve terminal (b) Dilution by diffusion and uptake at extraneuronal site (c) Metabolic transformation (d) All of the above
Last Answer : Ans: D
Description : The degree of dissociation of an electrolyte depends on - (1) dilution (2) impurities (3) atmospheric pressure (4) method of dissolution
Last Answer : (1) dilution Explanation: The extent to which an electrolyte dissociates into ions is known as degree of dissociation or ionization and depends upon the following factors: (1) Nature of the electrolyte, (2) Temperature, (3) Dilution, (4) nature of the solvent, and (e) presence of other ions.
Description : Disposal to sewage in large cities, is done in A. Irrigation B. Dilution C. Oxidation D. Purification
Last Answer : ANS: B
Description : A nuisance is experienced in diluting water if dilution factor is less than A. 100 B. 60 C. 40 D. 20
Last Answer : ANS: D
Description : Dilution method of disposing of sewage, is not preferred to A. When sewage is fresh B. When diluting water has high dissolved oxygen content C. When diluting water is used for water supply near the point of sewage disposed D. When the diluting water is having flow currents
Last Answer : ANS: C
Description : 54 Pick up the correct statement from the following: A. The ratio of the quantity of the diluting water to that of the sewage, is known as dilution factor B. The automatic purification of polluted ... phenomenon C. The photosynthesis is carried out in the presence of sun light D. All the above
Description : No treatment of the sewage is given if dilution factor is A. Less than 150 B. Between 150 to 200 C. Between 200 to 300 D. More than 500
Description : what is HDOP A : Horizantal geometric dilution of position B : Horizantal geometric dilution of precision C : Vertical geometric dilution of precision D : Vertical geometric dilution of position
Last Answer : B : Horizantal geometric dilution of precision
Description : what is GDOP A : Geometric dilution of position B : Geometric dilution of precisionC : Geometric dilution of path D : Geometric dilution of pointer
Last Answer : B : Geometric dilution of precision
Description : Which of the following is not a practical method of low level radioactive waste disposal? (A) Dilution with inert material (B) Discharging to atmosphere through tall stacks after dilution (C) Disposing off in rivers & oceans (D) Filling in steel crates and shooting it off out of earth's gravity
Last Answer : (D) Filling in steel crates and shooting it off out of earth's gravity
Description : A paper disc or small cylinder containing antibiotic is used in the antibiotic sensitivity assay known as the a. Tube dilution method. b. Immunodiffusion method. c. Agar diffusion method. d. Passive detection method.
Last Answer : c. Agar diffusion method.
Description : The is used to determine an antibiotic‘s minimal inhibitory concentration (NEC). a. Ames test b. tube dilution method c. agar disk diffusion method d. Kirby-Bauer test
Last Answer : b. tube dilution method
Description : .If a 1:600 dilution of a test compound kills a standard population of Staphylococcus aureus in 10minutes but not 5 minutes while a 1:60 dilution of phenol kills the population in thesame time, what is the phenol coefficient of the test compound? A- 1 B- 5 C- .10 D- .50
Last Answer : .10
Description : Which of the following methods is most likely to be quantitative? A-Dilution and plating B- Gram staining C- Wet mount D-None of these
Last Answer : Dilution and plating
Description : The dilution ratio at which the odour is hardly detectable is generally called threshold odour number and for public supplies it should not exceed (A) 3 (B) 5 (C) 7 (D) 9
Last Answer : (A) 3
Description : Those solutions in which there is no volume change upon mixing the components in the liquid state and which, when diluted do not undergo any heat change (i.e. heat of dilution is zero), are called __________ solutions. (A) Ideal (B) Real (C) Isotonic (D) None of these
Last Answer : (A) Ideal
Description : Pick out the wrong statement. (A) An ideal liquid or solid solution is defined as one in which each component obeys Raoult's law (B) If Raoult's law is applied to one component of a binary mixture; ... also (C) Henry's law is rigorously correct in the limit of infinite dilution (D) None of these
Last Answer : (D) None of these
Description : The activity co-efficient of the solute in a dilute solution (A) Decreases with the increase of concentration of the solute (B) Increases with the increase of concentration of the solute (C) Remains constant (D) Is unity at infinite dilution
Last Answer : (C) Remains constant
Description : The degree of dissociation of an electrolyte depends on (1) dilution (2) impurities (3) atmospheric pressure (4) method of dissolution
Last Answer : dilution
Description : Is acid rain an exothermic or endothermic reaction?
Last Answer : No
Description : The reaction between an acid and a base to give a salt and water is known as a - (1) Neutralisation reaction (2) Reduction reaction (3) Oxidation reaction (4) Exothermic reaction
Last Answer : (1) Neutralisation reaction Explanation: The effect of a base is nullified by an acid and vice-versa. Example: Reaction of Sodium hydroxide with hydrochloric acidNaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)
Description : Liquid ammonia and 60% nitric acid reaction (which producesammonium nitrate) is (A) Exothermic (B) Endothermic (C) Autocatalytic (D) None of these
Last Answer : (A) Exothermic
Description : Neutralisation of nitric acid with ammonia to produce ammonium nitrate is a/an __________ reaction. (A) Catalytic (B) Endothermic (C) Exothermic (D) Autocatalytic
Last Answer : (C) Exothermic
Description : Exothermic neutralisation reaction between caustic soda and dodecylbenzene sulfonic acid produces sodium dodecylbenzene sulphate, which is a/an (A) Explosive (B) Soap (C) Detergent (D) Analgesic drug
Last Answer : (C) Detergent