Description : Write balanced equation for the reaction between magnesium and hydrochloric acid. Name the product obtained, identify the type of reaction. -Chemistry
Last Answer : Answer. The product formed is magnesium chloride and hydrogen gas. It is a displacement reaction.
Description : As I traveled up and down our great glorious country, I found myself in a place where the tempature goes up sharply in the day and down at night. This had an effect on my watch, I noticed it was 1/ ... One morning- May 1- my watch showed the right time. By what date was it 5 minutes faster? -Riddles
Last Answer : In 24 hours the watch gained 1/2-1/3= 1/6 minute. It would seem it would be 5 minutes fast in 5 X 6= 30 days; that is,the morning of May 31. But already on the morning of May 28 the was 27/6 ... fast. At the close of the day the watch gained 1/2 minute more, so it was 5 minutes fast on may 28.
Description : Which one of the following is a false statement about atopic eczema? a) It commonly begins by drug reaction. b) Super-added herpes simplex infection is a serious complication. c) The serum IgE ... . d) The skin lesions are typically itchy. e) Treatment with systemic steroids is often necessary.
Last Answer : Ans: E
Description : Calcination reaction of limestone (CaCO3 → CaO + CO2 ) goes to completion in the rotary kiln, because (A) CaO is not dissociated (B) CO2 escapes continuously (C) Of high calcination temperature (D) CaO is more stable than CaCO3
Last Answer : (B) CO2 escapes continuously
Description : Select the most appropriate hypolipidemic drug for a patient with raised LDL-cholesterol level but normal triglyceride level: A. A HMG-CoA reductase inhibitor B. A fibric acid derivative C. Gugulipid D. Nicotinic acid
Last Answer : A. A HMG-CoA reductase inhibitor
Description : 1. A convex lens of glass has power P in air. If it is immersed in water, what will be its power? 2. The internal secretion of which acid helps in digestion? 3. Who is responsible for ... 19. 17th Parallel separates which country? 20. Who established Fergusson College at Pune in the year 1885 ?
Last Answer : Answer : 1. Less than P 2. Hydrochloric acid 3. Election Commission 4. Asia 5. Gopala 6. Direct tax 7. Shooting 8. Acetylene 9. Titusfills in Pennsylvania, U.S.A. 10. Makrana marble 11 ... Demand draft 17. Infra-red-waves 18. Permanent tissue 19. North and South Vietnam 20. Deccan Education Society
Description : I've been asked to find the temperature to which a 20.0°C gas must be raised to increase its root mean square (rms) speed by a given percentage. Is this possible without knowing the identity of the gas?
Last Answer : Pretend the gas is hydrogen. Work out the problem. Pretend the gas is oxygen. Work out the problem. Are the answers you get any different?
Description : What happens to the volume of gas when its temperature is raised and its pressure is kept constant?
Last Answer : Need answer
Description : A gas has a temperature of 14 degrees C, and a volume of 4.5 L. If the temperature is raised to 29 degrees C and the pressure is not changed, what is the new volume of the gas?
Last Answer : V1/T1 = V2/T2 (Charles' Law) T is in Kelvin. Celsius temp plus 273.15 = K T1 = 14 +273 = 287 K T2 = 29 + 273 = 303 K 4.5 / 287 = V2 / 303 V2 = 4.75 L = 4.8 L
Description : Predict the entropy change in- (i) A liquid crystallizes into solid (ii) Temperature of a crystalline solid raised from 0K to 115K.
Last Answer : Ans. (i) Entropy decreases because molecules attain an ordered state. (ii) Entropy increases because from 0K to 115K average kinetic of moleculesincreases.
Description : The boiling temperature of the water in the radiator is raised to abouta) 100°C b) 105°C c) 110° C d) 115° C
Last Answer : c) 110° C
Description : A composite beam is composed of two equal strips one of brass and other of steel. If the temperature is raised (A) Steel experiences tensile force (B) Brass experiences compressive force (C) Composite beam gets subjected to a couple (D) All the above
Last Answer : (D) All the above
Description : Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to __________ °C. (A) 270 (B) 327 (C) 300 (D) 540
Last Answer : (B) 327
Description : A sample of gas has a volume of 210 cubic centimeters at a temperature of 250 degrees Kelvin. The temperature is raised to 500 degrees Kelvin while the pressure remains unchanged. What is the new volume of the gas.
Last Answer : ANSWER: 420 CUBIC CENTIMETERS
Description : How many joules are required to cause the temperature of one gram of water to be raised from 24 degrees Celsius to 25 degrees Celsius.
Last Answer : ANSWER: 4.18 JOULES
Description : How can you justify that a reaction between magnesium and oxygen is a redox reaction w hile the reaction shows only addition of oxygen 2mg plus O 2mgo?
Last Answer : Oxidation is a redox reaction.
Description : Why magnesium oxidized occurs during the reaction of magnesium chloride?
Last Answer : What is the answer ?
Description : The pair(s) which will show displacement reaction is/are (i) NaCl solution and copper metal (ii) AgNO3 solution and copper metal (iii) Al2(SO4)3 solution and magnesium metal (iv) ZnSO4 solution and iron metal (a) (ii) only (b) (ii) and (iii) (c) (iii) and (iv) (d) (i) and (ii)
Last Answer : (c) (iii) and (iv)
Description : The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is: (a) Copper granules (b) Magnesium ribbon (c) Sodium pellets (d) Aluminum dust
Last Answer : (d) Aluminum dust
Description : The oxygen evolved during photosynthesis, comes from water molecules. Which one of the following pairs of elements is involved in this reaction? (a) Magnesium and Molybdenum (b) Magnesium and Chlorine (c) Manganese and Chlorine (d) Manganese and Potassium
Last Answer : (c) Manganese and Chlorine
Description : Molten sodium is used as a coolant in a fast breeder reactor, because of its (A) Excellent moderating properties (B) Neutron breeding capability (C) Faster heat removal capability from the core (D) Capability to increase the reaction rate in the core
Last Answer : (C) Faster heat removal capability from the core
Description : Free energy changes for two reaction mechanism 'X' and 'Y are respectively - 15 and - 5 units. It implies that ‘X’ is (A) Slower than Y (B) Faster than Y (C) Three times slower than Y (D) Three times faster than Y
Last Answer : (B) Faster than Y
Description : Compared to subcutaneous injection, the intramuscular injection of drugs: A. Is more painful B. Produces faster response C. Is unsuitable for depot preparations D. Carries greater risk of anaphylactic reaction
Last Answer : B. Produces faster response
Description : The following ions help in enzymatic transfer of phosphate from ATP to pyruvic acid: (A) Sodium (B) Calcium (C) Magnesium (D) Potassium
Last Answer : Answer : D
Description : The chemical used for destroying Fungi in water tanks is - (1) Copper sulphate (2) Magnesium sulphate (3) Zinc sulphate (4) Nitric acid
Last Answer : (1) Copper sulphate Explanation: Copper sulfate is a chemical compound which is produced commercially by reacting various copper (II) compounds with sulfuric acid. This compound is used in a wide range ... sprayed on grapes in the form of a water solution to reduce the risk of fungal infestations.
Description : Give reason: a) Magnesium reacts more vigorously with hydrochloric acid than zinc or copper. b) Iron takes more time to react with dilute hydrochloric acid than magnesium and zinc
Last Answer : a) Magnesium reacts more vigorously with hydrochloric acid than zinc or copper. The reactivity of magnesium is higher than that of zinc. Hence it reacts with hydrochloric acid more vigorously. b) ... acid than magnesium and zinc As iron has lowest reactivity when compare to magnesium and zinc.
Description : Write balanced chemical equations for the following word equations: (a) Iron + Chlorine → Iron (III) chloride (b) Magnesium + dil sulphuric acid → Magnesium sulphate + water (c) Magnesium + oxygen → ... oxide (d) Calcium oxide + water → Calcium hydroxide (e) Sodium + chlorine → Sodium chloride
Last Answer : (a) Iron + Chlorine → Iron (III) chloride 4Fe + 3Cl2 → 2F2Cl3 (b) Magnesium + dil sulphuric acid → Magnesium sulphate + water 2Mg + 2H2SO4 → 2MgSO4 + 2H2 (c) Magnesium + oxygen → Magnesium oxide 2Mg ... hydroxide CaO + H2O → Ca(OH)2 (e) Sodium + chlorine → Sodium chloride 2Na + Cl2 → 2NaCl
Description : Write the molecular formulae of: 1. Copper oxide 2. Iron (III) chloride 3. Sodium hydroxide 4. Iron (II) sulphide 5. Lead (II) oxide 6. Hydrogen nitrate (nitric ... Hydrogen sulphate (sulphuric acid) 8. Calcium hydroxide 9. Magnesium carbonate 10.Ammonium carbonate
Last Answer : 1. Copper oxide - CuO 2. Iron (III) chloride - FeCl3 3. Sodium hydroxide - NaOH 4. Iron (II) sulphide - FeS 5. Lead (II) oxide - PbO 6. Hydrogen nitrate (nitric acid) - HNO3 7. ... ) - H2SO4 8. Calcium hydroxide - Ca(OH)2 9. Magnesium carbonate - MgCO3 10.Ammonium carbonate - (NH4)2CO3
Description : Magnesium is a constituent of : (A) Nucleic Acid (B) Enzyme system (C) Cell wall (D) Chlorophyll
Last Answer : (D) Chlorophyll
Description : Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum ... yellow leaves and spraying the remaining green leaves with 2, 4, 5-trichlorophenoxy acetic acid
Last Answer : (a) Application of iron and magnesium to promote synthesis of chlorophyll
Description : Grignard reagent is chemically known as (A) Ethyl magnesium chloride (B) Methyl magnesium chloride (C) Dichlorophenol (D) Monochloroacetic acid
Last Answer : (A) Ethyl magnesium chloride
Description : Cooking liquor in case of sulphite process is (A) Sodium sulphite and sodium bisulphite (B) Magnesium sulphite and free SO2 in acid medium (C) Magnesium sulphate and magnesium bicarbonate (D) None of these
Last Answer : (A) Sodium sulphite and sodium bisulphite
Description : Antacid combinations of magnesium and aluminium salts are superior to single component preparations because: A. They have rapid as well as sustained acid neutralizing action B. They are less likely to affect gastric emptying C. They are less likely to alter bowel movement D. All of the above
Last Answer : D. All of the above
Description : Choose the correct statement about magaldrate: A. It is a mixture of magnesium and aluminium hydroxides B. It has a rapid as well as sustained acid neutralizing action C. Its acid neutralizing capacity is 2 m Eq/g D. It causes systemic alkalosis
Last Answer : B. It has a rapid as well as sustained acid neutralizing action
Description : Thiazide diuretics and furosemide have directionally opposite effect on the net renal excretion of the following substance: A. Uric acid B. Calcium C. Magnesium D. Bicarbonate
Last Answer : B. Calcium
Description : Which one of the following metals is immune to corrosion by air, water, hydrochloric acid and nitric acid; but is soluble in aqua regia? w) gold x) silver y) magnesium z) nickel
Last Answer : ANSWER: W -- GOLD
Description : Which of the following aqueous solutions would hav the lowest boiling point? Would it be a 1.0 molal solution of: w) Hydrochloric acid x) Sodium Hydroxide y) Acetic Acid, z) Magnesium Chloride
Last Answer : ANSWER: Y -- ACETIC ACID
Description : Which of the following elements would form an acid oxide with the formula XO2 and an acidic compound with hydrogen with the formula XH2? w) Sodium x) Magnesium y) Aluminum z) Sulfur
Last Answer : ANSWER: Z -- SULFUR
Description : The chemical used for destroying Fungi in water tanks is (1) Copper sulphate (2) Magnesium sulphate (3) Zinc sulphate (4) Nitric acid
Last Answer : Copper sulphate
Description : The following element can't impart high strength at elevated temperature A. Manganese B. Magnesium C. Nickel D. Silicon
Last Answer : B. Magnesium
Description : The metals with very low melting points which melts by the temperature of palm are A) Sodium and potassium B) Lead and magnesium C) Aluminium and zinc D) Gallium and caesium
Last Answer : D) Gallium and caesium
Description : Which of the following metals is a solid at room temperature, yet melts in your hand? w) gallium x) cesium y) sodium z) magnesium
Last Answer : ANSWER: W -- GALLIUM
Description : Why does higher molar acid react faster?
Last Answer : answer:sigh We don’t do your homework for you here. (but essentially, high molar acids are more concentrated)
Description : Acetyl chloride undergoes nucleophilic substitution at a faster rate than methyl acetate because __________. (a) the ester is more sterically hindered than the acid chloride (b) the acid chloride is ... is a better leaving group than chloride (d) chloride is a better leaving group than methoxide
Last Answer : chloride is a better leaving group than methoxide
Description : What is true of acid control therapy with H2 blockers: A. It generally heals duodenal ulcers faster than gastric ulcers B. It checks bleeding in case of bleeding peptic ulcer C. It prevents gastroesophageal reflux D. Both ‘A’ and ‘B’ are correct
Last Answer : A. It generally heals duodenal ulcers faster than gastric ulcers
Description : Weakly acidic drugs: A. Are bound primarily to α1 acid glycoprotein in plasma B. Are excreted faster in alkaline urine C. Are highly ionized in the gastric juice D. Do not cross blood-brain barrier
Last Answer : B. Are excreted faster in alkaline urine
Description : If I want the outside of a cake to cook faster because I am using a smaller pan, should I raise the cooking temperature or maybe put the pan on a lower rack?
Last Answer : I would think lower the temperature a little and go a little longer with the cooking. I would have to figure that out by trial and error though. Slower cooking so it goes all the way through seem logical.