In the manufacture of ortho-phosphoric acid by strong H2SO4 leaching wet process, keeping the reactor temperature above 100°C, results in the formation of undesirable (A) CaSO4 .½ H2O and CaSO4 crystals (B) Pyrophosphoric acid (C) Meta-phosphoric acid (D) All (A), (B) and (C)

In the manufacture of ortho-phosphoric acid by strong H2SO4
leaching
wet process, keeping the reactor temperature above 100°C, results in the
formation of undesirable
(A) CaSO4
.½ H2O and CaSO4 crystals
(B) Pyrophosphoric acid
(C) Meta-phosphoric acid
(D) All (A), (B) and (C)
by

1 Answer

Answer :

(A) CaSO4
.½ H2O and CaSO4 crystals
by

Related questions

Pick out the wrong statement. (A) Dehydration of ammonium carbamate to produce urea is endothermic (B) Direct use of liquid ammonia as a fertiliser for a tropical country like India is suitable (C) Gypsum (CaSO4 . 2H2O) is obtained as a by-product in the wet process for manufacture of ortho-phosphoric acid (D) Phosphate rock when reacted with dilute H2SO4 produces superphosphate

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Last Answer : (B) Direct use of liquid ammonia as a fertiliser for a tropical country like India is suitable

. Heating of ortho-phosphoric acid to about 900°C, produces (A) Meta-phosphoric acid (B) Pyrophosphoric acid (C) No change in it (D) None of these

Description : . Heating of ortho-phosphoric acid to about 900°C, produces (A) Meta-phosphoric acid (B) Pyrophosphoric acid (C) No change in it (D) None of these

Last Answer : (A) Meta-phosphoric acid

Heating of ortho-phosphoric acid to 250°C produces (A) Meta-phosphoric acid (B) Pyrophosphoric acid (C) No change in it (D) None of these

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Which of the following solvents is used for the extraction of H3PO4 from CaCl2 solution during manufacture of ortho-phosphoric acid by wet process employing hydrochloric acid leaching? (A) Isopropyl alcohol (B) Butyl alcohol (C) Toluene (D) Hexane

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In the manufacture of H3 PO4 (ortho); strong H2 SO4 leaching wet process as compared to electric furnace process (A) Uses lower grade phosphate rock (B) Requires lower capital investment in the plant(C) Produces lower purity acid(D) Is very costly

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Last Answer : (C) Produces lower purity acid

Chemical formula of meta-phosphoric acid is (A) H3PO4 (B) H4P2O7 (C) HPO3(D) Same as that of Pyrophosphoric acid

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Pick out the correct statement about catalytic polymerisation. (A) H2SO4 polymerisation process gives gasoline rich in unsaturates (B) In H2SO4 polymerisation, H3PO4 is always used with 2% steam to prevent meta & ortho H3PO4 formation, which are inactive (C) Both (A) and (B) (D) Neither (A) nor (B

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Reaction of ortho-phosphoric acid with phosphate rock produces (A) Superphosphate (B) Triple superphosphate (C) Meta-phosphoric acid (D) Monoammonium phosphate

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H3PO4 is the chemical formula of __________ phosphoric acid. (A) Pyro (B) Ortho (C) Meta (D) None of these

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HPO3 is the chemical formula of __________ phosphoric acid. (A) Pyro (B) Ortho (C) Meta (D) None of these

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Which of the following statements is false about toluene? (a) can be prepared by treating benzene with methyl chloride in the presence of AlCl3. (b) is converted to benzoic acid on refluxing with acidic KMnO4 solution. (c) on refluxing with concentrated H2SO4 gives a mixture of ortho and para toluenesulfonic acid. (d) can be nitrated with concentrated nitric acid to give a mixture of ortho and meta nitrotoluene.

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Electric process as compared to wet process (for the manufacture of phosphoric acid) (A) Can use only high grade phosphate rock (B) Is used less frequently (C) Produces a valuable by-product called gypsum (D) Is weak acid process

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Reaction of ortho-phosphoric acid with soda ash produces (A) Sodium Tributyl phosphate (STPP) (B) Tricresyl phosphate (C) Tributyl phosphate (D) Nitrophosphate

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ction of calcium Fluorapatite with sulphuric acid produces (A) Ortho-phosphoric acid (B) Simple superphosphate (C) Triple superphosphate (D) Red phosphorous

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Glauber's salt is chemically represented by (A) Na2SO4 .10H2O (B) CaCl(OCl) (C) CaSO4 .H2O (D) (NH4 )2SO4

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Which of the following will undergo substitution in the ortho and para positions rather than in the meta position? (a) Nitrobenzene (b) Benzoic acid (c) Acetanilide (d) Benzaldehyde

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. Which of the following reagents will react with furan to form 2-furansulfonic acid? (a) SO3 in pyridine at 100°C (b) Dilute H2SO4 at 200°C (c) SO2 at 100°C (d) Dilute H2SO4 at 100°C

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Brass container is suitable for storing (A) Aqueous ammonia (B) **** (C) H2SO4 (95%) (D) Phosphoric acid (95%)

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Montecatini process is used for the manufacture of (A) Nitric acid (B) Phosphoric acid (C) Urea (D) Calcium ammonium nitrate (CAN)

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Mannheim furnace is used in the manufacture of (A) Hydrochloric acid (B) H2SO4 by Chamber process (C) Calcium carbide (D) Corundum

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Although — NH2 gp is an ortho and para directing gp, nitration of aniline gives along with ortho and para, meta derivatives also.

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Phenol is an ortho-para director because the hydroxyl group : (a) donates electrons that increase electron density at ortho and para positions favoring nucleophilic attack. (b) donates electrons that increase electron density at ortho and para positions favoring electrophilic attack. (c) donates electrons to the ortho and para positions and attracts electrons away from meta positions favoring nucleophilic attack of the ring. (d) donates electrons to the ortho and para positions and attracts electrons away from meta positions favoring electrophilic attack on the ring.

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For reactions of ethylbenzene, the ethyl group is considered : (a) ortho director (b) ortho-para director (c) meta director (d) ortho-meta director

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Description : In the converter of the contact process for the manufacture of H2SO4 the equilibrium conversion of SO2__________ (i) __________ with increase in temperature and __________ (ii) __________ with increase in the mole ratio ... increases (C) (i) increases (ii) increases (D) (i) decreases (ii) decreases

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A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A → B. Assume the heat of reaction is - 1kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50J/mole.K. The temperature rise after a conversion of 0.5 will be: (A) 5°C (B) 10°C (C) 20°C (D) 100°C

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In an alkyl halide substitution of hydrogen by deuterium results in slow formation of ion pair. This is known as? a. Ortho effect b. Mesomeric effect c. Secondary kinetic isotope effect d. Primary kinetic isotope effect

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Pick out the wrong statement. (A) 'Green acid' is the other name of phosphoric acid produced by the reaction of phosphate rock & sulphuric acid (B) Chemically unreactive nature of red phosphorous is due to its polymeric structure (C) Red phosphorous is the most reactive allotropic form of phosphorous (D) Red phosphorous, which is used in the manufacture of safety matches, is converted into white phosphorous by vaporisation followed by condensation

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