Description : What purpose does FeCl3 serve in the electrophilic aromatic substitution reaction between chlorine and benzene? (a) It serves as a radical initiator to produce the chlorine radical needed to propagate the ... by reacting with the Cl2 and thereby activates it toward attack by benzene's π electrons.
Last Answer : It serves as a Lewis acid catalyst by reacting with the Cl2 and thereby activates it toward attack by benzene’s π electrons.
Description : Which is defined as a species that accepts a proton? (a) Lewis acid (b) Lewis base (c) Bronsted-Lowry acid (d) Bronsted-Lowry base
Last Answer : Bronsted-Lowry base
Description : A nucleophile acts as a __________ when it reacts with an electrophile. (a) Bronsted-Lowry acid (b) Arrhenius base (c) Lewis acid (d) Lewis base
Last Answer : Lewis base
Description : An electrophile acts as a __________ when it reacts with a nucleophile. (a) Bronsted-Lowry base (b) Arrhenius base (c) Lewis acid (d) Lewis base
Last Answer : Lewis acid
Description : A compound which is an electron pair donor is generally classified as a: w) Lewis acid x) Bronsted base y) Bronsted acid z) Lewis base
Last Answer : ANSWER: Z -- LEWIS BASE
Description : A substance that accepts an electron pair is classified as a: w) bronsted-lowry acid x) bronsted-lowry base y) lewis acid z) lewis base
Last Answer : ANSWER: Y -- LEWIS ACID
Description : Any species that acts as an electron-pair acceptor a: w) Lewis base x) Bronsted base y) Lewis acid z) Bronsted acid
Description : What are Lewis acids?
Last Answer : Ans .Lewis acids accept an electron pair. Lewis Acids are Electrophilic meaning that they are electron attracting. When bonding with a base the acid uses its lowest unoccupied molecular orbital or LUMO.An atom, ion ... with an incomplete octet of electrons can act as an Lewis acid (e.g., BF3, AlF3).
Description : Ethers are (a) Lewis acids (b) Neutral (c) Lewis bases (d) Can not be predicted
Last Answer : Lewis bases
Description : Ammonia can be considered a Lewis base because it can donate: w) electrons x) protons y) hydronium ions z) hydroxide ions
Last Answer : ANSWER: A -- ELECTRONS
Description : Which statement is correct about acid-base chemistry? (a) the larger the Ka, the stronger the acid (b) a small pKa correspond to a large Ka (c) the smaller the pKa, the stronger the acid (d) all of the above
Last Answer : all of the above
Description : In the coordination compound ,`Na_(2)[Pt(CN)_(4)]` the Lewis acids is
Last Answer : In the coordination compound ,`Na_(2)[Pt(CN)_(4)]` the Lewis acids is A. `[Pt(CN)_(4)]^(2-)` B. `Na^(+)` C. `Pt^(2+)` D. `CN^(-)`
Description : Which of the following compounds is not a Lewis acids?
Last Answer : Which of the following compounds is not a Lewis acids? A. `BF_(3)` B. `SnCl_(4)` C. `R-OR` D. `P-MgX`
Description : Why boron compounds behave as Lewis acids?
Last Answer : What is the answer ?
Description : Do you expect the carbon hydride of the type (CnH2n+2) to acts as Lewis acid or bases? Justify your answer
Last Answer : Ans: carbon hydride of the types(CnH2n+2)are electron-precise hydrides. In other words they have exact number of electron to form covalent bonds therefore they do not show any tendency to either gain or lose electron hence they are neither Lewis acid or Lewis bases.
Description : Amino acids are mostly synthesised from (a) mineral salts (b) fatty acids (c) volatile acids (d) α-ketoglutaric acid.
Last Answer : (d) α-ketoglutaric acid.
Description : Which of the following statements is false about aniline? (a) It is a primary aromatic amine. (b) It is a weak base which forms salts with acids. (c) It liberates nitrogen on treatment with ice-cold nitrous acid. (d) It can be prepared by the reduction of nitrobenzene with tin and HCl
Last Answer : It liberates nitrogen on treatment with ice-cold nitrous acid
Description : Buffer solutions have constant acidity and alkalinity because: (1) they have fixed value of pH (2) these give unionised acid or base on reaction with added acid or alkali (3) acids and alkalies in these solutions are shielded from attack by other ions (4) they have large excess of H+ or OH– ions
Last Answer : these give unionised acid or base on reaction with added acid or alkali
Description : Which of the following chemical reactions does not lead to formation of a salt? w) Reaction of salts with acids. x) The reaction of base anhydrides with acid anhydrides. y) Action of water on oxides of nonmetals. z) Reaction of acid with base.
Last Answer : ANSWER: Y -- ACTION OF WATER ON OXIDES OF NONMETALS. (If water reacts with oxides of nonmetals, an acid is formed.)
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 is strongest Lewis Base
Last Answer : Which of the following is strongest Lewis Base A. `H_(2)O` B. `CH_(3)OH` C. `CH_(3)OCH_(3)` D. `C_(6)H_(5)OH`
Description : What is 'acid and alkali' according to scientist Lewis ?
Last Answer : Lewis, the scientist who advocated the electronic doctrine of acid and alkali. According to his theory, the compound that receives electrons is called acid. And the compound that rejects electrons is called alkali.
Description : The chlorides of both beryllium and aluminium are Lewis acid Why ?
Last Answer : Ans Incomplete octate.
Description : Which of the following is a Lewis acid? (a) AlCl3 (b) CH3OH (c) NH3 (d) CH3OCH3
Last Answer : AlCl3
Description : Cell physiology includes application of most of law’s of which subjects. a. Biology b. Chemistry c. Physics and Chemistry d. Physics
Last Answer : Physics and Chemistry
Description : For women aged 19-39 years, recommended health screening diagnostic testing includes which of the following? a) Pap smear A Pap smear is recommended for women aged 19-39 years, as well as ... Bone mineral density testing Bone mineral density testing is recommended for women aged 40 years and older.
Last Answer : a) Pap smear A Pap smear is recommended for women aged 19-39 years, as well as for women aged 40 and older.
Description : Degeneracy of the genetic code denotes the existence of (A) Base triplets that do not code for any amino acids (B) Codons consisting of only two bases (C) Codons that include one or more of the unusual bases (D) Multiple codons for a single amino acid
Last Answer : Answer : B
Description : Viroids and prions differ in that viroids are believed to contain only ______, while prions are believed to contain only _______. a. carbohydrate; amino acids b. nucleic acid; protein c. amino acids; carbohydrate d. protein; nucleic acid
Last Answer : b. nucleic acid; protein
Description : Most liquids that conduct electricity are solutions of acids, bases and ______. Salts Who is known as the father of modern chemistry?
Last Answer : Antoine Lavoisier
Description : I want to differentiate between organic acids and mineral acids. ?
Last Answer : Organic compounds that act as acids are called organic acids. And the acids that are found in minerals are called mineral acids. Organic acids are weak acids. Mineral acids are strong acids . ... acid has high melting point and boiling point. Organic acid reacts late. Mineral acid reacts quickly.
Description : (A) Ether behaves as bases in the presence of mineral acids. (R ) Due to the presence of lone pair of electrons on oxygen.
Last Answer : (A) Ether behaves as bases in the presence of mineral acids. (R ) Due to the presence of lone pair of ... R is false D. A is false but R is true
Description : Sulphur is made available to the body by the amino acids: (A) Cystine and methionine (B) Taurine and alanine (C) Proline and hydroxyproline (D) Arginine and lysine MINERAL METABOLISM 191
Last Answer : Answer : A
Description : Acidity in water is caused due to (A) Mineral acids (B) Free CO2 (C) Iron sulphate (D) All the above
Last Answer : (D) All the above
Description : What did Lewis and Clark's and Zebulon Pike's expeditions have in common?
Last Answer : The Pike Expedition (July 15, 1806 - July 1, 1807) was a military party sent out by President Thomas Jefferson and authorized by the United States government to explore the south and west of the recent Louisiana Purchase. ... The expedition documented the United States' discovery of Pikes Peak.
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 : 10.(a) An ore on treatment with dilute hydrochloric acid produces brisk effervesces. What type of ore is this? What steps will be required to obtain metal from the enriched ore. , (b) ... in coin and colour of the solution ? Write balanced chemical equation of the reaction involved. -Chemistry
Last Answer : (a) Carbonate ore: (i) Calcination: Carbonate ore is heated in limited supply of air and oxide is obtained, e.g. (b) Copper, being more reactive than silver will displace silver from silver nitrate ... and there will be deposition of silver on copper coin. The colour of solution will turn to blue.
Description : _______ is the process in which acids and bases react to form salts and water. (1) Neutralization (2) Electrolysis (3) Distillation (4) Hydrolysis
Last Answer : (1) Neutralization Explanation: Neutralization is a process when acids and bases react to form salt and water.
Description : Biofertilizers convert nitrogen to _______ . (1) nitrates (2) ammonia (3) nitrogenase (4) amino acids
Last Answer : ammonia
Description : What is the active ingredient in many common laxative that is also an acid-base indicator?
Last Answer : ANSWER: PHENOLPHTHALEIN (pron: fEn-el-thal-E-en)
Description : Consider the coordination compound , `[Co(NH_(3))_(6)]Cl_(3)`. In the formation of the complex, the species which acts as the Lewis acid is :
Last Answer : Consider the coordination compound , `[Co(NH_(3))_(6)]Cl_(3)`. In the formation of the complex, the species which ... -)` C. `Co^(3+)` D. `NH_(3)`
Description : Identify a species which is not a Bronsted acid but a Lewis acid:
Last Answer : Identify a species which is not a Bronsted acid but a Lewis acid: A. HCl B. `NH_(3)` C. `BF_(3)` D. `H_(3)^(+)O`
Description : Which of the following is Lewis acid ?
Last Answer : Which of the following is Lewis acid ? a. BaCl2 b. KCl c. BeCl2 d. LiCl
Description : Metallic oxide like MgO reacts with water to form a _______. a)base b)acid c)salt d)water
Last Answer : a)base
Description : The nurse's base knowledge of primary immunodeficiencies includes which of the following statements? Primary immunodeficiencies a) develop early in life after protection from maternal antibodies decreases ... . Without treatment, infants and children with these disorders seldom survive to adulthood.
Last Answer : a) develop early in life after protection from maternal antibodies decreases. These disorders may involve one or more components of the immune system.
Description : Bill is furious when he reads the invoice since it includes £50 in shipping charges and he had assumed that the price quoted by the seller had included these charges. Bob should have checked that ... were: A)FOB factory price B)base point price C)freight absorption price. D)FOB destination price.
Last Answer : D)FOB destination price.
Description : Choose the option that includes the most appropriate solution to the blanks in the given line. The poem _______ how animals in _______ suffer from an _______ life. (a) shows, freedom, unusual (b) verifies, captivity, odd (c) makes, freedom, unusual (d) shows, captivity, unnatural
Last Answer : (d) shows, captivity, unnatural
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 : The ending of the chapter has been paraphrased. Choose the option that includes the most appropriate solution to the blanks in the given paraphrase. The ending of the story _______ Lencho sound like ... , conviction (c) Made, untruthful, truly, acquittal (d) Making, unthankful, completely, acquittal
Last Answer : (b) Makes, ungrateful, Furthermore, conviction
Description : A best-effort delivery service suchas IPv4 includes _______. A) error checking B) error correction C) datagram acknowledgment D) noneof the above
Last Answer : noneof the above