The chlorides of both beryllium and aluminium are Lewis acid Why ?

The chlorides of both beryllium and aluminium are Lewis acid Why ?
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Ans Incomplete octate.
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Mention the Diagonal Relationship between Beryllium and Aluminium

Description : Mention the Diagonal Relationship between Beryllium and Aluminium

Last Answer : The ionic radius of Be2+ is estimated to be 31 pm; the charge/radius ratio is nearly the same as that of the Al3+ ion. Hence beryllium resembles aluminium in some ways. Some of the similarities are: ... . (iv) Beryllium and aluminium ions have strong tendency to form complexes, BeF4 2-, AlF6 3- .

Aluminium, Beryllium is not readily attacked by acids, Why ?

Description : Aluminium, Beryllium is not readily attacked by acids, Why ?

Last Answer : Ans :Because of the presence of an oxide film.

Mention the Diagonal Relationship between Beryllium and Aluminium

Description : Mention the Diagonal Relationship between Beryllium and Aluminium 

Last Answer : The ionic radius of Be2+ is estimated to be 31 pm; the charge/radius ratio is nearly the same as that of the Al3+ ion. Hence beryllium resembles aluminium in some ways. Some of the similarities are: ... (iv) Beryllium and aluminium ions have strong tendency to form complexes, BeF4 2-, AlF6 3- . 

Which metal is extracted from sea water? (1) Potassium (2) Magnesium (3) Aluminium (4) Beryllium

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Esters can be formed by nucleophilic substitution reactions of : (a) carboxylic acids and alcohols ; acid-catalyzed (b) acid chlorides and alcohols (c) both of the above (d) neither of the above

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Description : Which of the following statements is false about secondary amines? (a) They react with chloroform and NaOH to form isocyanides. (b) They can be prepared by reduction of isocyanides. (c) They react ... give substituted amides. (d) They react with ice-cold nitrous acid to give nitrosamine (yellow oil)

Last Answer : They react with chloroform and NaOH to form isocyanides.

Which of the following acid-derivatives are most stable? (a) Acid chlorides (b) Esters (c) Amides (d) Anhydrides

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Last Answer : Amides

Acid chlorides undergo reduction to the corresponding aldehydes on treatment with hydrogen in the presence of Pd/BaSO4. This reaction is called : (a) Clemmensen reduction (b) Rosenmund reduction (c) Wolf-Kishner reduction (d) None of these

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Esters and amides are most easily made by nucleophilic acyl substitution reactions on : (a) acid anhydrides (b) carboxylates (c) carboxylic acids (d) acid chlorides

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Which one of the following tests employs Ethylene Diamine Tetra Acetic Acid as a titrating agent? (a) Chlorides (b) Dissolved oxygen (c) Hardness (d) Residual chlorine

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Description : According to IS:456-2000, the total acid soluble chlorides in concrete is restricted to________ of concrete [ A ] 0.2 kg/m3 [ B ] 0.4 kg/m3 [ C ] 2 kg/m3 [ D ] 4 kg/m3

Last Answer : [ B ] 0.4 kg/m3

According to IS:456-2000, the total acid soluble chlorides in concrete is restricted to________ of concrete [ A ] 0.2 kg/m3 [ B ] 0.4 kg/m3 [ C ] 2 kg/m3 [ D ] 4 kg/m3

Description : According to IS:456-2000, the total acid soluble chlorides in concrete is restricted to________ of concrete [ A ] 0.2 kg/m3 [ B ] 0.4 kg/m3 [ C ] 2 kg/m3 [ D ] 4 kg/m3

Last Answer : [ B ] 0.4 kg/m3

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Why are transition metal fluorides are ionic in nature where as chlorides and bromides are covalent in nature .

Description : Why are transition metal fluorides are ionic in nature where as chlorides and bromides are covalent in nature . 

Last Answer : Ans - It is because of fluorine is most electronegative where as Cl and Br are less electro negative . Greater the difference in electro negativity more will be ionic character .

Which of the following does not react with acyl chlorides to form amides : (a) ammonia (b) 1° amine (c) 2° amine (d) 3° amine

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. Hunsdiecker reaction is used for the preparation of (a) Alkyl chlorides and bromides (b) Alkyl nitrates and nitrites (c) Ketenes (d) Alcohols

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Last Answer : 3-chloropentane

Which of the following statements concerning SN2 reactions of alkyl halides is not correct? (a) The rate of reaction depends on the concentration of the nucleophile. (b) The rate of reaction depends on the concentration of the alkyl halide. (c) The rate of reaction of a particular alkyl bromide depends on the steric accessibility of the carbon of the C-Br bond. (d) All alkyl iodides react more rapidly than all alkyl chlorides

Description : Which of the following statements concerning SN2 reactions of alkyl halides is not correct? (a) The rate of reaction depends on the concentration of the nucleophile. (b) The rate of reaction depends on the ... carbon of the C-Br bond. (d) All alkyl iodides react more rapidly than all alkyl chlorides

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Which of the alkyl chlorides listed below undergoes dehydrohalogenation in the presence of a strong base to give 2-pentene as the only alkene product? (a) 1-chloropentane (b) 2-chloropentane (c) 3-chloropentane (d) 1-chloro-2-methylbutane

Description : Which of the alkyl chlorides listed below undergoes dehydrohalogenation in the presence of a strong base to give 2-pentene as the only alkene product? (a) 1-chloropentane (b) 2-chloropentane (c) 3-chloropentane (d) 1-chloro-2-methylbutane

Last Answer : 3-chloropentane

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Last Answer : (D) 32 g/mole

For which of the following classes of salts are all of its compounds soluble in water? w) sulfates x) nitrates y) hydroxides z) chlorides

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Last Answer : ANSWER: X -- NITRATES

Consider the following statements: 1. Carbonate hardness is due to bicarbonates. 2. Non-carbonate hardness is due to sulphates and chlorides of Ca and Mg. 3. Both the hardnesses can be removed by lime-soda method. 4. Both the hardnesses can be removed by ion-exchange method. Which of these statements are correct? (a) 1, 2 & 3 only (b) 1, 2 & 4 only (c) 2, 3 & 4 only (d) 1, 2, 3 & 4

Description : Consider the following statements: 1. Carbonate hardness is due to bicarbonates. 2. Non-carbonate hardness is due to sulphates and chlorides of Ca and Mg. 3. Both the hardnesses can be removed by lime-soda method. 4. Both the hardnesses can be ... (b) 1, 2 & 4 only (c) 2, 3 & 4 only (d) 1, 2, 3 & 4

Last Answer : (a) 1, 2 & 3 only

What is 'acid and alkali' according to scientist Lewis ?

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.

Do you expect the carbon hydride of the type (CnH2n+2) to acts as Lewis acid or bases? Justify your answer

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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 chain reaction. (b) It functions by destabilizing the carbocationic intermediate and thereby increases the rate of H+ loss. (c) It serves as a Lewis base catalyst by reacting with Cl2 to generate chloride ions. (d) It serves as a Lewis acid catalyst by reacting with the Cl2 and thereby activates it toward attack by benzene’s π electrons.

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.

Which is defined as a species that accepts a proton? (a) Lewis acid (b) Lewis base (c) Bronsted-Lowry acid (d) Bronsted-Lowry base

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Last Answer : Bronsted-Lowry base

A nucleophile acts as a __________ when it reacts with an electrophile. (a) Bronsted-Lowry acid (b) Arrhenius base (c) Lewis acid (d) Lewis base

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Last Answer : Lewis base

An electrophile acts as a __________ when it reacts with a nucleophile. (a) Bronsted-Lowry base (b) Arrhenius base (c) Lewis acid(d) 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

Which of the following is a Lewis acid? (a) AlCl3 (b) CH3OH (c) NH3 (d) CH3OCH3

Description : Which of the following is a Lewis acid? (a) AlCl3 (b) CH3OH (c) NH3 (d) CH3OCH3

Last Answer : AlCl3

_______ Lewis Acid - Base Complexation Chemistry includes all the common mineral acids. (a) Type – 1 (b) Type – 2 (c) Type – 3 (d) Type – 4

Description : _______ Lewis Acid - Base Complexation Chemistry includes all the common mineral acids. (a) Type – 1 (b) Type – 2 (c) Type – 3 (d) Type – 4

Last Answer : (c) Type – 3

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

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 

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

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

Any species that acts as an electron-pair acceptor a: w) Lewis base x) Bronsted base y) Lewis acid z) Bronsted acid

Description : Any species that acts as an electron-pair acceptor a: w) Lewis base x) Bronsted base y) Lewis acid z) Bronsted acid

Last Answer : ANSWER: Y -- LEWIS ACID

What is the physical condition of beryllium ?

Description : What is the physical condition of beryllium ?

Last Answer : The physical condition of beryllium is gray.

What is the compatibility of beryllium ?

Description : What is the compatibility of beryllium ?

Last Answer : beryllium valence 2 .

What is the boiling point of beryllium ?

Description : What is the boiling point of beryllium ?

Last Answer : The boiling point of beryllium is 2990 degrees Celsius.

What is the melting point of beryllium ?

Description : What is the melting point of beryllium ?

Last Answer : The melting point of beryllium is 1283 degrees Celsius.

What is the relative atomic mass of beryllium ?

Description : What is the relative atomic mass of beryllium ?

Last Answer : : Relative atomic mass of beryllium 9 .

What is the atomic number of beryllium ?

Description : What is the atomic number of beryllium ?

Last Answer : The atomic number of beryllium is four.

What is the symbol of beryllium ?

Description : What is the symbol of beryllium ?

Last Answer : Symbol of beryllium Be

Why is Be (beryllium) called clay metal ?

Description : Why is Be (beryllium) called clay metal ?

Last Answer : The second class elements of the periodic table are called alkali metals. These elements are found in the soil as various compounds.

What is the sign of beryllium ?

Description : What is the sign of beryllium ?

Last Answer : Sign of beryllium: Be.

Atomic number of which of the following elements is greater than that of Fluorine? (1) Sodium (2) Beryllium (3) Nitrogen (4) Boron

Description : Atomic number of which of the following elements is greater than that of Fluorine? (1) Sodium (2) Beryllium (3) Nitrogen (4) Boron

Last Answer : (1) Sodium Explanation: Sodium has higher atomic number (11) than Fluorine (9) The atomic number of Beryllium and Nitrogen are 4 and 7 respectively.

What is the element required for solar energy conversion? (1) Beryllium (2) Tantalum (3) Silicon (4) Ultra pure carbon

Description : What is the element required for solar energy conversion? (1) Beryllium (2) Tantalum (3) Silicon (4) Ultra pure carbon

Last Answer : (3) Silicon Explanation: The most prevalent bulk material for solar cells is crystalline silicon (abbreviated as a group as c-Si), also known as "solar grade silicon". Bulk silicon is ... into multiple categories according to crystallinity and crystal size in the resulting ingot, ribbon, or wafer.

Manganite is an ore/mineral of ______. (1) Beryllium (2) Chromium (3) Manganese (4) Copper

Description : Manganite is an ore/mineral of ______. (1) Beryllium (2) Chromium (3) Manganese (4) Copper

Last Answer : (3) Manganese Explanation: Manganite is an ore mineral of manganese. As a manganese ore, it ranks after pyrolusite and romanechite.

Explain the Reaction of Beryllium chloride with water

Description : Explain the Reaction of Beryllium chloride with water

Last Answer : Ans Beryllium chloride reacts vigorously and exothermically with water with the evolution of acidic, steamy hydrogen chloride gas. This is typical of covalent chlorides.In the first instance, it reacts ... chloride ions can remove one or more of these hydrogen ions to produce hydrogen chloride gas.

Mention the anomalous behaviour of beryllium

Description : Mention the anomalous behaviour of beryllium

Last Answer : Ans Beryllium, the first member of the Group 2 metals, shows anomalous behaviour as compared to magnesium and rest of the members i) Beryllium has exceptionally small atomic and ionic sizes and ... of beryllium, unlike the hydroxides of oother elements in the group, are amphoteric in nature.

Beryllium shows covalent Character in its compounds ,Why?

Description : Beryllium shows covalent Character in its compounds ,Why?

Last Answer : Ans Due to the small size, high ionization energy, and high sublimation energy of beryllium, its lattice and hydration energies are insufficient to provide complete charge separation and the ... compounds therefore, even BeO and BeF2, there is substantial covalent character in the bonding.

Beryllium chloride, BeCl2, melts at 405°C and boils at 520°C. That compares with 714°C and 1412°C for magnesium chloride.Give reason ?

Description : Beryllium chloride, BeCl2, melts at 405°C and boils at 520°C. That compares with 714°C and 1412°C for magnesium chloride.Give reason ?

Last Answer : Ans Be forms covalent compounds

What is the Reason for the anomalous behaviour of beryllium ?

Description : What is the Reason for the anomalous behaviour of beryllium ?

Last Answer : Ans The properties of berrylium the first member of the alkaline earth metal, differ from the rest of the member. Its is mainly because of Its small size and high polarizing power. Relatively ... energy as compared to other members. Absence of vacant d - orbitals in its valence shell.