`AICI_3` fumes in moist air due to its hydrolysis
b) Al metal is stable in dry air because of protective oxide layer.
c) `p pi -p pi` back bonding does not occur in halides of aluminium because of larger size.
d) Anhydrous `AICI_3` cannot be prepared by heating `AlCl_3 . 6H_2 O`.
Correct statements are
`AICI_3` fumes in moist air due to its hydrolysis
b) Al metal is stable in dry air because of protective oxide layer.
c) `p pi -p pi` back bonding does not occur in halides of aluminium because of larger size.
d) Anhydrous `AICI_3` cannot be prepared by heating `AlCl_3 . 6H_2 O`.
Correct statements are
A
a , b only
B
b,c only
C
a,c,d only
D
All of these
Text Solution
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The correct Answer is:
D
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a) AlCl_(3) fumes in moist air due to its hydro lysis b) Al metal is stable in dry air because of protective oxide layer. c) ppi-ppi back bonding does not occur in halides of aluminium because of larger size. d) AICI_(3) achieves stability by forming a dimer. Correct statements are
Aluminium is stable in air and water inspite of the fact that it is reactive metal. The reason is that a thin film of its oxide, if formed on its surface which makes it passive for further attack. The layer is so useful that in industry, it is purposely deposited by an electrolytric process called anodizing. Reaction of aluminium with oxygen is highyl exothermic and is called thermite reaction 2Al(s)+(3)/(2)O_(2)(g)rarr Al_(2)O_(3)(s), Delta H=-1670 kJ Thermite reaction finds applications in the metallurgical extraction of many metals from their oxides and for welding of metals. The drawback is that to start the reaction, high temperature is required for which an ignition mixture is used. Anodised aluminium is
Aluminium is stable in air and water inspite of the fact that it is reactive metal. The reason is that a thin film of its oxide, if formed on its surface which makes it passive for further attack. The layer is so useful that in industry, it is purposely deposited by an electrolytric process called anodizing. Reaction of aluminium with oxygen is highyl exothermic and is called thermite reaction 2Al(s)+(3)/(2)O_(2)(g)rarr Al_(2)O_(3)(s), Delta H=-1670 kJ Thermite reaction finds applications in the metallurgical extraction of many metals from their oxides and for welding of metals. The drawback is that to start the reaction, high temperature is required for which an ignition mixture is used. Thermite mixture used for welding is
An organic compound (A) underset(Cl)underset(|)CH_2 - CH_2 - underset(Cl)underset(CH_2) on reduction with red P_4 and Hl gives propane (A) on hydrolysis by an alkali followed by oxidation gives B(C_3 H_4 O_4) , which on heating gives (C). Both (B) and (C) gice effervescencence with sodium hydrogen carbonate. (B) on reacting with alcohol gives (D) , C_7 H_(12) O_8 a well known synthetic reagent. Now answer the following questions. Compound (C) underset(Delta)overset(P_4 O_(10))to Product (F). Hence , the product (F) may be
An organic compound (A) underset(Cl)underset(|)CH_2 - CH_2 - underset(Cl)underset(CH_2) on reduction with red P_4 and Hl gives propane (A) on hydrolysis by an alkali followed by oxidation gives B(C_3 H_4 O_4) , which on heating gives (C). Both (B) and (C) gice effervescencence with sodium hydrogen carbonate. (B) on reacting with alcohol gives (D) , C_7 H_(12) O_8 a well known synthetic reagent. Now answer the following questions. Compound (A) underset((ii) H^+)overset((i) KCN//C_2H_2OH)to product (G). The product (G) is
An organic compound (A) underset(Cl)underset(|)CH_2 - CH_2 - underset(Cl)underset(CH_2) on reduction with red P_4 and Hl gives propane (A) on hydrolysis by an alkali followed by oxidation gives B(C_3 H_4 O_4) , which on heating gives (C). Both (B) and (C) gice effervescencence with sodium hydrogen carbonate. (B) on reacting with alcohol gives (D) , C_7 H_(12) O_8 a well known synthetic reagent. Now answer the following questions. (D) +benzaladehyde underset((ii) H^+)overset((i) "pyridine," Delta)to manor product (E). The product (E) is
alpha - amino acids are high melting crystalline solids because of the zwitterion structure. They are moderately soluble in water. In acidic medium, alpha - amino acids exist as cations (I) and thus migrate towards cathode under the influence of an electric field. On the other hand, in alkaline medium, alpha - amino acids exist as anions (III) and thus migrate towards anode under the influence of an electric field. However, at some intermediate value of p^(H) , the concentration of the cationic form (I) and anionic form (III) will become equal and consequently the alpha - amino acid will exist primarily as the neutral dipolar ion (II). At this p^(H) , there would be no net migration of the amino acid in an electric field. This p^(H) at which there is no net migration of the amino acid under the influence of an applied electric field is called isoelectric point (pI). Each amino acid has a characteristic isoelectric point. The pH of an amino acid that does not have an ionisable side chain such as alanine isd average of pK_(a) values of the carboxyl group and the protonated amino group. H_(3)overset(+)(N)-overset("R")overset("|")("C")H-COOH overset(" "OH^(-)" ")underset(" "H^(+)" ")hArr H_(3)overset(+)(N)-underset("Zwitterion (II)")(overset("R")overset("|")("C")H)-COO^(-)overset(" "OH^(-)" ")underset(" "H^(+)" ")hArr underset((III))(overset(+)(N)-overset("R")overset("|")("C")H)-COO^(-) Further, the alpha - carbon of all the amino acids (except glycine) is chiral (asymmetric) and hence amino acids can exist in teo stereoisomeric forms i.e., D and L. However, all the nautrally occurring amino acids belong to the L - series. underset("L(-)Glyceraldehyde")(HO-overset("CHO ")overset("| ")underset(" "CH_(2)OH)underset("| ")("C ")-H)" " underset("L-Amino acid")(H_(2)N-overset("COOH")overset("| ")underset("R ")underset("| ")("C ")-H) In alanine, carboxyl group ionises at pK_(a1)=2.34 and ammonium ion at pK_(a2)=9.69 . The isoelectric point of the amino acid is at p^(H) .
alpha - amino acids are high melting crystalline solids because of the zwitterion structure. They are moderately soluble in water. In acidic medium, alpha - amino acids exist as cations (I) and thus migrate towards cathode under the influence of an electric field. On the other hand, in alkaline medium, alpha - amino acids exist as anions (III) and thus migrate towards anode under the influence of an electric field. However, at some intermediate value of p^(H) , the concentration of the cationic form (I) and anionic form (III) will become equal and consequently the alpha - amino acid will exist primarily as the neutral dipolar ion (II). At this p^(H) , there would be no net migration of the amino acid in an electric field. This p^(H) at which there is no net migration of the amino acid under the influence of an applied electric field is called isoelectric point (pI). Each amino acid has a characteristic isoelectric point. The pH of an amino acid that does not have an ionisable side chain such as alanine isd average of pK_(a) values of the carboxyl group and the protonated amino group. H_(3)overset(+)(N)-overset("R")overset("|")("C")H-COOH overset(" "OH^(-)" ")underset(" "H^(+)" ")hArr H_(3)overset(+)(N)-underset("Zwitterion (II)")(overset("R")overset("|")("C")H)-COO^(-)overset(" "OH^(-)" ")underset(" "H^(+)" ")hArr underset((III))(overset(+)(N)-overset("R")overset("|")("C")H)-COO^(-) Further, the alpha - carbon of all the amino acids (except glycine) is chiral (asymmetric) and hence amino acids can exist in teo stereoisomeric forms i.e., D and L. However, all the nautrally occurring amino acids belong to the L - series. underset("L(-)Glyceraldehyde")(HO-overset("CHO ")overset("| ")underset(" "CH_(2)OH)underset("| ")("C ")-H)" " underset("L-Amino acid")(H_(2)N-overset("COOH")overset("| ")underset("R ")underset("| ")("C ")-H) Which of structural formula of lysine (NH_(2)-overset("COOH")overset("| ")("C ")H-CH_(2)-CH_(2)-CH_(2)-CH_(2)NH_(2)) at pH 13 ?
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It is tempting to think that all possible transitions are permissible, and that an atomic spectrum arises from the transition of the electron from any initial orbital to any other orbital. However, this is not so, because a photon has an intrinsic spin angular momentum of sqrt2 (h)/(2pi) corresponding to S = 1 although it has no charge and no rest mass. On the other hand, an electron has got two types of angular momentum : Orbital angular momentum, L=sqrt(l(l+1))h/(2pi) and spin angular momentum, arising from orbital motion and spin motion of electron respectively. The change in angular momentum of the electron during any electronic transition must compensate for the angular momentum carries away by the photon. to satisfy this condition the difference between the azimuthal quantum numbers of the orbital within which transition takes place must differ by one. Thus, an electron in a d-orbital (1 = 2) cannot make a transition into an s = orbital (I = 0) because the photon cannot carry away enough angular momentum. An electron as is well known, possess four quantum numbers n, I, m and s. Out of these four I determines the magnitude of orbital angular momentum (mentioned above) while (2n m determines its z-components as m((h)/(2pi)) the permissible values of only integers right from -1 to + l. While those for I are also integers starting from 0 to (n − 1). The values of I denotes the sub shell. For I = 0, 1, 2, 3, 4,..... the sub-shells are denoted by the symbols s, p, d, f, g, .... respectively The orbital angular momentum of an electron in p-orbital makes an angle of 45^@ from Z-axis. Hence Z-component of orbital angular momentum of election is :
AAKASH SERIES-ELEMENTS OF BORON FAMILY-OBJECTIVE EXERCISE -1 (Aluminium Chloride)
- Al Cl3 is
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- Which of the following statement about AICI3 is not correct ?
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- Which of the following is not correct ?
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- In Al2 Cl6 the covalency of aluminium is
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- AICI3 fumes in moist air due to its hydrolysis b) Al metal is stable...
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- AICI3 exists as a dimer through halgen bridged bonds. (R): AICI3 ge...
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