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प्र: Trichloroacetaldehyde was subject to Cannizzaro's reaction by using NaOH. The mixture of the products contains sodium trichloroacetate and another compound. The other compound is : 1392 0

उत्तर : 2. "2, 2, 2-Trichloroethanol"
व्याख्या :
Answer: B) 2, 2, 2-Trichloroethanol Explanation: Cl|Cl-C-CHO|Cl→Cannizzaro's ReactionNaOH Cl|Cl-C-COONa|Cl+ Cl|Cl-C-CH2 |21Cl-OH

प्र: The reduction potential of hydrogen half-cell will be negative if :(1) PH2= 2 atm and [H+] = 2.0 M(2) PH2= 1 atm and [H+] = 2.0 M(3) PH2= 1 atm and [H+] = 1.0 M(4) PH2= 2 atm and [H+] = 1.0 M 1906 0

उत्तर : 4. "Option 4"
व्याख्या :
Answer: D) Option 4 Explanation: H+-e-→12H2 Apply Nernst equation E=0-0.0591logPH212H+ E=-0.0591log2121 Therefore E is Negative

प्र: Among the following the maximum covalent character is shown by the compound (1)MgCl2 (2)FeCl2 (3)SnCl2 (4) AlCl3 2767 0

उत्तर : 4. "Option 4"
व्याख्या :
Answer: D) Option 4 Explanation: According to Fajans rule, cation with greater charge and smaller size favours covalency.

प्र: Boron cannot form which one of the following anions? (1) BO2- (2) BF63- (3) BH4- (4) B(OH)4- 2185 0

उत्तर : 2. "Option 2"
व्याख्या :
Answer: B) Option 2 Explanation: Due to absence of low lying vacant d orbital in B, sp3d2hybridization is not possible hence BF63-will not formed.

प्र: Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides? (1) K2O 2768 0

उत्तर : 2. "Option 2"
व्याख्या :
Answer: B) Option 2 Explanation: While moving from left to right in periodic table basic character of oxide of elements will decrease. ∴→Increasing basic strengthAl2O3

प्र: The population of a city is 415600.It increased by 25% in the first year and decreased by 30% in the second year.What is the population of the city at the end of second year? 1765 0

उत्तर :
व्याख्या :
As per given data, P = 415600, R1= 25% incresed, R2 = 30% decreased Population of the city at the end of the second year= 363650.

प्र: A group consists of 4 couples in which each of the 4 boys have one girl friend.In how many ways they can be arranged in a straight line such that boys and girls occupies alternate positions? 2072 0

उत्तर :
व्याख्या :
Answer : 1152 Total positions are 8. In that boys can be arranged in 4 places and girls can be arranged in 4 places and hence this can be done in 2 ways. i.e => 4! x 4! x 2 = 24 x 24 x 2=1152.

प्र: A sales boy is allowed 412 % discount on the total sales made by him plus a bonus of 14% on the sales over Rs.12,000.If his total earnings were Rs.2400, then his total sales(in Rs.) are ? 1607 0

उत्तर : 4. "Rs.50,589.47"
व्याख्या :
Answer: D) Rs.50,589.47 Explanation: Let the total earnings be Rs.x Then 412% of x + 14% of (x-12000) =2400 ⇒92×x100+14×x-12000100=2400 => x=50,589.47

प्र: Trichloroacetaldehyde was subject to Cannizzaro's reaction by using NaOH. The mixture of the products contains sodium trichloroacetate and another compound. The other compound is : 1392 05b5cc783e4d2b4197775023a

उत्तर : 2. "2, 2, 2-Trichloroethanol" व्याख्या :Answer: B) 2, 2, 2-Trichloroethanol Explanation: Cl|Cl-C-CHO|Cl→Cannizzaro's ReactionNaOH Cl|Cl-C-COONa|Cl+ Cl|Cl-C-CH2 |21Cl-OH

प्र: The reduction potential of hydrogen half-cell will be negative if :(1) PH2= 2 atm and [H+] = 2.0 M(2) PH2= 1 atm and [H+] = 2.0 M(3) PH2= 1 atm and [H+] = 1.0 M(4) PH2= 2 atm and [H+] = 1.0 M 1906 05b5cc783e4d2b41977750235

उत्तर : 4. "Option 4" व्याख्या :Answer: D) Option 4 Explanation: H+-e-→12H2 Apply Nernst equation E=0-0.0591logPH212H+ E=-0.0591log2121 Therefore E is Negative

प्र: Among the following the maximum covalent character is shown by the compound (1)MgCl2 (2)FeCl2 (3)SnCl2 (4) AlCl3 2767 05b5cc783e4d2b41977750230

उत्तर : 4. "Option 4" व्याख्या :Answer: D) Option 4 Explanation: According to Fajans rule, cation with greater charge and smaller size favours covalency.

प्र: Boron cannot form which one of the following anions? (1) BO2- (2) BF63- (3) BH4- (4) B(OH)4- 2185 05b5cc783e4d2b4197775022b

उत्तर : 2. "Option 2" व्याख्या :Answer: B) Option 2 Explanation: Due to absence of low lying vacant d orbital in B, sp3d2hybridization is not possible hence BF63-will not formed.

प्र: Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides? (1) K2O 2768 05b5cc783e4d2b41977750226

उत्तर : 2. "Option 2" व्याख्या :Answer: B) Option 2 Explanation: While moving from left to right in periodic table basic character of oxide of elements will decrease. ∴→Increasing basic strengthAl2O3

प्र: The population of a city is 415600.It increased by 25% in the first year and decreased by 30% in the second year.What is the population of the city at the end of second year? 1765 05b5cc783e4d2b41977750224

उत्तर : व्याख्या :As per given data, P = 415600, R1= 25% incresed, R2 = 30% decreased Population of the city at the end of the second year= 363650.

प्र: A group consists of 4 couples in which each of the 4 boys have one girl friend.In how many ways they can be arranged in a straight line such that boys and girls occupies alternate positions? 2072 05b5cc783e4d2b41977750223

उत्तर : व्याख्या :Answer : 1152 Total positions are 8. In that boys can be arranged in 4 places and girls can be arranged in 4 places and hence this can be done in 2 ways. i.e => 4! x 4! x 2 = 24 x 24 x 2=1152.

प्र: A sales boy is allowed 412 % discount on the total sales made by him plus a bonus of 14% on the sales over Rs.12,000.If his total earnings were Rs.2400, then his total sales(in Rs.) are ? 1607 05b5cc783e4d2b4197775021e

उत्तर : 4. "Rs.50,589.47" व्याख्या :Answer: D) Rs.50,589.47 Explanation: Let the total earnings be Rs.x Then 412% of x + 14% of (x-12000) =2400 ⇒92×x100+14×x-12000100=2400 => x=50,589.47

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प्र: Trichloroacetaldehyde was subject to Cannizzaro's reaction by using NaOH. The mixture of the products contains sodium trichloroacetate and another compound. The other compound is : 1392 0

उत्तर : 2. "2, 2, 2-Trichloroethanol"
व्याख्या :
Answer: B) 2, 2, 2-Trichloroethanol Explanation: Cl|Cl-C-CHO|Cl→Cannizzaro's ReactionNaOH Cl|Cl-C-COONa|Cl+ Cl|Cl-C-CH2 |21Cl-OH

प्र: The reduction potential of hydrogen half-cell will be negative if :(1) PH2= 2 atm and [H+] = 2.0 M(2) PH2= 1 atm and [H+] = 2.0 M(3) PH2= 1 atm and [H+] = 1.0 M(4) PH2= 2 atm and [H+] = 1.0 M 1906 0

उत्तर : 4. "Option 4"
व्याख्या :
Answer: D) Option 4 Explanation: H+-e-→12H2 Apply Nernst equation E=0-0.0591logPH212H+ E=-0.0591log2121 Therefore E is Negative

प्र: Among the following the maximum covalent character is shown by the compound (1)MgCl2 (2)FeCl2 (3)SnCl2 (4) AlCl3 2767 0

उत्तर : 4. "Option 4"
व्याख्या :
Answer: D) Option 4 Explanation: According to Fajans rule, cation with greater charge and smaller size favours covalency.

प्र: Boron cannot form which one of the following anions? (1) BO2- (2) BF63- (3) BH4- (4) B(OH)4- 2185 0

उत्तर : 2. "Option 2"
व्याख्या :
Answer: B) Option 2 Explanation: Due to absence of low lying vacant d orbital in B, sp3d2hybridization is not possible hence BF63-will not formed.

प्र: Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides? (1) K2O 2768 0

उत्तर : 2. "Option 2"
व्याख्या :
Answer: B) Option 2 Explanation: While moving from left to right in periodic table basic character of oxide of elements will decrease. ∴→Increasing basic strengthAl2O3

प्र: The population of a city is 415600.It increased by 25% in the first year and decreased by 30% in the second year.What is the population of the city at the end of second year? 1765 0

उत्तर :
व्याख्या :
As per given data, P = 415600, R1= 25% incresed, R2 = 30% decreased Population of the city at the end of the second year= 363650.

प्र: A group consists of 4 couples in which each of the 4 boys have one girl friend.In how many ways they can be arranged in a straight line such that boys and girls occupies alternate positions? 2072 0

उत्तर :
व्याख्या :
Answer : 1152 Total positions are 8. In that boys can be arranged in 4 places and girls can be arranged in 4 places and hence this can be done in 2 ways. i.e => 4! x 4! x 2 = 24 x 24 x 2=1152.

प्र: A sales boy is allowed 412 % discount on the total sales made by him plus a bonus of 14% on the sales over Rs.12,000.If his total earnings were Rs.2400, then his total sales(in Rs.) are ? 1607 0

उत्तर : 4. "Rs.50,589.47"
व्याख्या :
Answer: D) Rs.50,589.47 Explanation: Let the total earnings be Rs.x Then 412% of x + 14% of (x-12000) =2400 ⇒92×x100+14×x-12000100=2400 => x=50,589.47