Practice Question and Answer
8Q: 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
5b5cc783e4d2b4197775023a- 1Chloroformfalse
- 22, 2, 2-Trichloroethanoltrue
- 3Trichloromethanolfalse
- 42, 2, 2-Trichloropropanolfalse
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Answer : 2. "2, 2, 2-Trichloroethanol"
Explanation :
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
Q: 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
5b5cc783e4d2b41977750235- 1Option 1false
- 2Option 2false
- 3Option 3false
- 4Option 4true
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Answer : 4. "Option 4"
Explanation :
Answer: D) Option 4 Explanation: H+-e-→12H2 Apply Nernst equation E=0-0.0591logPH212H+ E=-0.0591log2121 Therefore E is Negative
Q: Among the following the maximum covalent character is shown by the compound (1)MgCl2 (2)FeCl2 (3)SnCl2 (4) AlCl3 2767 05b5cc783e4d2b41977750230
5b5cc783e4d2b41977750230- 1Option 1false
- 2Option 2false
- 3Option 3false
- 4Option 4true
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Answer : 4. "Option 4"
Explanation :
Answer: D) Option 4 Explanation: According to Fajans rule, cation with greater charge and smaller size favours covalency.
Q: Boron cannot form which one of the following anions? (1) BO2- (2) BF63- (3) BH4- (4) B(OH)4- 2185 05b5cc783e4d2b4197775022b
5b5cc783e4d2b4197775022b- 1Option 1false
- 2Option 2true
- 3Option 3false
- 4Option 4false
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Answer : 2. "Option 2"
Explanation :
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.
Q: Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides?
(1) K2O 2768 05b5cc783e4d2b41977750226
5b5cc783e4d2b41977750226- 1Option 1false
- 2Option 2true
- 3Option 3false
- 4Option 4false
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Answer : 2. "Option 2"
Explanation :
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
Q: 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
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Answer :
Explanation :
As per given data, P = 415600, R1= 25% incresed, R2 = 30% decreased Population of the city at the end of the second year= 363650.
Q: 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
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Answer :
Explanation :
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.
Q: 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
5b5cc783e4d2b4197775021e- 1Rs.60,145.23false
- 2Rs.54,285.54false
- 3Rs.52,147.85false
- 4Rs.50,589.47true
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Answer : 4. "Rs.50,589.47"
Explanation :
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