Which of the following indicators is best suited in the titration of a weak acid versus a strong base? (pKIn values are given in bracket)
Anonymous Quiz
36%
phenolphthalein (8.3 - 10.0)
33%
methyl orange (3.1 - 4.4)
19%
Methyl red (4.2 – 6.3)
12%
Litmus (4.5 – 8.3)
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Two point sources S1 and S2 are 24cm apart. Where should a convex lens of focal length 9cm be placed in between them so that the image is of both sources are formed at the same place [Take real image for S1]
Anonymous Quiz
33%
At 6cm from S1
38%
At 6cm from S2
21%
At 24cm from S1
9%
At 18cm from S1
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The species present in solutions when CO2 dissolved in H2O.
Anonymous Quiz
40%
H3O+, H2CO3, HCO3-, CO32-
30%
H2CO3, CO32- only
17%
HCO3-, CO32- only
14%
CO2, H2CO3 only
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The number of conjugate acid base pairs present in aqueous solution of H3PO3
Anonymous Quiz
26%
2
48%
3
20%
4
6%
5
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the conjugate base of [Al(H2O)3(OH)3] is
Anonymous Quiz
21%
[Al(H2O)3(OH)2]+
34%
[Al(H2O)3(OH)3]-
28%
[Al(H2O)3(OH)3]+
17%
[Al(H2O)2(OH)4]-
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Which of the following is correct
Anonymous Quiz
25%
All Arrhenius acids are also Bronsted acids and all Arrhenius bases
33%
All Bronsted bases are also Lewis bases
20%
All Bronsted acids are also Lewis acids
22%
A strong acid has weak conjugate base but a strong base has a strong conjugate acid
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➪ Amine Short Notes | NJC
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©️ Credit :- Chemistry Notes 🗒️
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A person at rest is observing two trains one coming towards him and other leaving with the same speed 4 m/s. If their whistling frequencies are 240 Hz each, then the number of beats per second heard by the person will be (if velocity of sound is 320 m/s)
Anonymous Quiz
13%
3
41%
6
24%
9
23%
Zero
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