1
JEE Main 2023 (Online) 31st January Evening Shift
+4
-1
The incorrect statement for the use of indicators in acid-base titration is :
A
Phenolphthalein is a suitable indicator for a weak acid vs strong base titration.
B
Methyl orange may be used for a weak acid vs weak base titration.
C
Methyl orange is a suitable indicator for a strong acid vs weak base titration.
D
Phenolphthalein may be used for a strong acid vs strong base titration.
2
JEE Main 2023 (Online) 31st January Morning Shift
+4
-1

When $$\mathrm{Cu}^{2+}$$ ion is treated with $$\mathrm{KI}$$, a white precipitate, $$\mathrm{X}$$ appears in solution. The solution is titrated with sodium thiosulphate, the compound $$\mathrm{Y}$$ is formed. $$\mathrm{X}$$ and $$\mathrm{Y}$$ respectively are

A
 $$\mathrm{X=CuI_2}$$ $$\mathrm{Y=Na_2S_4O_6}$$
B
 $$\mathrm{X=Cu_2I_2}$$ $$\mathrm{Y=Na_2S_4O_6}$$
C
 $$\mathrm{X=CuI_2}$$ $$\mathrm{Y=Na_2S_2O_3}$$
D
 $$\mathrm{X=Cu_2I_2}$$ $$\mathrm{Y=Na_2S_4O_5}$$
3
JEE Main 2023 (Online) 25th January Evening Shift
+4
-1

When the hydrogen ion concentration [H$$^+$$] changes by a factor of 1000, the value of pH of the solution __________

A
decreases by 2 units
B
increases by 2 units
C
decreases by 3 units
D
increases by 1000 units
4
JEE Main 2023 (Online) 24th January Evening Shift
+4
-1

Choose the correct representation of conductometric titration of benzoic acid vs sodium hydroxide.

A
B
C
D
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