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1
JEE Main 2023 (Online) 29th January Morning Shift
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Which of the following salt solutions would coagulate the colloid solution formed when $$\mathrm{FeCl_3}$$ is added to $$\mathrm{NaOH}$$ solution, at the fastest rate?

A
10 mL of 0.15 mol dm$$^{-3}$$ CaCl$$_2$$
B
10 mL of 0.2 mol dm$$^{-3}$$ AlCl$$_3$$
C
10 mL of 0.1 mol dm$$^{-3}$$ Na$$_2$$SO$$_4$$
D
10 mL of 0.1 mol dm$$^{-3}$$ Ca$$_3$$(PO$$_4$$)$$_2$$
2
JEE Main 2023 (Online) 25th January Morning Shift
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The variation of the rate of an enzyme catalyzed reaction with substrate concentration is correctly represented by graph :

JEE Main 2023 (Online) 25th January Morning Shift Chemistry - Surface Chemistry Question 16 English

A
(a)
B
(b)
C
(d)
D
(c)
3
JEE Main 2023 (Online) 24th January Morning Shift
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Statement I : For colloidal particles, the values of colligative properties are of small order as compared to values shown by true solutions at same concentration.

Statement II : For colloidal particles, the potential difference between the fixed layer and the diffused layer of same charges is called the electrokinetic potential or zeta potential.

In the light of the above statements, choose the correct answer from the options given below

A
Both Statement I and Statement II are false
B
Statement I is true and Statement II is false
C
Both Statement I and Statement II are true
D
Statement I is false but Statement II is true
4
JEE Main 2022 (Online) 29th July Evening Shift
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Given below are the critical temperatures of some of the gases:

Gas Critical temperature (K)
He 5.2
CH$$_4$$ 190.0
CO$$_2$$ 304.2
NH$$_3$$ 405.5

The gas showing least adsorption on a definite amount of charcoal is

A
He
B
CH$$_4$$
C
CO$$_2$$
D
NH$$_3$$
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