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1
JEE Main 2023 (Online) 30th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : In expensive scientific instruments, silica gel is kept in watch-glasses or in semipermeable membrane bags.

Reason (R) : Silica gel adsorbs moisture from air via adsorption, thus protects the instrument from water corrosion (rusting) and / or prevents malfunctioning.

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

A
Both (A) and (R) are true and (R) is the correct explanation of (A)
B
(A) is true but (R) is false
C
(A) is false but (R) is true
D
Both (A) and (R) are true but (R) is not the correct explanation of (A)
2
JEE Main 2023 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
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Out of Syllabus
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Match List I and List II

List I List II
A. Osmosis I. Solvent molecules pass through semi permeable membrane towards solvent side.
B. Reverse osmosis II. Movement of charged colloidal particles under the influence of applied electric potential towards oppositely charged electrodes.
C. Electro osmosis III. Solvent molecules pass through semi permeable membrane towards solution side.
D. Electrophoresis IV. Dispersion medium moves in an electric field.

Choose the correct answer from the options given below :

A
A-III, B-I, C-IV, D-II
B
A-III, B-I, C-II, D-IV
C
A-I, B-III, C-IV, D-II
D
A-I, B-III, C-II, D-IV
3
JEE Main 2023 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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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$$_4$$)$$_2$$
4
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
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-1
Out of Syllabus
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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 15 English

A
(a)
B
(b)
C
(d)
D
(c)
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