Blog Log in Get Started Free

Chemistry MCQs for NEET — Practice Questions with Answers

Practice free Chemistry NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

All Physics Chemistry Botany Zoology

Chapter Language Difficulty Show only questions I answered incorrectly Register free to filter questions

● ● ● ● ●

For an electrochemical cell, $ Mg| Mg^{2+}_{(C1)} || Br^-_{(C2)} | Br_{2(1)} | Pt $ , what wiil be the change in cell potential, when conc of solution of cathode increase at constant temperature ?

A. increases B. decreases C. No change occurs D. $ E cell=E ^\circ cell $

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

In an electrochemical cell, when the concentration of the solution in the cathode increases, the reaction quotient Q decreases because the concentration of the reactants increases. According to the Nernst equation, $E_{cell} = E^{ ext{cell}} - rac{RT}{nF} ext{ln} Q$, a decrease in Q results in a decrease in the cell potential, E. Therefore, the cell potential decreases.

● ● ● ● ●

Aqueous solution of salt of metal B is stored in a vessel of metal A and aqueous solution of solt of metal c can be stored in the vessel of metal B, then, which of the following is the correct descending order of their strength of reducing agent of A, B and c ?

A. $ A \gt B \gt C $ B. $ A \gt C \gt B $ C. $ C \gt B \gt A $ D. $ C \gt A \gt B $

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

A metal can displace another metal from its salt solution if it is a stronger reducing agent. Since an aqueous solution of a salt of metal B can be stored in a vessel of metal A, metal A is a stronger reducing agent than metal B ($A > B$). Similarly, since an aqueous solution of a salt of metal C can be stored in a vessel of metal B, metal B is a stronger reducing agent than metal C ($B > C$). Therefore, the order of their strength as reducing agents is $C > B > A$.

● ● ● ● ●

Standard oxidation potential of half cells of $ A/A^{2+}, B/B^{2+}, C/C^{2+} and D/D^{2+} $ are in increasing order, then which of the following statement is correct ?

A. solution of salt of $A^{2+}$ can be stored in the vessel of metal B. B. solution of salt of $D^{2+}$ canâ€™t be stored in the vessel of metal C. C. solution of salt of $D^{2+}$ can be stored in the vessel of metal B. D. given all three statements are wrong.

You've reached today's free limit of 20 questions. Log in to keep practising for free.

● ● ● ● ●

For which of the following compound, a graph of mular conductivity and $(molarity)^{1/2} $ is obtained straight line ?

A. CsCl B. $ NH_4 OH $ C. HCOOH D. given all three

You've reached today's free limit of 20 questions. Log in to keep practising for free.

● ● ● ● ●

5 faraday electric charge is passed during electrolysis of molten $cacl_2$ solution, then what moles of Ca obtained at cathode experimentally ?

A. 2.5 mole B. less than 2.5 mole C. more than 2.5 mole D. 5 mole

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

During the electrolysis of molten CaCl_2, calcium ions are reduced at the cathode. According to Faraday's laws of electrolysis, 2 Faradays of charge are required to deposit 1 mole of Ca. Therefore, 5 Faradays would theoretically deposit 2.5 moles of Ca. However, due to practical losses and inefficiencies, the actual amount obtained is less than 2.5 moles.

● ● ● ● ●

When same electric charge is passed through electrolytic cells containing aqueous solutions of $CuSO_4, AgNO_3 and NiSO_4 $ , then what would be prportion of moles of metal obtained at different cathodes respectively ?

A. 2:01:02 B. 2:02:01 C. 1:01:02 D. 1:02:01

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

The number of moles of metal deposited during electrolysis is inversely proportional to the equivalent weight (molar mass divided by the valency). For Cu (Cu^2+), Ag (Ag^+), and Ni (Ni^2+), the valencies are 2, 1, and 2 respectively. Thus, the proportion of moles of metals deposited is inversely proportional to these valencies, giving the ratio 1:2:1.

● ● ● ● ●

What would be the change in PH of the solution, when electrolysis of aqueous solution of $CuSO_4$ is carried out in presence of inert electrodes ?

A. $ P ^ H $ increases B. $P^H$ decreases C. no change in $P^H$ D. canâ€™t be predicted

You've reached today's free limit of 20 questions. Log in to keep practising for free.

● ● ● ● ●

In an experiment of electroplating, 4 ampere electric current is passed for 2 minutes. Hence, m gram Ag is deposited at cathode. If 6 ampere current is passed for 40 second, then what amount Ag is deposited at cathode ?

A. 2m B. 4m C. m/2 D. m/4

You've reached today's free limit of 20 questions. Log in to keep practising for free.

● ● ● ● ●

Which of the following is correct form of the nernst equation to determine the oxidation potential of $Cu/Cu^{2+} $ half cell ?

A. $ E ^ \circ Cu | Cu ^ {2+} = E ^ \circ Cu|Cu ^ {2+} - { RT \over 2F} \times ln [ Cu ^ {2+}] } $ B. $ E ^ \circ Cu | Cu ^ {2+} = E ^ \circ Cu|Cu ^ {2+} +{ RT \over 2F} \times ln [ Cu ^ {2+}] } $ C. $ E ^ \circ Cu | Cu ^ {2+} = E Cu|Cu ^ {2+} - { RT \over 2F} \times ln [ Cu ^ {2+}] } $ D. $ E ^ \circ Cu | Cu ^ {2+} = E Cu|Cu ^ {2+} - { RT \over 2F} \times ln {1 \over [ Cu ^ {2+}] } $

You've reached today's free limit of 20 questions. Log in to keep practising for free.

● ● ● ● ●

What amount of electric charge required for the reduction of 1 mole $Cr_2O_7 ^{2â€“ }into Cr^{3+} $ theoretically ?

A. 6 B. 3 C. 1 D. 4

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Ready to ace NEET?

Free access · No credit card required

Browse All Questions Create Free Account

Frequently Asked Questions

Yes. You can attempt every Chemistry question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.

No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.

The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.