NEETshala
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
Register free to filter questions
● ● ● ● ●

What quantity of electricity is required for complerte reduction of all $ Ag ^+ from 1.0 M AgNO_3 $ is 250 ml aqueous solution ?

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

The quantity of electricity required for the complete reduction of all Ag+ ions from 1.0 M AgNO3 solution of 250 ml is calculated using the formula: Q = nFz, where n is the number of moles of Ag+, F is the Faraday constant (96485 C/mol), and z is the charge on the Ag+ ion (1+). With the given concentration and volume, the number of moles of Ag+ is 0.25, so Q = 0.25 × 96485 × 1 = 24125 C.

● ● ● ● ●

Using 2 g Hg cathode Cd-Hg amalgam is obtained by electrolysis of $ CdCl_2$ then how much ampere electric current should be passed for 100 seconds to obtain Cd-Hg having 20% Cd ? (At.wt Cd = 112.5 g mol-1 )

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

To obtain a Cd-Hg amalgam with 20% Cd, the number of moles of Cd required is 0.2 × (2/112.5) = 0.00356 mol. Using the equation Q = nFz, where n is the number of moles (0.00356), F is the Faraday constant (96485 C/mol), and z is the charge on Cd2+ (2+), we get Q = 0.00356 × 96485 × 2 = 686 C. Since Q = It, where I is the current in amperes and t is time in seconds (100 s), we have I = Q/t = 686/100 = 8.58 A.

● ● ● ● ●

On passing 5 amp current for 2.15 hours through unknown solution of the salt of the Pd metal theoritically 10.64 g of Pd metal get deposited then what is the oxidation state of the Pd in that salt ( $ At.wt Pd = 106.4 g mol ^ {-1} $ )

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

If electrochemical equivalent of the metal is $ 4.0 \times 10 ^ {-4} g /coulomb $ then how much metal will be deposited at cathode on passing 15 amp current for 2 hours where current efficiency is 75 %

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

Theoritically how much quantity of electricity is required to obtained 112 ml of hydrogen gas at STP by electrolysis of acidic water ?

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

For how much times 0.5 A current should be passes through aqueous solution of CuSO_4 to deposit 2 g of Cu by electrolysis ? $ ( At.wt Cu = 63. 5 g mol ^ {-1}$ )

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

When aqueous solution of $ AgNO_3 $ is electrolysed with platinum electrodes its concentration decreases from 4M to 3 M. if same solution is electrolysed with Ag electrode then which of the following observation will be observed ?

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

If 0.5L 2.0 M aqueous solution of $ Ni(NO_3)_2 $ is electrolysed between graphite anode and nickel cathode by passing 9.65 A current for 3 hours then what will be the concentration of $ Ni(NO_3)_2 $ solution?

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

During electrolysis of Ni(NO₃)₂ solution with graphite anode and Ni cathode, Ni²⁺ ions get discharged at the cathode, forming Ni metal. This decreases the concentration of Ni²⁺ ions in the solution. The amount of Ni²⁺ ions reduced can be calculated using the provided current and time data, leading to a final concentration of 0.92 M.

● ● ● ● ●

If 4 L 0.8 M aqueous solution of AgNo_3 is electrolysed between inert electrodes by passing 5A current for 10 hours then what will be the decrease in the concentration of $ Ag ^ + _{(aq)} $ in the solution? ( efficiency of current 80 % )

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

To produce 100 ml $ O_2 gas per minute at 25 ^ \circ C $ temperature and 1 bar pressure by electrolysis of water how much electric currenty should be passsed through the water ? Efficiency of current is 90% .

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.