Chemistry-
General
Easy
Question
In the electrochemical reaction, 
increasing the concentration of Fe
- increases the cell emf
- increases the current flow
- decreases the cell emf
- alters the pH of the solution
The correct answer is: decreases the cell emf
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K; Ca and Li metals may be arranged in the decreasing order of their standard electrode potentials as:
K; Ca and Li metals may be arranged in the decreasing order of their standard electrode potentials as:
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In the circuit, if the forward voltage drop for the diode is 0.5 V, the current will be
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Physics-General
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The diode used in the circuit shown in the figure has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milli-watt. What should be the value of the resistance
, connected in series with the diode, for obtaining maximum current?
The diode used in the circuit shown in the figure has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milli-watt. What should be the value of the resistance, connected in series with the diode, for obtaining maximum current?
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In the reactions 
A and B are geometrical isomers of RC ≡ CR
In the reactions A and B are geometrical isomers of RC ≡ CR
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The circuit has two oppositely connected ideal diodes in parallel. What is the current flowing in the circuit?
The circuit has two oppositely connected ideal diodes in parallel. What is the current flowing in the circuit?
Physics-General
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A conductor and a semiconductor are connected in parallel as shown in the figure. At a certain voltage both ammeters register the same current. If the voltage of the DC source is increased then the
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Physics-General
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Figure shows a diode connected to an external resistance and an emf. Assuming that the barrier potential developed in diode is 0.5 V, obtain the value of current in the circuit in milli ampere.
Figure shows a diode connected to an external resistance and an emf. Assuming that the barrier potential developed in diode is 0.5 V, obtain the value of current in the circuit in milli ampere.
Physics-General
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Identify the alkyne in the following sequence of reactions:
Identify the alkyne in the following sequence of reactions:
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Trans-2-butene + Br2 gives:
Trans-2-butene + Br2 gives:
Chemistry-General
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(A) Addition of HBr to 1-butene gives two optical isomers.
(R) The product contains one asymmetric carbon.
(A) Addition of HBr to 1-butene gives two optical isomers.
(R) The product contains one asymmetric carbon.
Chemistry-General
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The synthesis of 3-octyne is achieved by adding a bromoalkene into a mixture of sodium amide and an alkyne. The bromoalkane and alkyne respectively are :
The synthesis of 3-octyne is achieved by adding a bromoalkene into a mixture of sodium amide and an alkyne. The bromoalkane and alkyne respectively are :
Chemistry-General
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Identify the product in the reaction
Identify the product in the reaction
Chemistry-General
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The major product formed when 2-bromobutane is treated with alcoholic KOH is :
The major product formed when 2-bromobutane is treated with alcoholic KOH is :
Chemistry-General
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Name the reagent used to bring about the following transformation: but-2-ene to ethanal:
Name the reagent used to bring about the following transformation: but-2-ene to ethanal:
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In the following reaction, the product 'R' is :
In the following reaction, the product 'R' is :
Chemistry-General
