Answer: Option (a) is the correct answer.
Explanation:
In a voltaic cell, salt bridge is used for connecting oxidation and reduction half cells.
The main purpose of using salt bridge in a voltaic cell is that it helps in maintaining electrical neutrality in the internal circuit occurring at anode and cathode of the cell.
Without salt bridge in a voltaic cell there will be imbalance of charges as a result solution in anode compartment will become positively charged whereas solution in cathode compartment will become negatively charged.
Thus, we can conclude that the salt bridge balances charges that may build up as reduction and oxidation occur in a voltaic cell.
(1) The volume of the NO2(g) is greater than the volume of the N2O4(g)
(2) The volume of the NO2(g) is less than the volume of the N2O4(g)
(3) The rate of the forward reaction and the rate of the reverse reaction are equal
(4) The rate of the forward reaction and the rate of the reverse reaction are unequal
Answer: The correct option is (3).
Explanation:
An equilibrium in a reversible chemical reaction is a state in which concentration of reactants and products do not change with time. At equilibrium the rate of forward reaction is equal to the rate of backward reaction.
So, from the given statements the correct statement describing the given system at equilibrium is statement numbered '3'
b. 2O3(g)<=>3O2(g)
c. 2H2O(l)<=>2H2(g)+ O2(g)
d. 2Hg(s)+ O2(g)<=>2HgO(s)
e. C(s)+ O2(g)<=>CO2(g)
Answer:
It is a mixture that is uniform in both composition and properties.
Explanation:
neutrons )
Answer: A) Na+ and O2-
Explanation:
To know the electronic configuration, one has to determine the numbers of electrons present in each atom.
Na+ means a sodium atom that has lost one valence electron. A Sodium atom initially has 11 electrons, but having lost an electron making it 10 electrons remaining with electron configuration of 1s2 2s2 2p6.
O2- means oxygen atom that has gained two valence electrons. An oxygen atom initially has 8 electrons, having gained two electrons makes it 10 electrons with electron configuration of 1s2 2s2 2p6. same as Na+
The purpose of gaining or losing electrons is to attain a stable duplet or octet structure.
The two ions with same electronic configuration are Na and O² .
Electronic configuration is defined as the distribution of electrons of an atom or a molecule in orbitals of an atom or of a molecule.It describes each electron which is moving independently in it's orbital.
Electrons are able to move from one configuration to another by either absorption or emission of a quantum of energy, which is called as a photon.It is useful in understanding the structure of periodic table.
Considering the pair of sodium cation and oxygen anion the sodium atom with one positive charge has 10 electrons and oxygen anion with two negative charge has 10 electrons .
The elements with same number of electrons are called isoelectronic species.
Learn more about electronic configuration,here:
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