2Al + Fe2O3 ——-> Al2O3 + 2Fe
This is a single displacement reaction
Answer: Option (c) is the correct answer.
Explanation:
According to the Born-Lande equation,
E = 
where, 
= Avogadro's constant
r = distance between the anion and cation
M = Medlung constant
= charge on the cation
= charge on the anion
E = lattice energy
According to this expression, lattice energy is inversely proportional to the distance between the cation and anion. And, when we move down a group then there occurs an increase in the atomic radii of the atoms.
As a result, there will occur a decrease in their lattice energy. Since, the anionic part is same in all the given species but the cationic part is different.
In 
the size of magnesium cation is smaller than calcium, barium and strontium ion. Hence, there will be least distance between Mg and Br ions.
Thus, we can conclude that the magnitude of lattice energy will be the highest in .
Answer:
In everyday use, "theory" frequently implies an untested hunch, or a supposition without supporting proof. For scientists, a theory has about the contrary significance. A hypothesis is a very much validated clarification of am aspect of the natural world that can join laws, speculations and realities.
Explanation:
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A precipitate forms from a double displacement reaction or metathesis.
Explanation:
If given two clear solutions and upon reacting a cloudy/insoluble substance forms with the rest of the liquid being clear, a double displacement reaction has been carried out. The insoluble cloudy substance is called precipitate.
- the driving force for the bulk of double displacement reactions is the formation of precipitates.
- from careful observations, a solubility chart has been developed. If the compounds reacting are known, using the chart, a chemist can predict whether a precipitate will form or not.
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The CNO cycle<span> (for </span>carbon–nitrogen–oxygen<span>) is one of the two known sets of fusion reactions by which stars convert hydrogen to helium, the </span>other<span> being the proton–proton chain reaction. Unlike the latter, the CNO </span>cycle<span> is a catalytic </span>cycle<span>.</span>
