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Double Displacement Reaction: Reactions in which ions are exchanged between two reactants forming new compounds are called double displacement reactions.
Example: When the solution of barium chloride reacts with the solution of sodium sulphate, white precipitate of barium sulphate is formed along with sodium chloride.
<i>BaCl2 + Na2SO4 → BaSO4 + 2NaCl</i>
Posted by Umang Pahuja 5 years, 6 months ago
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Meghna Thapar 5 years, 6 months ago
Oxidation and Reduction Reaction:
In this reaction, CuO is changing into Cu. That is, oxygen is being removed from copper oxide. Removal of oxygen from a compound is called reduction, so we can say that copper oxide is being reduced to copper. On the other hand H2 is changing into H2O. That is, oxygen is being added to hydrogen. The addition of oxygen to a substance is called oxidation, so we can say that oxygen is being oxidised to water.
The chemical reaction in which the oxidation and reduction takes place simultaneously is called redox reaction.
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Yogita Ingle 5 years, 6 months ago
The expression of Nationalism was brought by the French Revolution in 1789. Nationalism developed a sense of common identity and shared past or descent. Political movements and struggles by the leaders led to this commonness. It emerged as a force to unify people which later led to the emergence of the nation-state.
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Yogita Ingle 5 years, 6 months ago
Flemish is the region where the majority of population in Belgium lives.
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The four-chambered heart has a distinct advantage over simpler structures: It allows us to send our "dirty" blood to the cleaners-the lungs-and our "clean" blood to the rest of the body without having to mix the two. That system is very efficient. In four chambered heart, left half is completely separated from right half by septa. It serves following two purposes (a) ensures complete segregation of oxygenated and deoxygenated blood (i.e., no mixing). (b) allows a highly efficient supply of oxygenated blood to all parts of the body.a
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Posted by Lucifer ? Morningstar? 5 years, 6 months ago
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Meghna Thapar 5 years, 6 months ago
The guillotine is a machine used to execute people by decapitation (chopping off their heads). A guillotine is made of a heavy blade attached to a rack, which moves up and down on a vertical frame. The guillotine was introduced to France by Dr. Joseph Ignace Guillotine, he was not the inventor of the machine only a lobbyist for it. The idea behind its introduction was to end the spectacle of public torture and to eliminate the severity of pain involved with capital punishment.
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Posted by Dixita Sharma 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
{tex} Given\:pair\:of\: equations:\\\frac{x}{7}+\frac{y}{3}=5{/tex}
{tex}\implies \frac{y}{3}=5-\frac{x}{7}\:---(1){/tex}
{tex}and\:\frac{x}{2}-\frac{y}{9}=6{/tex}
{tex}\implies \frac{x}{2}-\frac{y}{3}\times \frac{1}{3}=6\:---(2){/tex}
{tex}substitute \:(1)\:in \: equation\:(2),\: we\:get{/tex}
{tex}\implies \frac{x}{2}-(5-\frac{x}{7})\times \frac{1}{3}=6\:---(2){/tex}
{tex}\implies \frac{x}{2}-\frac{5}{3}+\frac{x}{21}=6{/tex}
{tex}\implies \frac{x}{2}+\frac{x}{21}=6+\frac{5}{3}{/tex}
{tex}\implies \frac{21x+2x}{42}=\frac{18+5}{3}{/tex}
{tex}\implies \frac{23x}{42}=\frac{21}{3}{/tex}
{tex}\implies x = \frac{23}{3}\times \frac{42}{23}{/tex}
{tex}\implies x = 14\:--(3){/tex}
{tex}put \: x=14 \: in \: equation \:(1),\\we\:get{/tex}
{tex}\frac{y}{3}=5-\frac{14}{7}{/tex}
{tex}\implies \frac{y}{3}=5-2{/tex}
{tex}\implies y = 3\times 3 = 9{/tex}
Therefore,
{tex}x = 14 , \: y = 9{/tex}
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Dawn of the century was written by E.T. Paull in 1900. The picture on the famous book 'Dawn of the century' indicates: 1. There is an angle of progress, bearing the flag of the new century and is gently perched on a wheel with wings symbolizing time.
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Yogita Ingle 5 years, 6 months ago
The main aim of French revolution is to create a sense of col collective identity amongst the French people.
. French revolution led to the transfer of sovereignty from the monarchy to a body of French citizens
. To clear expression of nationalism
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Meghna Thapar 5 years, 6 months ago
On 4 February 1948, Ceylon was granted independence as the Dominion of Ceylon. Dominion status within the British Commonwealth was retained for the next 24 years until 22 May 1972 when it became a republic and was renamed the Republic of Sri Lanka. Kandyan Kingdom falling into the hands of the British Empire and deposing of king Sri Vikrama Rajasingha started the history of British Ceylon It ended over 2300 years of Sinhalese monarchy rule on the island. The British rule on the island lasted until 1948 when the country gained independence.
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