Question

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Answer 1

$\large\underline\mathfrak\red{Q6. \: Answer \: :- }$

Difference between displacement and double displacement reaction.

• A displacement reaction is the one when a more reactive substance displaces a less reactive one from its salt solution whereas a double displacement reaction is the one where a mutual exchange of ions happens between two compounds.

$\large\underline\mathfrak\red{Example \: of \: displacement \: reaction \: : }$

$\bf{AB + C → A + BC }$

Note :- Here ABC are the elements. It is a general form of reaction.

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Answer 2

Explanation:

In a displacement reaction, a more reactive element replaces a less reactive element from a compound. ... In a displacement reaction, one displacement takes place. A + BX → AX + B. In a double displacement reaction, two displacements take place to complete the reaction.

Magnesium is highly reactive in nature. - When magnesium metal reacts with very dilute nitric acid it gives magnesium nitrate (Mg(NO3)2). Along with magnesium nitrate highly flammable hydrogen gas (H2) is also produced. Thus, magnesium on reaction with very dilute HNO3 gives H2.

Sodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and hydrogen gas (H2). The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic.

Zinc reacts easily with the acid to produce hydrogen bubbles. It is a single displacement reaction in which hydrogen is displaced by zinc metal to form hydrogen gas and a salt, zinc chloride

When magnesium ribbon is burnt in the air, it combines with oxygen to form white powder magnesium oxide MgO with the release of heat and light. It forms a white powder of magnesium oxide. Magnesium gives up two electrons to oxygen atoms to form this powdery product.

When electric current is passed through water, water dissociates into hydrogen and oxygen. Hydrogen is deposited over negative pole and oxygen is deposited over positive pole. Deposition of hydrogen and oxygen at different poles is visible in the form of bubbles.

When it comes to ammonia, it is a base because ammonia includes an extensive pair of electron atoms on nitrogen atom that is donated to the acid which is hydrogen chloride. If you mix Ammonia as well as Hydrogen chloride, you will get ammonium chloride. It is given by NH3 (g) + HCl (g) → NH4Cl(s).

The substance which gains oxygen or loses hydrogen during the reaction, it is said to be oxidised and the substance which loses oxygen or gains hydrogen during the reaction, it is said to be reduced

Answer. (a) Metal M = Silver and gas X2 is chlorine gas.

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