Q2 Define
(a) Combination reaction
(b) Decomposition reaction
(c)displacement reaction
(d) Double displacement reaction
(e) Strong acids & bases
(f) weak acids & bases
(g) Aqua regia
(h) Reactivity series (learn the series also)
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Q2 Define
(a) Combination reaction
(b) Decomposition reaction
(c)displacement reaction
(d) Double displacement reaction
(e) Strong acids & bases
(f) weak acids & bases
(g) Aqua regia
(h) Reactivity series (learn the series also)
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Answer:
2) a. A combination reaction is a reaction where two or more elements or compounds combine to form a single compound.
b. A decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more elements or new compounds.
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(a) The reaction in which two or more reactants combine to form a single product is known as combination reaction.
2Mg + O2 -----> 2MgO
(b) The reaction in which a single reactant decomposes to form one or more product is known as decomposition reaction.
It is of three types:
Thermal decomposition reaction: The reaction in which the reactant decomposes in the presence of heat.
2FeSO4 -----> Fe2O3 + SO2 + SO3
Photo decomposition reaction: The reaction in which the reactant decomposes in the presence of light.
2AgCl -----> 2Ag + Cl2
Electric decomposition reaction: The reaction in which the reactant decomposes in the presence of electric current.
2H2O -----> 2H2 + O2
(c) The reaction in which a more reactive metal displaces less reactive metal from its salt solution is known as displacement reaction.
Fe + CuSO4 -----> FeSO4 + Cu
(d) The reaction in which two compounds interchange their ions is known as double displacement reaction.
Na2S + 2HCl -----> 2NaCl + H2S
(e) A strong acid or strong base is one that ionizes completely in a solution.
Strong Acid -----> Hydrochloric acid (HCl)
Strong Base -----> Caustic soda (NaOH)
(f) A weak acid or weak base is one that does not ionize completely in a solution.
Weak Acid -----> Acetic acid (CH3COOH)
Weak Base -----> Hydrofluoric base (HF)
(g) Aqua Regia is a mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio 3 : 1 which is highly corrosive and can dissolve even gold and Platinum. it is also known as Royal water.
(h) Reactivity series is a series of metals arranged by their reactivity from highest to lowest.
Reactivity Series of Metals and Ions Formed
Caesium Cs+
Francium Fr+
Rubidium Rb+
Potassium K+
Sodium Na+
Lithium Li+
Barium Ba2+
Radium Ra2+
Strontium Sr2+
Calcium Ca2+
Magnesium Mg2+
Beryllium Be2+
Aluminium Al3+
Titanium Ti4+
Manganese Mn2+
Zinc Zn2+
Chromium Cr3+
Iron Fe3+
Cadmium Cd2+
Cobalt Co2+
Nickel Ni2+
Tin Sn2+
Lead Pb2+
Hydrogen H+ (Non-Metal, Reference for Comparison)
Antimony Sb3+
Bismuth Bi3+
Copper Cu2+
Tungsten W3+
Mercury Hg2+
Silver Ag+
Platinum Pt4+
Gold Au3+
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