Read the given passage and answer any four questions.
The symbols for solids, (s) for liquids, (g) for gases, and (aq) for an aqueous solution together with their associated equations can be used to denote the physical states of the reactants and products. If the reactant or product is present as a solution in water, the word aqueous is used. Instead of the symbol(s), an arrow pointing downward $(↓)$ might be used to denote the residue.
Similarly, the symbol(g) for the gaseous state of an evolved gas might be replaced with an arrow going upward $(↑)$ . In the chemical equation, the specific conditions of the reaction, such as temperature, pressure, catalyst, etc., are indicated above or below the arrow.
A. Which of the following balanced chemical equation correctly represent the chemical reaction between magnesium and dil? Sulphuric acid?
(i) $M g (l) + 2 H_{2} S O_{4} (l) \to M g S O_{4} (s) + H_{2}$
(ii) $M g (s) + H_{2} S O_{4} (a q) \to M g S O_{4} (a q) + H_{2} ↑$
(iii) $2 M g (s) + H_{2} S O_{4} (a q) \to 2 M g S O_{4} (a q) + H_{2} ↑$
(iv) $2 M g (s) + 2 H_{2} S O_{4} (l) \to 2 M g S O_{4} (s) + 2 H_{2} (l)$
B. Which symbol can be used to indicate the presence of a gaseous reactant or product?
(i) (𝑔) or ↑
(ii) (l) or l
(iii) (s) or s
(iv) (aq) or ↑
C. Find balance reaction from the following reactions given below.
(i) $2 N a C l + 2 H_{2} O \to 2 N a O H + C l_{2} + H_{2}$
(ii) $C a (O H)_{2} + C l_{2} \to C a O C l_{2} + H_{2} O$
(iii) $N H_{3} \to N_{2} + H_{2}$
(iv) $C_{6} H_{12} O_{6} + O_{2} \to C O_{2} + H_{2} O$
D. Identify 𝑋 and 𝑌 in the following reaction.
$2 N a (s) + 2 H_{2} O (l) \to 2 N a O H (X) + H_{2} (Y)$
(i) $X = (a q) a n d Y = (g)$
(ii) $X = (a q) a n d Y = (l)$
(iii) $X = (s) a n d Y = (l)$
(iv) $X = (s) a n d Y = (g)$
E. Which law is satisfied by balancing a chemical equation?
(i) Conservation of motion
(ii) Conservation of momentum
(iii) Conservation of energy
(iv) Conservation of mass

Question

Read the given passage and answer any four questions.
The symbols for solids, (s) for liquids, (g) for gases, and (aq) for an aqueous solution together with their associated equations can be used to denote the physical states of the reactants and products. If the reactant or product is present as a solution in water, the word aqueous is used. Instead of the symbol(s), an arrow pointing downward $(↓)$ might be used to denote the residue.
Similarly, the symbol(g) for the gaseous state of an evolved gas might be replaced with an arrow going upward $(↑)$ . In the chemical equation, the specific conditions of the reaction, such as temperature, pressure, catalyst, etc., are indicated above or below the arrow.
A. Which of the following balanced chemical equation correctly represent the chemical reaction between magnesium and dil? Sulphuric acid?
(i) $M g (l) + 2 H_{2} S O_{4} (l) \to M g S O_{4} (s) + H_{2}$
(ii) $M g (s) + H_{2} S O_{4} (a q) \to M g S O_{4} (a q) + H_{2} ↑$
(iii) $2 M g (s) + H_{2} S O_{4} (a q) \to 2 M g S O_{4} (a q) + H_{2} ↑$
(iv) $2 M g (s) + 2 H_{2} S O_{4} (l) \to 2 M g S O_{4} (s) + 2 H_{2} (l)$
B. Which symbol can be used to indicate the presence of a gaseous reactant or product?
(i) (𝑔) or ↑
(ii) (l) or l
(iii) (s) or s
(iv) (aq) or ↑
C. Find balance reaction from the following reactions given below.
(i) $2 N a C l + 2 H_{2} O \to 2 N a O H + C l_{2} + H_{2}$
(ii) $C a (O H)_{2} + C l_{2} \to C a O C l_{2} + H_{2} O$
(iii) $N H_{3} \to N_{2} + H_{2}$
(iv) $C_{6} H_{12} O_{6} + O_{2} \to C O_{2} + H_{2} O$
D. Identify 𝑋 and 𝑌 in the following reaction.
$2 N a (s) + 2 H_{2} O (l) \to 2 N a O H (X) + H_{2} (Y)$
(i) $X = (a q) a n d Y = (g)$
(ii) $X = (a q) a n d Y = (l)$
(iii) $X = (s) a n d Y = (l)$
(iv) $X = (s) a n d Y = (g)$
E. Which law is satisfied by balancing a chemical equation?
(i) Conservation of motion
(ii) Conservation of momentum
(iii) Conservation of energy
(iv) Conservation of mass

Infinity Learn · Accepted Answer

A. Mg(s)+H2S4(aq)→MgSO4(aq)+H2↑A balanced chemical equation is one in which the number of atoms of both reactants and products is equal.Hence option (ii) Mg(s)+H2S4(aq)→MgSO4(aq)+H2↑B.To indicate the presence of a gaseous reactant or product, we use (g) or ↑ symbol. Hence option (i) (g) or ↑ is correct.C. The correct answer is (i).2NaCl+2H2O→2NaOH+Cl2+H2is a balanced reaction.The above reaction is called the chlor-alkali process. The electrolysis of a concentrated sodium chloride solution is known as Chlor- an alkali process because of the products formed: a. The products formed in this reaction are 𝑁𝑎𝑂𝐻 (a strong base/alkali), chlorine and hydrogen gas.D. 2Na(s)+2H2O(l)→2NaOH(X)+H2(Y)Since Na reacting with water, NaOH produced will be in an aqueous medium, hence (aq) symbol will be used.H2 is a gas which is evolved during the reaction, so we use the symbol (g) for it.Hence option (i) X=(aq) and Y=(g) is correct.E.According to the law of conservation of mass, the mass of products in a reaction must be equal to the mass of reactants, so the balancing of equations is done to obey this law. Hence option (iv) Conservation of mass is correct

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