This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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93. The correct option is 3). Tooth enamel is primarily composed of calcium phosphate in the form of hydroxyapatite. 94. The correct option is 2). Potassium hydroxide (KOH) is a strong base. Bases turn red litmus paper blue and have no effect on blue litmus paper. Therefore, red litmus turns to blue and blue litmus remains blue. 95. The correct option is 1). Let's match each reaction type: a)* Zn_(s) + 2AgNO_3(aq) → Zn(NO_3)_2(aq) + 2Ag_(s) This is a displacement reaction where zinc displaces silver from silver nitrate. So, (a) matches with (iii). b)* NaCl_(s) + AgNO_3(aq) → AgCl_(s) + NaNO_3(aq) This is a double displacement reaction where the ions of two compounds exchange places. So, (b) matches with (iv). c)* CaCO_3(s) → CaO_(s) + CO_2(g) This is a decomposition reaction where a single compound breaks down into two or more simpler substances. So, (c) matches with (i). d)* Mg_(s) + O_2(g) → 2MgO_(s) This is a combination reaction where two or more reactants combine to form a single product. So, (d) matches with (ii). Therefore, the correct matching is (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii). 96. The correct option is 4). To find the value of x, we need to balance the chemical equation: C_3H_8 + xO_2 → yCO_2 + zH_2O Step 1: Balance Carbon (C) atoms. There are 3 carbon atoms on the left side (C_3H_8). So, there must be 3 carbon atoms on the right side. y = 3 The equation becomes: C_3H_8 + xO_2 → 3CO_2 + zH_2O Step 2: Balance Hydrogen (H) atoms. There are 8 hydrogen atoms on the left side (C_3H_8). So, there must be 8 hydrogen atoms on the right side. Since each water molecule (H_2O) has 2 hydrogen atoms, we need 4 water molecules. 2z = 8 z = 4 The equation becomes: C_3H_8 + xO_2 → 3CO_2 + 4H_2O Step 3: Balance Oxygen (O) atoms. Count the total oxygen atoms on the right side: From 3CO_2: 3 × 2 = 6 oxygen atoms. From 4H_2O: 4 × 1 = 4 oxygen atoms. Total oxygen atoms on the right side = 6 + 4 = 10. On the left side, we have xO_2, which means 2x oxygen atoms. 2x = 10 x = 5 The balanced equation is: C_3H_8 + 5O_2 → 3CO_2 + 4H_2O The value of x is 5. That's 2 down. 3 left today — send the next one.