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.
ScanSolve AI Answer
6. The correct option is D. Enthalpy of combustion ( H_c) is always negative because combustion reactions are always exothermic, releasing heat. Enthalpy of neutralization ( H_neut) is always negative because the reaction between an acid and a base is always exothermic. Enthalpy of formation ( H_f) can be positive (endothermic) or negative (exothermic). Enthalpy of solution ( H_sol) can be positive (endothermic) or negative (exothermic). 7. The correct option is D. Covalent compounds are formed between two non-metal atoms by sharing electrons. HCl consists of hydrogen (non-metal) and chlorine (non-metal), forming a covalent bond. MgCl_2, KCl, and NaCl are all ionic compounds formed between a metal (Mg, K, Na) and a non-metal (Cl). 8. The correct option is A. A soapy touch is a characteristic property of basic solutions. Basic solutions have a pH greater than 7. Among the given options, 12 is the only pH value that indicates a strongly basic solution. 9. The correct option is C. Element X has a valency of +3, meaning it forms an ion X^3+. Chlorine (Cl) has a valency of -1, meaning it forms an ion Cl^-. To form a neutral compound, one X^3+ ion will combine with three Cl^- ions. Therefore, the formula is XCl_3. 10. The correct option is B. According to Avogadro's Law, equal volumes of all gases at the same temperature and pressure contain the same number of molecules. CH_4(g) and NH_3(g) are both gases, and if they have equal volumes at the same temperature and pressure, they must contain the same number of molecules. They would not have the same number of atoms because CH_4 has 5 atoms per molecule, and NH_3 has 4 atoms per molecule. Their rates of diffusion would be different due to their different molar masses (CH_4 = 16 g/mol, NH_3 = 17 g/mol). Send me the next one 📸