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Mdcat-past-papers - NUMS Quiz

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421. Enthalpy change of combustion is exothermic because:



422. The lattice energy is also called:



423. Energy change in a cyclic process is always equal to zero. This is the statement of:



424. The following equation represents which energy change? Mg²⁺(g) + O²⁻(g) → MgO(s)



425. At equilibrium, the concentration of reactants and product becomes:



426. Which one is not true about rate of reaction?



427. In reactions: Fe₂O₃ + CO → Fe + CO₂ H₂O + CO → H₂ + CO₂ Decrease in concentration of CO₂ will shift equilibrium:



428. When moles of reactants and products are equal, which factor affects equilibrium?



429. In a gaseous reaction, increasing pressure shifts equilibrium in the direction of:



430. The high pressure of 200 atm in Haber's process is used for:



431. Which factor helps equilibrium to be attained earlier?



432. To minimize leftover reactants in ammonia synthesis, use conditions:



433. A buffer solution is not formed by:



434. An acidic buffer consists of:



435. The pH of human blood is:



436. If solubility of PbS at 25°C is 4.0 × 10⁻²⁸, then ionic concentration is:



437. Which of the following is a balanced redox equation?



438. The breakdown of a substance with current is:



439. Reduction occurs at:



440. Zn rod acts as cathode when coupled with magnesium electrode. This is because the reduction potential of:



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