Question 20: Calculate the formula unit masses of ZnO, Na2O, if given atomic masses of Zn = 65 u, Na

Question 19: Why does the sky appear blue to human observers during daytime? Options : a) Blue light is absorbed

Question 18: The speed of a light ray changes from 3 × 10^8 m/s in air to 2 × 10^8

Question 17: Which of the following best describes kinetic energy? Options : a) The energy contained in chemical bonds b)

Question 16: Which type of organisms is always found at the beginning of a food chain? Options : a) Herbivore

Question 15: Which statement correctly describes the solubility of ethanol? Options : a) Slightly soluble in water b) Soluble only

Question 14: When hydrochloric acid reacts with sodium hydroxide, what is formed as a result of the neutralization reaction? Options

Question 13: What does a position-time graph with a straight line parallel to the time axis represent in the context

Question 12: What is the key reason for ultrasound to be used in cleaning delicate electronic components? Options : a)

Question 11: A botanist observes a dormant seed with no visible growth or movement. How can the botanist determine whether