Reason (R): Graphite is a good conductor of electricity. Assertion (A): All non metals are insulators. Reason (R): Pure iron is very soft and stretches easily when hot. Assertion (A): Iron is the most widely used metal.But it is never used in its pure state. Reason: Al2O3 reacts with acid as well as base to form salt and water. Assertion: Al2O3, is an amphoteric oxide. Reason: Nitrogen has 5 valence electrons. Reason (R): Iron slowly reacts with oxygen and form iron oxide. Q.6.Assertion (A): Rusting of iron is a slow combustion Reason: Copper is more reactive than hydrogen. Assertion: Copper does not reacts with the H2SO4. Reason (R): They are electrovalent compounds and have strong force of attraction Assertion (A): Ionic compounds and solids are somewhat hard. Reason: Silver reacts with H2S gas to form Ag2S which is black in colour. Assertion: Silver becomes black in colour when exposed to atmosphere. ![]() Reason (R): A large amount of energy is required to break the strong inter-ionic Assertion (A): Ionic compounds have high melting and boiling points. Assertion: iron is found in the free state in nature. (d) The statement of the Assertion is false but the Reason is true. (c) Assertion is true but the Reason is false. ![]() (b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion. (a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion. You have to select the one that best describes the two statements. Read them carefully and answer the question on the basis of following options. ASSERTION AND REASON QUESTIONSĭIRECTION: Each of these questions contains an Assertion followed by Reason. (d) Salt solution contains ions which makes it conductive and allows the electricity to flow through it. (c) Salt solution has a high boiling point which allows the flow of current in the circuit without getting hot. (b) Salt solution has a low melting point which allows the current to flow through it. (a) Salt solution is covalent in nature and conducts electricity. How does the salt solution help the LED to glow? He replaces the distilled water with a salt solution and observes that the LED glows. The student notices that the LED does not glow. A student makes an electric circuit using an LED, a battery and connecting wires to test the conductivity of distilled water. Which of the following properties of aluminium are responsible for the same?Ģ5. Aluminium is used for making cooking utensils. ![]() The ability of metals to be drawn into thin wire is known asĢ4. Which of the following properties is not shown by Z?Ģ3. Reaction between X and Y forms compound Z. Which of the following are not ionic compounds? Which of the following is the correct arrangement of the given metals in ascending order of their reactivity? (d) Test the basicity using a red litmus paper. (c) Test the acidity using a blue litmus paper. (b) Measure the temperature change using a thermometer. (a) Evaporate the solution to get crystals.
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