20 Questions MCQ Test Science Class 10 - Test: Acids, Bases & Salts
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Sodium carbonate is known as soda ash or washing soda Na2CO3 • 10H2O. It is the sodium salt of carbonic acid. It is white hygroscopic in nature and has an alkaline taste. It is used as a water softener.
Explanation: Introduction: The question asks why some alkali metal salts are colored, specifically Na2CrO4, KMnO4, and K2MnO4. It provides four options to choose from, and the correct answer is option B, which states that anions are colored ions. Explanation: To understand why these salts are colored, we need to look at the chromophores present in each compound. Chromophores are responsible for the absorption of specific wavelengths of light, resulting in the observed color. Na2CrO4 (yellow): - The chromophore in Na2CrO4 is the CrO42- anion. - The yellow color is due to the absorption of light in the blue region of the visible spectrum by the CrO42- anion. KMnO4 (pink): - The chromophore in KMnO4 is the MnO4- anion. - The pink color is due to the absorption of light in the green region of the visible spectrum by the MnO4- anion. K2MnO4 (green): - The chromophore in K2MnO4 is also the MnO4- anion. - The green color is due to the absorption of light in the red region of the visible spectrum by the MnO4- anion. Conclusion: From the above explanations, it is clear that the colored ions responsible for the observed colors in these alkali metal salts are the anions, specifically CrO42- and MnO4-. Therefore, option B, which states that anions are colored ions, is the correct answer.
Natural indicators are obtained from natural sources. All of the above examples are natural indicators. A solution of china rose turns green in a basic solution and bright pink or magenta in an acidic solution. Morning glories contain an anthocyanin called "heavenly blue anthocyanin" which changes from purplish red at pH 6.6 to blue at pH 7.7. Blueberries change from blue (around pH 2.8 — 3.2) to red in a strongly acidic solution.
Current is the rate of flow of charge. NaCl an ionic solid. An ionic solid consists of a lattice of Na+ and Cl ions in which these ions are fixed in their places. Solid NaCI does not contain any mobile charge carriers that can facilitate the flow of charge. But molten NaCI contains free mobile ions Na+ and Cl- ions which allow the passage of current.
pH above 7 confirms the compound to be alkaline in nature so it can be either sodium carbonate or sodium hydroxide as HCl and CH3COOH are acidic in nature. Sodium hydroxide is a strong base, so it has the highest pH of about 14, while sodium carbonate is a weak base to have pH 9.
Decay of teeth is because of the sweetening agents we eat as it increases the acidity inside the mouth, which can be prevented if the toothpaste used is alkaline or basic in nature. Baking soda or sodium hydrogen carbonate is also used to clean the teeth as it is alkaline in nature.
Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the emission of excess energy absorbed as radiation in the visible region.
When an alkali or alkaline earth metal (or its salt) is introduced in the flame, the metal's valence electrons absorb energy and are excited to the higher energy level. When excited electrons return to their ground state, they release the absorbed energy as visible light.
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