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BASES AND SaLts, (A) Acidic oxide, (© Neutral oxide, ans. Option (B) is correct., , , , , (B) Basic oxide, , , , , , , , , , (P) Amphoteric oxics, , Nanese is, Oxides,, .! What will happen if we take dry Hc, _ aqueous solution of HC}>, (A) Reaction will occu; faster, — B) Reaction will nor occur, {© Reaction rate wil] be slow, (D) Reaction rate will remain the same, Option (B) is correct., | Explanation: HC) wi i, | produce H+ nig thus fraction saa, , BanO, + 4HC.— Mn, + C1, + 2H,0, , Aqueous, MnO, + HCI, No Reaction, Dry, , @ metal and Metal :, , 1 gas instead of, , , , , Read the following, from Q.1 to 0.5., , Frothing in Yamuna:, , The primary reason behind the formation of, the toxic foam is high Phosphate content in the, Wastewater because of detergents used in dyeing, industries, dhobi ghat Yamuna’s pollution level is, $0 bad that parts of it have been labelled ‘dead’ as, , there is no oxygen in it for aquatic life to survive., , and answer any four questions, [CBSE-QB 2021], , , , , , , , , , , , , , , , redict the pH value of the water of river Yamuna, _ if the reason for froth is high content of detergents, dissolved in it., t (B) 5-7, (D)7, n (A) is correct., Detergents are bases and bases, greater than 7., Ihich of the following statements is correct for the, with detergents dissolved in it?, low concentration of hydroxide ion (OH”)and, high concentration of hydronium ion (H;0*)., ) high concentration of hydroxide ion (OH”) and, ow concentration of hydronium ion (H;,0*)., sh concentration of hydroxide ion (OH) as, as hydronium ion (H;0*)., , , , , , , , 21, , (D) equal concentration of both hydroxide ion, (OH) and hydronium ion (H,0*)., Ans. Option (B) is correct., , Explanation: are bases. Bases, , Detergents, ionise to form OH” and thus there will be high, concentration of OH”., BOH —+ B* + OFF, Q. 3. The table provides the pH value of four solutions P,, Q, Rand $, , , , 11, Which of the following, correctly represents the, solutions in increasing order of their hydronium, lon concentration?, (A) P>Q>R>S, (C) S<Q<R<P, Ans. Option (C) is correct., Explanation: The pH value and hydrogen ion, concentration are inversely proportional. This, means if hydronium concentration increases,, the pH decreases, causing solution to become, more acidic. So hydronium ion concentration, will be of the order: S<Q<R<P, Q. 4. High content of phosphate ion in river Yamuna, may lead to:, (A) decreased level of dissolved oxygen and, increased growth of algae., decreased level of dissolved oxygen and no, effect of growth of algae., increased level of dissolved oxygen and, increased growth of algae., decreased level of dissolved oxygen and, decreased growth of algae., Ans. Option (A) is correct., Explanation: The phosphate ion promote the, “growthiof algae in water. So, the high level, weet ion in river Yamuna may lead, “to"déGreased level of oxygen and increased, growth of algae. This process is known as, eutrophication, al, Q.5.If a sample of water containing detergents is, provided to you, which of the following methods, will you adopt to neutralize it?, , (A) Treating the water with baking soda, , (B) Treating the water with vinegar, , (C) Treating the water with caustic soda, , (D) Treating the water with washing soda, Ans. Option (B) is correct., , Explanation: Ne ¢, , (B) P>S>Q>R, (D) S<P<Q<R, , (B), (S), , (D), , Neutralisation |