8) Which term includes all others in the list? A) monosaccharide B) disaccharide

Question

8) Which term includes all others in the list? A) monosaccharide B) disaccharide C) starch carbohydrate polysaccharide 9) Which of the following statements is true about buffer solutions? A) They resist change in pH when bases are added to them but not when acids are added to them. B) They resist change in pH when acids are added to them but not when bases are added to them. C) They maintain a constant pH of exactly 7 in all living cells and biological fluids. D) They resist change in pH when either açids or bases are added to them. E) None of the above 10. Which of the following solutions has the greatest concentration of hydroxide ions [OH A) lemon juice at pH 2 B) vinegar at pH 3 C) tomato juice at pH 4 D) urine at pH 6 seawater at pH 8 11). What gives rise to the cohesiveness of water molecules? A) hydrophobic interactions B) nonpolar covalent bonds ionic bonds )-hydrogen bonds E) both A and C

Explanation / Answer

Ans8. E) polysaccharide. It is a carbohydrate contains a no. of sugar molecules bonded together. All other options will come uder it.

Ans9. D) They resist change in pH when either acids or bases is added to them.  A buffer solution is an aqueous solution containing a weak acid and its conjugate base or vice-versa. A buffer solution's pH changes very little when a small amount of strong acid or strong base is added to it.

Ans10. E) seawater at pH 8. It has pH more than 7 so it is more basic.

Ans11. D) hydrogen bonds. In cohesion the hydrogen bonds together to create surface tension on water.

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