I have no idea how to answer 3, 4, and 5. I have the answer key for them, but I

Question

I have no idea how to answer 3, 4, and 5. I have the answer key for them, but I don't know the *why*!!

b. HNO c. CH,COOH d. H2SO e. H2CO 2. Which one of the following is a weak acid? e. CH,COOH Which one of the following is a strong and soluble base? a. Ni(OH)2 b. Mg(OH) d. Cr(OH), e. Fe(OH)s 3 4. Which one of the following compounds is incorrectly identified as to type of com pound? Substance Type of Compound a. KOH b. HC10.4 c. HNO2 strong base strong acid weak acid insoluble base ,w weak acid NH3 e. H2SO3 5. Which response includes only soluble salts and no others? L BaCl2 II. PbSO4 III. Fe2S IV. Ca,(PO4)2 a. II, III, IVv b. I, IV, V I, III e. II, IV, V

Explanation / Answer

HClO4, HI, HBr, HCl are strong acids. They are completely ionisable aqueous solution to gives more number H^+ ions.

CH3COOH is weak acid. It is partialy ionisable in aqueous solution to give less number of ions.

e. CH3COOH

3. Alkali metal hydroxides are strong bases.They are completely ionisable to gives more OH^- ions.

c. RbOH

4. NH3 is soluble in water due to formation of intermolecular hydrogen bond with water.

   d. NH3   insoluble base

5 . All NO3^- salts are soluble in water.

   Cl^- salt of alkali metal, alkaline earth are soluble in water.

c. I,V

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