Identify the conjugate base of HPO_4^2- A. h_2o B. h_2po_4 C. h_3po_4 D. po_4^3-
ID: 1021628 • Letter: I
Question
Identify the conjugate base of HPO_4^2- A. h_2o B. h_2po_4 C. h_3po_4 D. po_4^3- e. OH- Which of the following yields a buffer solution when equal volumes of the two solutions are mixed/a. 0.10 M NH_3 and 0.10 M HCI b. 0.10 M NH_4+ and 0.10 M KOH c. 0.20 M NH_3 and 0.10 M KOH d. 0.20 M NH_3 and 0.10 M HCI e. 0.20 M NH_4+ and 0.10 M HCI The reaction A + 2B rightarrow products has the rate law, rate = k[A] [B]^3. If the concentration of B is doubled while that of A is unchanged, by what factor will the rate of reaction increase? a. 2 b. 4 c. 6 d. 8 e. 9 Beta particles are identical to a. protons. b. helium atoms c. hydrogen atoms d. helium nuclei. e. electrons. Which one of the following changes would alter the rate constant (k) for the reaction 2A + B rightarrow products? a. increasing the concentration of A b. increasing the concentration of B c. increasing the temperature d. measuring k again after the reaction has run for a while Which two properties are more typical of molecular compounds than of ionic compounds? 1. They are gases or liquids at room temperature. 2. They have high melting points. 3. Solids do not conduct electricity, but liquids do. 4. Atoms share electrons. a. 1 and 4 b. 1 and 3 c. 2 and 3 d. 2 and 4 e. 3 and 4 Calculate E degree_cell for the following reaction: 2Fe^2+ (aq) + cd^2 + (aq) rightarrow 2Fe^3-(aq) + cd(s) a. -0.37 V b. 0.37 V c. -1.17 V d. 1.17 V e. None of these.Explanation / Answer
32) For an acid ion, add H+ to it to yield a conjugate base.
that is , H+ + HPO42-= H2PO4-
Correct answer is (b)
33) buffer is also a weak base and its conjugate acid
Here NH3 is weak base and NH4Cl is its conjugate acid
So, correct answer is (e)
34)
rate = k (A) (B)3
replace B with 2B. we get,
new rate = k(A) (2B)3
= 8 x k (A) (B)3
Thus, rate is increased by 8 times.
(35) beta particles are identicle to electrons
(36) rate concentration depends only on temperature. So, answer is option (c)
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