1 |
the substance which increase the rate of reaction but remains unchanged at the end of the reaction is called. |
- A. Indicator
- B. Promoter
- C. Catalyst
- D. Activated complex
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2 |
The pH of human blood is |
- A. 7.0
- B. 7.4
- C. 4.0
- D. 6.5
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3 |
Almost forward reaction is complete when value of Kc is |
- A. very high
- B. Very small
- C. Neither large nor very small
- D. No correlation
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4 |
The unit of equilibrium constant K<sub>c</sub>for the reaction |
- A. dm<sup>+6</sup>mole<sup>-2</sup>
- B. mole<sup>2</sup>dm<sup>-6</sup>
- C. Mole dm<sup>-3</sup>
- D. Having no units
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5 |
Kw for water at 0 oc is 0.1 x 10<sup>-34</sup> and at 100 <sup>o</sup>C 7.5 x 10<sup>-14</sup>, How many times dissociation of water increase from 0 <sup>o</sup>Cto 100 <sup>o</sup>C |
- A. 7.5 times
- B. 50 times
- C. 75 times
- D. 100 times
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6 |
The pH of 10-3 mole dm-3 of an aqueous solution of H2SO4 is. |
- A. 3.0
- B. 2.7
- C. 2.0
- D. 1.5
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7 |
The pK<sub>a</sub>value of CH<sub>3</sub>COOH is 4.74 when we mix CH<sub>3</sub>COOH and CH<sub>3</sub>COONa in the ratio of 10:1, tehn the pH of the buffer is |
- A. 4.74
- B. 5.74
- C. 3.74
- D. 7.00
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8 |
When concentration of one product is removed at equilibrium stage, in which direction it moves to reestablish equilibrium. |
- A. Forward
- B. Reverse
- C. Neither forward nor reverse
- D. Equally move in both direction
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9 |
Which statement is correct about solubility product constant. |
- A. It is applicable at highly soluble substances.
- B. Value of Kap is independent of temperature
- C. It is used for homogeneous aquarium system
- D. It can be used to predict that precipitation will take place or not by combining two ions
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10 |
The number of moles of acid or base required by one dm<sup>3</sup>of buffer to alter its pH by one unit is called |
- A. Buffer efficiency
- B. Buffer capacity
- C. Buffer action
- D. None
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