MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryIonic equilibriumPrevious Year Questions
Which of the following is correct? (CPMT 2008)
A.The pH of 1L solution containing 0.49 g of✓ Correct
B.The conjugate base of
C.BF3 is a Lewis’s base.
D.Phenolphthalein is colourless in basic medium.
Explanation
In option A, we have- 2 0.005 [H m ] 2 olar concen 0.005 0.01 (0.0 tration 0.49 / 9 H 1) 8 p log pH x M In option B, H2S and HS– are conjugate acid base pairs. In option C, 3 BF is sp2 hybridized with trigonal planar structure. The central atom boron present in it has incomplete octet due to shortage of electrons. Therefore, it can accept electrons from any Lewis’s base and can act as Lewis’s acid. In option D, it turns colorless in acidic solutions and pink in basic solutions
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