KCET2020ChemistrySolutions
Which of the following pair of solutions is isotonic?
Options
- A0.01 M BaCl ₂ and 0.015 M NaCl
- B0.001 M Al ₂ ( SO ₄ )₃ and 0.001 M BaCl ₂
- C0.001 M CaCl ₂ and 0.001 M Al ₂ ( SO ₄ )₃
- D0.01 M BaCl ₂ and 0.001 M CaCl ₂
Correct answer
A. 0.01 M BaCl ₂ and 0.015 M NaCl
Step-by-step solution
To solutions are isotonic, if their osmotic pressure are same. Here, 0.01 M BaCl ₂ and 0.015 M NaCl will have same value of osmotic pressure. We know, =C R T Here, R and T are constant and their value is same for both the solutions. =C_ effective R T If C_ effective of two solutions are equal then their osmotic pressures will also be equal. So, option (a) has equal value of C_ effective and hence, this pair will be isotonic.