Directions For Questions Consider the following statements about the Nernst equation:(A) The Nernst equation relates the
(A) and(C) only correct as per chemistry principle.
Ref: NCERT Chemistry Class XII — Electrochemistry
#ion concentration
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For Ag₂S(s) 2Ag+(aq) + S²⁻(aq) , Ksp = 6.0 × 10⁻⁵⁰ . If [Ag+] = 1.0 × 10⁻¹⁵ M in a saturated solution, what is [S²⁻] ?
Ksp = [Ag+]²[S²⁻] = 6.0 × 10⁻⁵⁰ . Given [Ag+] = 1.0 × 10⁻¹⁵ , (1.0 × 10⁻¹⁵)² [S²⁻] = 6.0 × 10⁻⁵⁰ , 1.0 × 10⁻³⁰ [S²⁻] = 6.0 × 10⁻⁵⁰ , [S²⁻] = 6.0 × 10⁻²⁰ M .
Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Buffer Solutions and Solubility Product and Common Ion Effect
For AB(s) A+(aq) + B-(aq) , if Ksp = 4.0 × 10⁻⁸ , what is [B-] in mol/L?
Ksp = [A+][B-] = S² = 4.0 × 10⁻⁸ , S = sqrt4.0 × 10⁻⁸ = 2.0 × 10⁻⁴ , so [B-] = 2.0 × 10⁻⁴ M .
Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Buffer Solutions and Solubility Product and Common Ion Effect
For XY(s) X+(aq) + Y-(aq) , if Ksp = 9.0 × 10⁻⁶ , what is [X+] in mol/L?
Ksp = [X+][Y-] = S² = 9.0 × 10⁻⁶ , S = sqrt9.0 × 10⁻⁶ = 3.0 × 10⁻³ , so [X+] = 3.0 × 10⁻³ M .
Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Acid-Base Theories - Arrhenius Bronsted-Lowry Lewis and Salts Hydrolysis
Why may the concentration of certain ions be significantly higher inside a plant vacuole than in the cytoplasm?
The tonoplast is the membrane surrounding the vacuole. It facilitates the transport of several ions and other materials into the vacuole against their concentration gradients.
Ref: NCERT Class 11 Biology Chapter 8: Cell: The Unit of Life Eukaryotic Cell - Cell Wall and Cell Membrane - Fluid Mosaic Model
High cytosolic Ca2+ concentration eventually causes
inhibition of Ca2+ channels, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.
Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)
