Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: H2Te is more acidic than H2S.
Reason R: Bond dissociation enthalpy of H2Te is lower than H2S.
In light of the above statements, choose the most appropriate from the options given below:
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: H2Te is more acidic than H2S.
Reason R: Bond dissociation enthalpy of H2Te is lower than H2S.
In light of the above statements, choose the most appropriate from the options given below:
- A is true but R is false.
- A is false but R is true.
- Both A and R are true but R is NOT the correct explanation of A.
- Both A and R are true and R is the correct explanation of A.
The Correct Option is D
Solution and Explanation
Understanding Assertion A: The acidity of hydrogen compounds such as H2S and H2Te can be compared based on the stability of the conjugate base formed after deprotonation. H2Te has a larger atomic size and weaker H–Te bonds compared to H–S, which leads to easier ionization of H2Te and thus higher acidity.
Understanding Reason R: The bond dissociation enthalpy is a measure of the strength of the bond between hydrogen and the other element (S or Te). Since H–Te bonds are weaker than H–S bonds, H2Te dissociates more easily, supporting the assertion that H2Te is more acidic than H2S.
Therefore, the correct interpretation of both statements shows that both Assertion A and Reason R are true, and R indeed provides the correct explanation for A.
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Concepts Used:
Chemical Coordination and Integration
The chemical coordination and integration of all physiological functions in the animal body are jointly synchronized by the neural and endocrine systems. The control and coordination of body functions are executed by the endocrine glands. They are ductless glands that secrete severel hormones to control and coordinate body functions.
Human Endocrine System:
The human body has several endocrine glands located in different parts. They cover the pituitary gland, thymus, thyroid gland, pineal gland, parathyroid, pancreas (dual gland), adrenal gland, and gonads (testes and ovaries). The liver, kidney, heart, and gastrointestinal tract also produce hormones in small traces to harmonize the functioning of these organs.
The Hypothalamus comprises groups of secretory cells called nuclei which secrets various hormones. These hormones released by the hypothalamus are important in regulating the synthesis and secretion of pituitary hormones.
Functions of Endocrine Glands:
- Pituitary Gland
- Pineal Gland
- Thyroid Gland
- Parathyroid Gland
- Thymus
- Adrenal Gland
- Pancreas
- Testes
- Ovary
- Hormones of Kidney, Heart, and Gastrointestinal Tract