Learn Chemistry with Prof. Kiran Patil

  स्टाफ सिलेक्शन कमिशन मार्फत 14582 जागांसाठी मेगा भरती शैक्षणिक पात्रता : ज्युनियर स्टॅटिस्टिकल ऑफिसर :  कोणत्याही शाखेतील पदवी व 12वीत गणितामध्ये किमान 60% गुण किंवा सांख्यिकीसह कोणत्याही विषयात पदवी. स्टॅटिस्टिकल इन्व्हेस्टीगेटर ग्रेड-II :  सांख्यिकीसह कोणत्याही विषयात पदवी. उर्वरित पदे :  कोणत्याही शाखेतील पदवी. Fee :  General/OBC: ₹100/-   [SC/ST/PWD/ExSM/महिला: फी नाही] Online अर्ज करण्याची शेवटची तारीख :  04 जुलै 2025 (11:00 PM) परीक्षा (Tier I) :  13 ते 30 ऑगस्ट 2025 परीक्षा (Tier II) :  डिसेंबर 2025 Apply Link : https://ssc.gov.in/

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 A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added to it. It is a mixture of a weak acid and its conjugate base, or a weak base and its conjugate acid. Buffer solutions are used in a variety of applications, including:  * Chemical reactions: Buffer solutions are used to maintain a constant pH during chemical reactions.  * Biological systems: Buffer solutions are used to maintain the pH of blood and other bodily fluids.  * Industrial processes: Buffer solutions are used in a variety of industrial processes, such as food production and wastewater treatment. Here are some examples of buffer solutions:  * A mixture of acetic acid and sodium acetate  * A mixture of ammonium chloride and ammonia  * A mixture of citric acid and sodium citrate The pH of a buffer solution can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]) where:  * pKa is the negative logarithm of the ...

 Dry cells are a type of battery commonly used in many portable electronic devices. While they have some advantages, they also have several disadvantages:  * Non-rechargeable: Dry cells are primary batteries, meaning they cannot be recharged once they are depleted. This leads to increased waste and the need for frequent replacements.  * Limited applications: Due to their non-rechargeable nature, dry cells are not suitable for devices that require a continuous power supply or high current demands.  * Lower energy density: Compared to some other battery types, dry cells have a lower energy density, meaning they store less energy for the same size and weight. This can result in shorter operating times for devices.  * Environmental concerns: Dry cells contain hazardous materials, such as heavy metals and chemicals, which can leach into the environment if they are not disposed of properly. This can cause soil and water contamination, posing risks to human health and ...

  The SN2 mechanism describes  a type of nucleophilic substitution reaction where a nucleophile replaces a leaving group in a one-step process. In the specific case of methyl bromide reacting with aqueous KOH, the nucleophile is the hydroxide ion (OH-) from KOH, and the leaving group is the bromide ion (Br-). Here's a step-by-step breakdown of the SN2 mechanism:  * Nucleophile Attack: The hydroxide ion (OH-) acts as a nucleophile, meaning it is attracted to positive charges. It approaches the methyl bromide molecule from the opposite side of the bromine atom. This is called "backside attack."  * Transition State: As the hydroxide ion approaches, it starts forming a bond with the carbon atom, while the bond between carbon and bromine starts breaking. This leads to a transition state where the carbon atom is partially bonded to both the hydroxide ion and the bromine atom. The transition state is unstable and high in energy.  * Leaving Group Departure: The carbon-b...