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Select the correct statement with respect to alkali metals.
- a)Melting points decrease with increasing atomic number.
- b)Potassium is lighter than sodium.
- c)Salts of Li to Cs impart characteristic color to an oxidizing flame. (of Bunsen burner).
- d)The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy.
Correct answer is option 'A,B,C,D'. Can you explain this answer?
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Select the correct statement with respect to alkali metals.a)Melting p...
Alkali Metals
Introduction: Alkali metals are a group of elements in the periodic table that includes lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). These elements are highly reactive and have only one valence electron, making them very effective reducing agents.
Melting Points: The melting points of alkali metals decrease with increasing atomic number. This is because the metallic bonding in these elements is primarily due to the delocalization of valence electrons, and the distance between the valence electrons and the positively charged nucleus increases as the atomic number increases. This weakens the metallic bonding and makes it easier for the atoms to break apart, lowering the melting point.
Potassium and Sodium: Potassium is lighter than sodium. This is because atomic mass is determined by the number of protons and neutrons in an atom's nucleus, and potassium has one more proton and neutron than sodium. However, the density of potassium is lower than that of sodium because potassium has a larger atomic radius, making it less dense.
Characteristic Flame Colors: Salts of Li to Cs impart characteristic color to an oxidizing flame (of Bunsen burner). When an alkali metal salt is heated in the flame of a Bunsen burner, the electrons in the metal atoms become excited and jump to higher energy levels. As they return to their ground state, they emit light of a specific wavelength, producing a characteristic color. Lithium produces a red color, sodium produces a yellow color, potassium produces a violet color, rubidium produces a red-violet color, and cesium produces a blue-violet color.
Solubility: The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy. Lattice energy is the energy required to separate the ions in a crystal lattice, and it is directly proportional to the charge of the ions and inversely proportional to the distance between them. LiF has a higher lattice energy than CsI because the charge on the ions is greater and the distance between them is smaller. Hydration energy is the energy released when an ion is surrounded by water molecules, and it is directly proportional to the charge density of the ion. CsI has a smaller hydration energy than LiF because the larger Cs+ ion has a lower charge density than the smaller Li+ ion.
Introduction: Alkali metals are a group of elements in the periodic table that includes lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). These elements are highly reactive and have only one valence electron, making them very effective reducing agents.
Melting Points: The melting points of alkali metals decrease with increasing atomic number. This is because the metallic bonding in these elements is primarily due to the delocalization of valence electrons, and the distance between the valence electrons and the positively charged nucleus increases as the atomic number increases. This weakens the metallic bonding and makes it easier for the atoms to break apart, lowering the melting point.
Potassium and Sodium: Potassium is lighter than sodium. This is because atomic mass is determined by the number of protons and neutrons in an atom's nucleus, and potassium has one more proton and neutron than sodium. However, the density of potassium is lower than that of sodium because potassium has a larger atomic radius, making it less dense.
Characteristic Flame Colors: Salts of Li to Cs impart characteristic color to an oxidizing flame (of Bunsen burner). When an alkali metal salt is heated in the flame of a Bunsen burner, the electrons in the metal atoms become excited and jump to higher energy levels. As they return to their ground state, they emit light of a specific wavelength, producing a characteristic color. Lithium produces a red color, sodium produces a yellow color, potassium produces a violet color, rubidium produces a red-violet color, and cesium produces a blue-violet color.
Solubility: The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy. Lattice energy is the energy required to separate the ions in a crystal lattice, and it is directly proportional to the charge of the ions and inversely proportional to the distance between them. LiF has a higher lattice energy than CsI because the charge on the ions is greater and the distance between them is smaller. Hydration energy is the energy released when an ion is surrounded by water molecules, and it is directly proportional to the charge density of the ion. CsI has a smaller hydration energy than LiF because the larger Cs+ ion has a lower charge density than the smaller Li+ ion.
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Select the correct statement with respect to alkali metals.a)Melting points decrease with increasing atomic number.b)Potassium is lighter than sodium.c)Salts of Li to Cs impart characteristic color to an oxidizing flame. (of Bunsen burner).d)The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy.Correct answer is option 'A,B,C,D'. Can you explain this answer?
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Select the correct statement with respect to alkali metals.a)Melting points decrease with increasing atomic number.b)Potassium is lighter than sodium.c)Salts of Li to Cs impart characteristic color to an oxidizing flame. (of Bunsen burner).d)The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy.Correct answer is option 'A,B,C,D'. Can you explain this answer? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Select the correct statement with respect to alkali metals.a)Melting points decrease with increasing atomic number.b)Potassium is lighter than sodium.c)Salts of Li to Cs impart characteristic color to an oxidizing flame. (of Bunsen burner).d)The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy.Correct answer is option 'A,B,C,D'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Select the correct statement with respect to alkali metals.a)Melting points decrease with increasing atomic number.b)Potassium is lighter than sodium.c)Salts of Li to Cs impart characteristic color to an oxidizing flame. (of Bunsen burner).d)The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy.Correct answer is option 'A,B,C,D'. Can you explain this answer?.
Select the correct statement with respect to alkali metals.a)Melting points decrease with increasing atomic number.b)Potassium is lighter than sodium.c)Salts of Li to Cs impart characteristic color to an oxidizing flame. (of Bunsen burner).d)The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy.Correct answer is option 'A,B,C,D'. Can you explain this answer? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Select the correct statement with respect to alkali metals.a)Melting points decrease with increasing atomic number.b)Potassium is lighter than sodium.c)Salts of Li to Cs impart characteristic color to an oxidizing flame. (of Bunsen burner).d)The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy.Correct answer is option 'A,B,C,D'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Select the correct statement with respect to alkali metals.a)Melting points decrease with increasing atomic number.b)Potassium is lighter than sodium.c)Salts of Li to Cs impart characteristic color to an oxidizing flame. (of Bunsen burner).d)The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy.Correct answer is option 'A,B,C,D'. Can you explain this answer?.
Solutions for Select the correct statement with respect to alkali metals.a)Melting points decrease with increasing atomic number.b)Potassium is lighter than sodium.c)Salts of Li to Cs impart characteristic color to an oxidizing flame. (of Bunsen burner).d)The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy.Correct answer is option 'A,B,C,D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Chemistry.
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Select the correct statement with respect to alkali metals.a)Melting points decrease with increasing atomic number.b)Potassium is lighter than sodium.c)Salts of Li to Cs impart characteristic color to an oxidizing flame. (of Bunsen burner).d)The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy.Correct answer is option 'A,B,C,D'. Can you explain this answer?, a detailed solution for Select the correct statement with respect to alkali metals.a)Melting points decrease with increasing atomic number.b)Potassium is lighter than sodium.c)Salts of Li to Cs impart characteristic color to an oxidizing flame. (of Bunsen burner).d)The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy.Correct answer is option 'A,B,C,D'. Can you explain this answer? has been provided alongside types of Select the correct statement with respect to alkali metals.a)Melting points decrease with increasing atomic number.b)Potassium is lighter than sodium.c)Salts of Li to Cs impart characteristic color to an oxidizing flame. (of Bunsen burner).d)The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy.Correct answer is option 'A,B,C,D'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Select the correct statement with respect to alkali metals.a)Melting points decrease with increasing atomic number.b)Potassium is lighter than sodium.c)Salts of Li to Cs impart characteristic color to an oxidizing flame. (of Bunsen burner).d)The low solubility of LiF is due to its high lattice energy whereas low solubility of CsI is due to smaller hydration energy.Correct answer is option 'A,B,C,D'. Can you explain this answer? tests, examples and also practice Chemistry tests.
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