12 வேதியியல் அலகு-4 D - தொகுதி தனிமங்கள்

The correct answer is "தனித்த எலக்ட்ரான்கள்" which translates to "individual electrons" in English. The question asks what ions are formed when compounds are dissolved in water. The options provided are "double electrons," "individual electrons," and "individual pair of electrons." However, the last option states that there are no ions formed, which is incorrect. Therefore, the correct answer is "individual electrons," indicating that compounds form individual ions when dissolved in water.

The correct answer is "தனித்த எலக்ட்ரான்" (Isolated electrons). This is because the passage mentions "பாரா காந்தத்தன்மை பண்பு ஏற்படக் காரணம்" (the property of paramagnetism) and provides two reasons for it - "ஜோடி எலக்ட்ரான்கள்" (bonded electrons) and "முழுமையாக நிரப்பப்பட்ட எலக்ட்ரான் உள்கூடுகள்" (completely filled electron shells). Therefore, the correct answer must be the opposite of these two reasons, which is "தனித்த எலக்ட்ரான்" (isolated electrons).

The correct answer is "d-dஇடபெயர்ச்சிக்கு ஆற்றலை உறிஞ்சுதல்". This is because it states that the reason for the formation of regional languages is the desire to preserve and promote cultural identity. It suggests that people have a sense of attachment and pride towards their language and want to ensure its survival and recognition.

The correct answer is d- தொகுதி தனிமங்கள். This answer is correct because it matches the given statement in the question, which states that "தொகுதி தனிமங்கள்" (District Forests) have a general characteristic of biodiversity. Therefore, option d is the correct answer as it directly corresponds to the statement provided in the question.

The correct answer is "d-d இடப்பெயர்ச்சி" (d-d transition). This refers to the absorption or emission of light by a transition metal ion due to the rearrangement of electrons within its d orbitals. In the case of Ti(H2O)63+, the d-d transition occurs when an electron in one of the d orbitals of the Ti3+ ion absorbs energy and jumps to a higher energy level. This transition results in the absorption of light in the visible region of the electromagnetic spectrum, giving rise to the characteristic color of the complex ion.

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The correct answer is "காப்பர் பைரைட்டுகள்" which means "Copper wires" in English. This is the correct answer because the question asks where copper is obtained from, and copper wires are made from copper.

AgBr is used in photography as a light-sensitive material. It is commonly used in black and white film and paper photography to capture and develop images. When exposed to light, AgBr undergoes a chemical reaction that forms a latent image, which can be developed to produce a visible image. Therefore, AgBr is the silver salt that is used in photography.

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The passage states that the given statements are all correct. It mentions that they apply to all universes, different dimensions, colored ions, and combined particles. Therefore, the correct answer is that all the given statements are correct.

This answer states that K2Cr2O7 reduces ferric sulfate to ferrous sulfate.

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The given options represent different expressions involving a variable 'n'. The expression that represents the maximum power of n is √n(n+2). This can be determined by analyzing the exponents of n in each option. In √n(n+2), the exponent of n is 1, which is the highest among all the options. Therefore, √n(n+2) is the expression that represents the maximum power of n.

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The element with the highest electronegativity value will have the maximum tendency to attract electrons towards itself, resulting in a high electronegativity. In this case, Os (Osmium) has the highest electronegativity value among the given elements, indicating that it has the maximum tendency to attract electrons and achieve a high oxidation state.

Na2ZnO2 is the correct answer because it is the compound formed when sodium reacts with zinc oxide (ZnO). The reaction between sodium and zinc oxide results in the formation of Na2ZnO2.

Mn2+ has the highest number of unpaired electrons among the given options. Unpaired electrons are those that are not paired with another electron, and they contribute to the overall magnetic properties of an atom or ion. In this case, Mn2+ has five unpaired electrons, while the other options have fewer unpaired electrons. Therefore, Mn2+ has the highest number of unpaired electrons, making it the correct answer.

The correct answer is Na2CdI4. This is because Na2CdI4 is the only compound listed that does not have any color. The other compounds, Na2CuCl4 and K4[Fe(CN)5], would have color due to the presence of transition metal ions (Cu and Fe) in their structures.

The correct answer is "அர்ஜன்டைட்டும், குப்ரைட்டும் ஆக்ஸைடுகள்" which means "Argon and Krypton are gases". This is the correct answer because the other options do not make sense or are not related to the given question. The question asks for the incorrect statement, and the incorrect statement is that Argon and Krypton are oxides.

The correct answer is "அணைவுச்சேர்மம் உருவாகும் தன்மை" which means "It promotes team building skills". This answer suggests that the use of Sodium Thiosulphate in photography helps in developing teamwork skills.

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When copper(II) ions react with cyanide ions in the presence of excess alkali, they form a complex compound called copper(II) cyanide. The formula for copper(II) cyanide is Cu(CN)2. However, when potassium cyanide (KCN) is added to copper(II) cyanide, it forms a different complex compound called potassium hexacyanocuprate(II). The formula for potassium hexacyanocuprate(II) is K2[Cu(CN)6]. Therefore, the correct answer is K2[Cu(CN)6]. The other options, Cu(CN)2, K[Cu(CN)2], and Cu2(CN)2 +(CN)2, are not the correct formulas for the compound formed in this reaction.

When copper ore is heated with carbon, it undergoes a process called smelting. During this process, copper sulfide (Cu2S) reacts with iron sulfide (FeS) to form iron silicate (FeSiO3). Therefore, FeSiO3 is the correct answer.

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All types of copper salts are blue in color. The given statement states that all types of copper salts are blue in color. Therefore, the statement is correct.