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Class 10 · Science · Expert
→What is the correct difference between the symbols [aq] and [l] in a chemical equation?
Class 10 · Science · Expert
→A student calls the reaction \(2AgCl(s) \xrightarrow{\text{sunlight}} 2Ag(s)+Cl_2(g)\) a displacement reaction because chlorine is released. What is the best correction of the student's error?
Class 10 · Science · Expert
→Which of the following equations is a correct example of a precipitation reaction?
Class 10 · Science · Expert
→If heat is shown on the reactant side of a chemical equation and one compound breaks down to form two or more products, what is the correct classification of the reaction?
Class 10 · Science · Expert
→A student classified the reaction \(2AgCl \xrightarrow{\text{sunlight}} 2Ag + Cl_2\) as a displacement reaction. What is its correct classification?
Class 10 · Science · Expert
→Which statement about oxidation and reduction is correct in the given equation? \(2\mathrm{FeCl_3} + \mathrm{SnCl_2} \rightarrow 2\mathrm{FeCl_2} + \mathrm{SnCl_4}\)
Class 10 · Science · Medium
→Which chemical process do antioxidants slow down in food?
Class 10 · Science · Expert
→A student places a zinc strip in a blue copper sulphate solution and claims that no chemical reaction has occurred. Which observation would prove the student's conclusion wrong?
Class 10 · Science · Expert
→When an iron nail is placed in blue copper sulphate solution, the solution turns green and a reddish-brown coating forms on the nail. What type of reaction is this?
Class 10 · Science · Expert
→Which of the following equations represents a displacement reaction in which a more reactive metal displaces a less reactive metal from its aqueous salt solution?
Class 10 · Science · Medium
→Why does an oiled iron object rust less?
Class 10 · Science · Expert
→In galvanisation, the zinc coating mainly prevents iron from coming into contact with which of the following?
Class 10 · Science · Expert
→Which of the following is a redox reaction in which the oxidation number of one element increases and that of another element decreases?
Class 10 · Science · Hard
→In the thermite reaction Fe₂O₃ + 2Al → Al₂O₃ + 2Fe, which statement correctly identifies oxidation and reduction?
Class 10 · Science · Expert
→Why are oxidation and reduction considered together in a redox reaction?
Class 10 · Science · Expert
→What type of reaction is represented by \(2Pb(NO_3)_2 \xrightarrow{\Delta} 2PbO + 4NO_2 + O_2\)?
Class 10 · Science · Expert
→In the thermite reaction \(Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe\), which substance is oxidised and which is reduced?
Class 10 · Science · Expert
→When black copper(II) oxide, \(\mathrm{CuO}\), is heated with hydrogen gas, reddish-brown copper is formed. This change is an example of what?
Class 10 · Science · Easy
→Why is a precipitate shown by a downward arrow in an equation?
Class 10 · Science · Expert
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