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A reddish-brown metal “X”, when heated in air, gives a black compound “Y”, which when heated in presence of H₂ gas gives “X” back. “X” is refined by the process of electrolysis; this refined form of “X” is used in electrical wiring. Identify “X” and “Y”. Draw a well-labeled diagram to represent the process of refining “X”.
The reddish-brown metal “X” is copper (Cu). When copper is heated in air, it reacts with oxygen to form a black compound “Y”, which is copper(II) oxide (CuO). When CuO is heated in the presence of hydrogen gas (H₂), it gets reduced back to copper metal (Cu) and water is formed. CuO + H₂ → Cu + H₂O CRead more
The reddish-brown metal “X” is copper (Cu). When copper is heated in air, it reacts with oxygen to form a black compound “Y”, which is copper(II) oxide (CuO).
When CuO is heated in the presence of hydrogen gas (H₂), it gets reduced back to copper metal (Cu) and water is formed.
CuO + H₂ → Cu + H₂O
Copper is refined by electrolysis, and its pure form is widely used in electrical wiring due to its high electrical conductivity.
(b) Diagram to represent the process of refining of ‘X
See lessAn element ‘M’ with electronic configuration 2 8 3 combines separately with Cl-, SO4-2 anions. Write the chemical formulae of the compounds formed. Predict with the suitable reason the nature of the bond formed by element ‘M’ in general. How will the electrical conductivity of the compounds formed vary with respect to ‘M’?
The element M has the electronic configuration 2, 8, 3, indicating it is a metal with valency 3 (similar to aluminium). It combines with Cl⁻ to form MCl₃ and with SO₄²⁻ to form M₂(SO₄)₃. Since M loses electrons to nonmetals, the bond formed is ionic in nature. Ionic compounds consist of positive andRead more
The element M has the electronic configuration 2, 8, 3, indicating it is a metal with valency 3 (similar to aluminium). It combines with Cl⁻ to form MCl₃ and with SO₄²⁻ to form M₂(SO₄)₃. Since M loses electrons to nonmetals, the bond formed is ionic in nature. Ionic compounds consist of positive and negative ions held by strong electrostatic forces. These compounds conduct electricity only in molten or aqueous states, as free ions are available to carry electric current in those conditions.
See lessThe given reaction shows one of the processes to extract the metals like Iron and Manganese. MnO₂ (s) + Al(s) → Mn(l) + Al₂O₃ (s) + Heat a) Give reason why the above reaction is known as a thermite reaction. b) Identify the substance oxidised and reduced in the above reaction. c) Give a reason why Aluminium is preferably used in thermite reactions.
(a) The above reaction is known as a thermite reaction as the reaction is highly exothermic reaction. The metal (Mn/Fe) obtained will be in molten/ liquid state. (b) Substance oxidised - Al(s), Substance reduced – MnO2 (s) (c) Aluminium is preferably used in thermite reactions as it is placed aboveRead more
(a) The above reaction is known as a thermite reaction as the reaction is highly exothermic reaction. The metal (Mn/Fe) obtained will be in molten/ liquid state.
(b) Substance oxidised – Al(s), Substance reduced – MnO2 (s)
(c) Aluminium is preferably used in thermite reactions as it is placed above Fe and Mn in reactivity series of metals. Al is more reactive than Fe/ Mn.
See lessStudy the food chain given below and answer the questions that follow: a) If the amount of energy available at the third trophic level is 100 joules, then how much energy will be available at the producer level? Justify your answer. b) Is it possible to have 2 more trophic levels in this food chain just before the fourth trophic level? Justify your answer.
a) If 100 joules of energy are available at the third trophic level, then the producer level must have 10,000 joules of energy, as only 10% of energy is transferred at each step. Energy decreases through trophic levels due to losses in metabolic activities like respiration, movement, and heat. b) NoRead more
a) If 100 joules of energy are available at the third trophic level, then the producer level must have 10,000 joules of energy, as only 10% of energy is transferred at each step. Energy decreases through trophic levels due to losses in metabolic activities like respiration, movement, and heat.
b) No, it is not possible to add two more trophic levels before the fourth level, because the energy available would become too small to sustain additional organisms efficiently in the food chain.
See lessRefer to the image below and state how the magnetic field pattern indicates regions where the magnetic field is stronger outside the magnet? What happens to the magnetic field when the current in the circuit is reversed?
In the magnetic field pattern around the solenoid, the field lines are denser near the poles, showing that the magnetic field is stronger at these regions outside the solenoid. The direction of the field is from the north pole to the south pole outside the solenoid. When the electric current in theRead more
In the magnetic field pattern around the solenoid, the field lines are denser near the poles, showing that the magnetic field is stronger at these regions outside the solenoid. The direction of the field is from the north pole to the south pole outside the solenoid. When the electric current in the circuit is reversed, the direction of the magnetic field also reverses, interchanging the north and south poles of the solenoid while maintaining the same magnetic field strength.
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