There are 50% chances that a girl may be born and 50% chances that a boy may be born. It can be explained as follows: Most human chromosomes have a maternal copy and a paternal copy. We have 22 such chromosomes. One pair of chromosomes called sex chromosomes is odd in not always being a perfect pairRead more
There are 50% chances that a girl may be born and 50% chances that a boy may be born. It can be explained as follows:
Most human chromosomes have a maternal copy and a paternal copy. We have 22 such chromosomes. One pair of chromosomes called sex chromosomes is odd in not always being a perfect pair. Women have a perfect pair of sex chromosomes, both called X. (XX)
But men have a mismatched pair of sex chromosomes in which one is normal sized – X chromosome while the other is a short one called Y chromosome. (XY)
A child receives one chromosome from mother which is essentially X chromosome. A child who inherits an X chromosome from her father will be a girl, and one who inherits a Y chromosome from him will be a boy.
Doctors recommend consuming iodised salt because iodine is a vital micronutrient required for the synthesis of thyroid hormones—thyroxine and triiodothyronine. These hormones control metabolism, body temperature, and overall growth. Iodine also supports brain development and nervous system functionsRead more
Doctors recommend consuming iodised salt because iodine is a vital micronutrient required for the synthesis of thyroid hormones—thyroxine and triiodothyronine. These hormones control metabolism, body temperature, and overall growth. Iodine also supports brain development and nervous system functions. A deficiency of iodine leads to goitre, fatigue, and mental dullness. Regular intake of iodised salt prevents such disorders and helps maintain a healthy thyroid gland, ensuring the body’s proper growth, development, and energy balance.
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
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.
(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.
What is the probability of a girl or a boy being born in a family? Justify your answer.
There are 50% chances that a girl may be born and 50% chances that a boy may be born. It can be explained as follows: Most human chromosomes have a maternal copy and a paternal copy. We have 22 such chromosomes. One pair of chromosomes called sex chromosomes is odd in not always being a perfect pairRead more
There are 50% chances that a girl may be born and 50% chances that a boy may be born. It can be explained as follows:
Most human chromosomes have a maternal copy and a paternal copy. We have 22 such chromosomes. One pair of chromosomes called sex chromosomes is odd in not always being a perfect pair. Women have a perfect pair of sex chromosomes, both called X. (XX)
But men have a mismatched pair of sex chromosomes in which one is normal sized – X chromosome while the other is a short one called Y chromosome. (XY)
A child receives one chromosome from mother which is essentially X chromosome. A child who inherits an X chromosome from her father will be a girl, and one who inherits a Y chromosome from him will be a boy.
See lessWe are advised to take iodised salt in our diet by doctors. Justify it’s importance in our body.
Doctors recommend consuming iodised salt because iodine is a vital micronutrient required for the synthesis of thyroid hormones—thyroxine and triiodothyronine. These hormones control metabolism, body temperature, and overall growth. Iodine also supports brain development and nervous system functionsRead more
Doctors recommend consuming iodised salt because iodine is a vital micronutrient required for the synthesis of thyroid hormones—thyroxine and triiodothyronine. These hormones control metabolism, body temperature, and overall growth. Iodine also supports brain development and nervous system functions. A deficiency of iodine leads to goitre, fatigue, and mental dullness. Regular intake of iodised salt prevents such disorders and helps maintain a healthy thyroid gland, ensuring the body’s proper growth, development, and energy balance.
See lessA 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 less