(a) Neon has two shells, both of which are completely filled with electrons (2 electrons in K shell and 8 electrons in L shell). (b) Magnesium has the electronic configuration 2, 8, 2. (c) Silicon has a total of three shells, with four electrons in its valence shell (2 electrons in K shell, 8 electrRead more
(a) Neon has two shells, both of which are completely filled with electrons (2 electrons in
K shell and 8 electrons in L shell).
(b) Magnesium has the electronic configuration 2, 8, 2.
(c) Silicon has a total of three shells, with four electrons in its valence shell (2 electrons
in K shell, 8 electrons in L shell and 4 electrons in M shell).
(d) Boron has a total of two shells, with three electrons in its valence shell (2 electrons in
K shell and 3 electrons in L shell).
(e) Carbon has twice as many electrons in its second shell as in its first shell (2 electrons
in K shell and 4 electrons in L shell).
(a) X would most likely be in the same group of the Periodic Table as magnesium (Mg). For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
(a) X would most likely be in the same group of the Periodic Table as magnesium (Mg).
(c) The atoms lose their electrons more easily. (On moving from left to right across the periods of the periodic table, the non-metallic character increases. Hence, the tendency to lose electrons decreases.) For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/scRead more
(c) The atoms lose their electrons more easily.
(On moving from left to right across the periods of the periodic table, the non-metallic
character increases. Hence, the tendency to lose electrons decreases.)
A soap molecule has two parts namely hydrophobic and hydrophilic. With the help of these, it attaches to the grease or dirt particle and forms a cluster called micelle. These micelles remain suspended as a colloid. To remove these micelles (entrapping the dirt), it is necessary to agitate clothes. FRead more
A soap molecule has two parts namely hydrophobic and hydrophilic. With the help of these,
it attaches to the grease or dirt particle and forms a cluster called micelle. These micelles
remain suspended as a colloid. To remove these micelles (entrapping the dirt), it is
necessary to agitate clothes.
Detergents are ammonium or sulphonate salts of long chain carboxylic acids. Unlike soap, they do not react with calcium and magnesium ions present in hard water to form scum. They give a good amount of lather irrespective of whether the water is hard or soft. This means that detergents can be used iRead more
Detergents are ammonium or sulphonate salts of long chain carboxylic acids. Unlike soap,
they do not react with calcium and magnesium ions present in hard water to form scum.
They give a good amount of lather irrespective of whether the water is hard or soft. This
means that detergents can be used in both soft and hard water. Therefore, it cannot be
used to check whether the water is hard or not.
Some substances such as alkaline potassium permanganate and acidified potassium dichromate are capable of adding oxygen to others. These are known as oxidising agents. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-4/
Some substances such as alkaline potassium permanganate and acidified potassium
dichromate are capable of adding oxygen to others. These are known as oxidising agents.
2HC= CH+50₂ → 4CO₂+2H₂O+Heat When ethyne is burnt in air, it gives a sooty flame. This is due to incomplete combustion caused by limited supply of air. However, if ethyne is burnt with oxygen, it gives a clean flame with temperature 3000°C because of complete combustion. This oxy-acetylene flame isRead more
2HC= CH+50₂ → 4CO₂+2H₂O+Heat
When ethyne is burnt in air, it gives a sooty flame. This is due to incomplete combustion
caused by limited supply of air. However, if ethyne is burnt with oxygen, it gives a clean
flame with temperature 3000°C because of complete combustion. This oxy-acetylene
flame is used for welding. It is not possible to attain such a high temperature without
mixing oxygen. This is the reason why a mixture of ethyne and air is not used.
The two features of carbon that give rise to a large number of compounds are as follows: (i) Catenation: It is the ability to form bonds with other atoms of carbon. (ii) Tetravalency: With the valency of four, carbon is capable of bonding with four other atoms. For more answers visit to website: httRead more
The two features of carbon that give rise to a large number of compounds are as follows:
(i) Catenation: It is the ability to form bonds with other atoms of carbon.
(ii) Tetravalency: With the valency of four, carbon is capable of bonding with four other
atoms.
A homologous series is a series of carbon compounds that have different numbers of carbon atoms but contain the same functional group. For example, methane, ethane, propane, butane, etc. are all part of the alkane homologous series. The general formula of this series is CnH2n+2. Methane CH₄ Ethane CRead more
A homologous series is a series of carbon compounds that have different numbers of
carbon atoms but contain the same functional group.
For example, methane, ethane, propane, butane, etc. are all part of the alkane
homologous series. The general formula of this series is CnH2n+2.
Methane CH₄
Ethane CH₃CH₃
Propane CH₃CH₂CH₃
Butane CH₃CH₂CH2CH₃
It can be noticed that there is a difference of -CH₂ unit between each successive
compound.
Which element has
(a) Neon has two shells, both of which are completely filled with electrons (2 electrons in K shell and 8 electrons in L shell). (b) Magnesium has the electronic configuration 2, 8, 2. (c) Silicon has a total of three shells, with four electrons in its valence shell (2 electrons in K shell, 8 electrRead more
(a) Neon has two shells, both of which are completely filled with electrons (2 electrons in
K shell and 8 electrons in L shell).
(b) Magnesium has the electronic configuration 2, 8, 2.
(c) Silicon has a total of three shells, with four electrons in its valence shell (2 electrons
in K shell, 8 electrons in L shell and 4 electrons in M shell).
(d) Boron has a total of two shells, with three electrons in its valence shell (2 electrons in
K shell and 3 electrons in L shell).
(e) Carbon has twice as many electrons in its second shell as in its first shell (2 electrons
in K shell and 4 electrons in L shell).
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Element X forms a chloride with the formula XCl2, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as
(a) X would most likely be in the same group of the Periodic Table as magnesium (Mg). For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
(a) X would most likely be in the same group of the Periodic Table as magnesium (Mg).
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic Table.
(c) The atoms lose their electrons more easily. (On moving from left to right across the periods of the periodic table, the non-metallic character increases. Hence, the tendency to lose electrons decreases.) For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/scRead more
(c) The atoms lose their electrons more easily.
(On moving from left to right across the periods of the periodic table, the non-metallic
character increases. Hence, the tendency to lose electrons decreases.)
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
People use a variety of methods to wash clothes. Usually after adding the soap, they beat the clothes on a stone, or beat it with a paddle, scrub with a brush or the mixture is agitated in a washing machine. Why is agitation necessary to get clean clothes?
A soap molecule has two parts namely hydrophobic and hydrophilic. With the help of these, it attaches to the grease or dirt particle and forms a cluster called micelle. These micelles remain suspended as a colloid. To remove these micelles (entrapping the dirt), it is necessary to agitate clothes. FRead more
A soap molecule has two parts namely hydrophobic and hydrophilic. With the help of these,
it attaches to the grease or dirt particle and forms a cluster called micelle. These micelles
remain suspended as a colloid. To remove these micelles (entrapping the dirt), it is
necessary to agitate clothes.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-4/
Would you be able to check if water is hard by using a detergent?
Detergents are ammonium or sulphonate salts of long chain carboxylic acids. Unlike soap, they do not react with calcium and magnesium ions present in hard water to form scum. They give a good amount of lather irrespective of whether the water is hard or soft. This means that detergents can be used iRead more
Detergents are ammonium or sulphonate salts of long chain carboxylic acids. Unlike soap,
they do not react with calcium and magnesium ions present in hard water to form scum.
They give a good amount of lather irrespective of whether the water is hard or soft. This
means that detergents can be used in both soft and hard water. Therefore, it cannot be
used to check whether the water is hard or not.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-4/
What are oxidising agents?
Some substances such as alkaline potassium permanganate and acidified potassium dichromate are capable of adding oxygen to others. These are known as oxidising agents. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-4/
Some substances such as alkaline potassium permanganate and acidified potassium
dichromate are capable of adding oxygen to others. These are known as oxidising agents.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-4/
A mixture of oxygen and ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is not used?
2HC= CH+50₂ → 4CO₂+2H₂O+Heat When ethyne is burnt in air, it gives a sooty flame. This is due to incomplete combustion caused by limited supply of air. However, if ethyne is burnt with oxygen, it gives a clean flame with temperature 3000°C because of complete combustion. This oxy-acetylene flame isRead more
2HC= CH+50₂ → 4CO₂+2H₂O+Heat
When ethyne is burnt in air, it gives a sooty flame. This is due to incomplete combustion
caused by limited supply of air. However, if ethyne is burnt with oxygen, it gives a clean
flame with temperature 3000°C because of complete combustion. This oxy-acetylene
flame is used for welding. It is not possible to attain such a high temperature without
mixing oxygen. This is the reason why a mixture of ethyne and air is not used.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-4/
Why is the conversion of ethanol to ethanoic acid an oxidation reaction?
CH₃CH₂OH → CH₃COOH For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-4/
CH₃CH₂OH → CH₃COOH
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-4/
What are the two properties of carbon which lead to the huge number of carbon compounds we see around us?
The two features of carbon that give rise to a large number of compounds are as follows: (i) Catenation: It is the ability to form bonds with other atoms of carbon. (ii) Tetravalency: With the valency of four, carbon is capable of bonding with four other atoms. For more answers visit to website: httRead more
The two features of carbon that give rise to a large number of compounds are as follows:
(i) Catenation: It is the ability to form bonds with other atoms of carbon.
(ii) Tetravalency: With the valency of four, carbon is capable of bonding with four other
atoms.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-4/
What is an homologous series? Explain with an example.
A homologous series is a series of carbon compounds that have different numbers of carbon atoms but contain the same functional group. For example, methane, ethane, propane, butane, etc. are all part of the alkane homologous series. The general formula of this series is CnH2n+2. Methane CH₄ Ethane CRead more
A homologous series is a series of carbon compounds that have different numbers of
carbon atoms but contain the same functional group.
For example, methane, ethane, propane, butane, etc. are all part of the alkane
homologous series. The general formula of this series is CnH2n+2.
Methane CH₄
Ethane CH₃CH₃
Propane CH₃CH₂CH₃
Butane CH₃CH₂CH2CH₃
It can be noticed that there is a difference of -CH₂ unit between each successive
compound.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-4/