Forwarded from SARTHAK TIWARI
What were the criteria used by Mendeleev in
creating his periodic table? (NCERT)
7. InMendeleev’speriodictable,theelementswere
arranged in the increasing order of their atomic
masses. However, cobalt with atomic mass of
58.93 amu was placed before nickel having an
atomic mass of 58.71 amu. Give reason for the same.
(NCERT Exemplar)
8. Write the formulae of chlorides of Eka-silicon
andEka-aluminium,theelementspredictedby
Mendeleev.
9. Write two main characteristics of Mendeleev’s
periodictableandwritenameofelementsofsecond
period.
10. How it can be proved that the basic structure of the
‘modern periodic table’ is based on the electronic
configuration of atoms of different elements?
(CBSE 2019)
11. ‘Hydrogen occupies a unique position in modern
periodic table’. Justify the statement.(NCERTExemplar)
12. (i) Listanytwodistinguishingfeaturesbetween
Mendeleev’s periodic table andthe modern
periodic table.
(ii) With the helpof an example, explain
Dobereiner’s Triads.
(iii) State modern periodic law. (CBSE 2020)
13. Write the formula of the product formed when the
element A (atomic number 19) combines with the
elementB (atomic number 17). Draw its electronic
dot structure. What is the nature of the bond
formed? (NCERT Exemplar)
14. Comparethe radii of two speciesXandY.Give
reasons for youranswer.
(a)Xhas 12 protons and 12 electrons,(b)Yhas 12
protonsand10electrons (NCERT Exemplar)
15. Arrangethefollowingelementsinincreasingorderof
their atomic radii.
(i) Li, Be, F and N (ii) Cl, At, Br and I
(NCERT Exemplar)
creating his periodic table? (NCERT)
7. InMendeleev’speriodictable,theelementswere
arranged in the increasing order of their atomic
masses. However, cobalt with atomic mass of
58.93 amu was placed before nickel having an
atomic mass of 58.71 amu. Give reason for the same.
(NCERT Exemplar)
8. Write the formulae of chlorides of Eka-silicon
andEka-aluminium,theelementspredictedby
Mendeleev.
9. Write two main characteristics of Mendeleev’s
periodictableandwritenameofelementsofsecond
period.
10. How it can be proved that the basic structure of the
‘modern periodic table’ is based on the electronic
configuration of atoms of different elements?
(CBSE 2019)
11. ‘Hydrogen occupies a unique position in modern
periodic table’. Justify the statement.(NCERTExemplar)
12. (i) Listanytwodistinguishingfeaturesbetween
Mendeleev’s periodic table andthe modern
periodic table.
(ii) With the helpof an example, explain
Dobereiner’s Triads.
(iii) State modern periodic law. (CBSE 2020)
13. Write the formula of the product formed when the
element A (atomic number 19) combines with the
elementB (atomic number 17). Draw its electronic
dot structure. What is the nature of the bond
formed? (NCERT Exemplar)
14. Comparethe radii of two speciesXandY.Give
reasons for youranswer.
(a)Xhas 12 protons and 12 electrons,(b)Yhas 12
protonsand10electrons (NCERT Exemplar)
15. Arrangethefollowingelementsinincreasingorderof
their atomic radii.
(i) Li, Be, F and N (ii) Cl, At, Br and I
(NCERT Exemplar)
Forwarded from Kumar Bhaiya Official
Case Study Based Questions [4 Marks] CBSE 2015,18,??
1. Read the following and answer the following questions.
The two characteristic features in carbon are tetravalency and catenation, which are put together
give rise to a large number of compounds. Many have the same non-carbon atom or group
of atoms attached to different carbon chains. Carbon compounds, except for oxides of carbon,
carbonate and hydrogen carbonate salts study under organic chemistry.
The carbon compounds which contain carbon and hydrogen are called hydrocarbons. Among
these, the saturated hydrocarbons are called alkanes. The unsaturated hydrocarbons containing
one or more double bonds are called alkenes. Those containing one or more triple bonds are
called alkynes.
(a) When a carbon atom shares electrons with the neighbouring carbon atoms, it forms a
straight chain or a branched chain or a closed chains of carbon atoms, name such property
of carbon.
Ans. Catenation
(b) Define the property of carbon mentioned in question (a).
Ans. The property of carbon atoms to link with other carbon atoms of the atoms of other elements
with single, double or triple envalent bonds, so as to form a large number of compounds
is called catenation.
(c) Give reasons for the following observation:
The element carbon forms a very large number of compounds.
Ans. (i) Carbon has the unique ability to form bonds with other carbon atoms, so as to form
long straight chains, branched chains and closed rings, giving rise to a large number
of molecules.
(ii) Carbon atom has four valence electrons, therefore, it can bind itself with four more
carbon atoms with single covalent bonds, or with different atoms of monovalent
elements.
1. Read the following and answer the following questions.
The two characteristic features in carbon are tetravalency and catenation, which are put together
give rise to a large number of compounds. Many have the same non-carbon atom or group
of atoms attached to different carbon chains. Carbon compounds, except for oxides of carbon,
carbonate and hydrogen carbonate salts study under organic chemistry.
The carbon compounds which contain carbon and hydrogen are called hydrocarbons. Among
these, the saturated hydrocarbons are called alkanes. The unsaturated hydrocarbons containing
one or more double bonds are called alkenes. Those containing one or more triple bonds are
called alkynes.
(a) When a carbon atom shares electrons with the neighbouring carbon atoms, it forms a
straight chain or a branched chain or a closed chains of carbon atoms, name such property
of carbon.
Ans. Catenation
(b) Define the property of carbon mentioned in question (a).
Ans. The property of carbon atoms to link with other carbon atoms of the atoms of other elements
with single, double or triple envalent bonds, so as to form a large number of compounds
is called catenation.
(c) Give reasons for the following observation:
The element carbon forms a very large number of compounds.
Ans. (i) Carbon has the unique ability to form bonds with other carbon atoms, so as to form
long straight chains, branched chains and closed rings, giving rise to a large number
of molecules.
(ii) Carbon atom has four valence electrons, therefore, it can bind itself with four more
carbon atoms with single covalent bonds, or with different atoms of monovalent
elements.
Forwarded from Kumar Bhaiya Official
CBSE 10th Important Questions
Q.List five points of differences between Saturated and unsaturated compounds(5)
Does Tungsten has High Resistivity or Low Resistivity? Why? Mention the reason also.
What are alloys mention three alloys {material bhi likha Jisse alloy bna}?
(no cheating👀)
Q. (a) Explain the nature of Colavent bond using the bond formation in C2H5Br ( Bromo ethane ) !
(b) What is a functional group? ( No need of examples, simply tell the basic definition) ! (2)
Q. What was the first earlier attempt of classification of elements ? Why this served only limited purpose ? Give atleast 2 reasons! (2) ...... (IMP)!
State the factors that affects the resistance of a conductor . Write the mathematical expression also.
Q. (a) An element X (2,8,2) combine separately with (NO3)- and (SO4)²- radicles. Write the formula of two compounds formed.
(b) State the place of metalloids in the periodic table.
(c) Suggest two methods for contraption in human beings
An element has atomic number 19 .where would you expect this element in periodic table ? And why ?
(z=16) is the element of group V of the periodic table.which of the following is the atomic number of the next element in same group?
What is atomic number?
What happens when a current carrying wire is placed in magnetic field?
Who proposed that magnetic field is present in a current carrying wire?
Comment on effect caused on environment due to kulhads
.
What happens when a current carrying wire is placed in a magnetic field perpendicular to the field
Why flow of energy is unidirectional?
Rajkumar said that - the magnetic field lines are "open" and they start at North pole of a magnet and end at south pole
Is he correct? If no , correct the sentence
The charge is moving along the direction of magnetic field.then force acting on it is?
What happens if we use a fuse made up of same wire which is used to make the electric circuit
What happens if the house hold electric appliances are connected in series
What were the limitations of dobereiner's triads?
What were the drawbacks of Newland's law of octaves?
What were the merits of mendeleeve period table?
An electric iron rated 1100 W at 220 V calculate effective resistance
Would you place the two isotopes of chlorine, Cl−35 and Cl−37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
Draw all possible isomer structures of pentane
Why will each gamete contain only one gene set?
Why do magnetic lines don't intersect?
Attempt for only 2 marks.
Name and differentiate between the two types of cell division.
What provides nutrition to sperm?
Name the common passage for urine and sperm
Q.List five points of differences between Saturated and unsaturated compounds(5)
Does Tungsten has High Resistivity or Low Resistivity? Why? Mention the reason also.
What are alloys mention three alloys {material bhi likha Jisse alloy bna}?
(no cheating👀)
Q. (a) Explain the nature of Colavent bond using the bond formation in C2H5Br ( Bromo ethane ) !
(b) What is a functional group? ( No need of examples, simply tell the basic definition) ! (2)
Q. What was the first earlier attempt of classification of elements ? Why this served only limited purpose ? Give atleast 2 reasons! (2) ...... (IMP)!
State the factors that affects the resistance of a conductor . Write the mathematical expression also.
Q. (a) An element X (2,8,2) combine separately with (NO3)- and (SO4)²- radicles. Write the formula of two compounds formed.
(b) State the place of metalloids in the periodic table.
(c) Suggest two methods for contraption in human beings
An element has atomic number 19 .where would you expect this element in periodic table ? And why ?
(z=16) is the element of group V of the periodic table.which of the following is the atomic number of the next element in same group?
What is atomic number?
What happens when a current carrying wire is placed in magnetic field?
Who proposed that magnetic field is present in a current carrying wire?
Comment on effect caused on environment due to kulhads
.
What happens when a current carrying wire is placed in a magnetic field perpendicular to the field
Why flow of energy is unidirectional?
Rajkumar said that - the magnetic field lines are "open" and they start at North pole of a magnet and end at south pole
Is he correct? If no , correct the sentence
The charge is moving along the direction of magnetic field.then force acting on it is?
What happens if we use a fuse made up of same wire which is used to make the electric circuit
What happens if the house hold electric appliances are connected in series
What were the limitations of dobereiner's triads?
What were the drawbacks of Newland's law of octaves?
What were the merits of mendeleeve period table?
An electric iron rated 1100 W at 220 V calculate effective resistance
Would you place the two isotopes of chlorine, Cl−35 and Cl−37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
Draw all possible isomer structures of pentane
Why will each gamete contain only one gene set?
Why do magnetic lines don't intersect?
Attempt for only 2 marks.
Name and differentiate between the two types of cell division.
What provides nutrition to sperm?
Name the common passage for urine and sperm
👍3
Hi everyone
A very warm good morning
Hope you all are doing amazing 😇
We are coming back soon with AST examination 😄😄
A very warm good morning
Hope you all are doing amazing 😇
We are coming back soon with AST examination 😄😄
👍2
विजेतव्या लङ्का चरणतरणीयो जलनिधिः
विपक्षः पौलस्त्यो रणभुवि सहायाश्च कपयः।
तथाप्येको रामः सकलमवधीद्राक्षसकुलं
क्रियासिद्धिः सत्त्वे भवति महतां नोपकरणे॥
🌱🌿🍂
विपक्षः पौलस्त्यो रणभुवि सहायाश्च कपयः।
तथाप्येको रामः सकलमवधीद्राक्षसकुलं
क्रियासिद्धिः सत्त्वे भवति महतां नोपकरणे॥
🌱🌿🍂
Dear student,
As CBSE examinations are concluded you are requested to fill up the data for the purpose of information.
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Team TFPIT
As CBSE examinations are concluded you are requested to fill up the data for the purpose of information.
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Team TFPIT
Dear student,
As CBSE examinations results are to be declared in 2 days you are requested to fill up the data for the purpose of information. Toppers will be rewarded
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Team TFPIT
As CBSE examinations results are to be declared in 2 days you are requested to fill up the data for the purpose of information. Toppers will be rewarded
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Team TFPIT
Dear student,
As CBSE examinations results are to be declared you are requested to fill up the data for the purpose of information. Toppers will be rewarded
Link:_ https://docs.google.com/forms/d/e/1FAIpQLSf2tyjPUcvLQKU32imJZJMH4Ol3Pv1GovlPHQ9oN7_MpqrCCw/viewform
Team TFPIT
As CBSE examinations results are to be declared you are requested to fill up the data for the purpose of information. Toppers will be rewarded
Link:_ https://docs.google.com/forms/d/e/1FAIpQLSf2tyjPUcvLQKU32imJZJMH4Ol3Pv1GovlPHQ9oN7_MpqrCCw/viewform
Team TFPIT
Congratulations to all of you!!!! Please send your data to us as soon as possible those who haven't and get rewarded.
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https://docs.google.com/forms/d/e/1FAIpQLSf2tyjPUcvLQKU32imJZJMH4Ol3Pv1GovlPHQ9oN7_MpqrCCw/viewform
❤4
Hello family,
I hope you all are doing well, it's Been 11 months now I haven't appeared on yt or any where else.
Jayda emotional baatein nhi krunga wo hum live krenge.
The good news hai after so much downs and fight I'm coming back with full energy with new ideas and content.
Jaldi milte hai ...jo nye bhai behan sabko fir se welcome.
Miltey hai jaldi.
#staytuned
Regards
Kumar bhaiya 😊
I hope you all are doing well, it's Been 11 months now I haven't appeared on yt or any where else.
Jayda emotional baatein nhi krunga wo hum live krenge.
The good news hai after so much downs and fight I'm coming back with full energy with new ideas and content.
Jaldi milte hai ...jo nye bhai behan sabko fir se welcome.
Miltey hai jaldi.
#staytuned
Regards
Kumar bhaiya 😊
👍1