Class 11
The primary difference between the modern periodic table and Mendeleev's periodic table is:- a)The two tables are the same except we know about more elements now.
- b)Mendeleev's table did not arrange the elements according to recurring trends in their properties.
- c)The elements in the modern table are arranged in order of increasing atomic weight.
- d)The elements in the modern table are arranged in order of increasing atomic number.
Correct answer is option 'D'. Can you explain this answer?
The primary difference between the modern periodic table and Mendeleev's periodic table is:
a)
The two tables are the same except we know about more elements now.
b)
Mendeleev's table did not arrange the elements according to recurring trends in their properties.
c)
The elements in the modern table are arranged in order of increasing atomic weight.
d)
The elements in the modern table are arranged in order of increasing atomic number.
Shaik Nusrath Sulthana N answered • 33 minutes agoAccording to lother mayer mandaleef concluded that physical and chemical properties of elements are periodic functions of their atomic weights but later mosleys experiment concluded that frequency directly proportional to atomic no so from that modern periodically table based on atomic no. this is primary difference
Eka aluminium predicted by Mendeleev is which element?- a)Germanium
- b)Magnesium
- c)Gallium
- d)Sodium
Correct answer is option 'C'. Can you explain this answer?
Eka aluminium predicted by Mendeleev is which element?
a)
Germanium
b)
Magnesium
c)
Gallium
d)
Sodium
Shaik Nusrath Sulthana N answered • 38 minutes agoEka aluminum is gallium, Eka silicon is germanium. their properties are aluminum exist as Al2o3 and gallium exist as Ga2o3, and also like silicon exists as sio2, germanium exists as Geo2, like carbon it exists as cH4, Geo4
Minerals in the plants are not lost when the leaf falls.?
Priyadhershini S answered • 2 hours agoMinerals are remobilised from older dying leaves to younger leaves. small amount of material exchange take place between xylem and phloem. hence minerals are not lost
Prashant Patil asked • 22 minutes agoSolve by cramer's rule 1/x 1/y=3/2, 1/y 1/z=5/6 , and 1/z 1/x=4/3?
Bighneswar Sahu asked • 38 minutes agoBank charges incidental expenses Rs50 and interest charges Rs 1200 journal entry?
Akash Bansal asked • 43 minutes agoPassage I The two major contributors of conformers of 1,2-dichloroethane are anti and gauche. At 32°C in gas phase, the measured dipole moment of 1,2-dichloroethane is 1.12 D. The dipole moment of a mixture of X and Y is given by the relationship 
Here, N = mole fraction of each kind of molecule. From bond moment measurement, it has been estimated that gauche conformer of 1,2-dichloroethane should have a dipole moment of about 3.2 D. Q.
What is true about percentage of gauche conformer?- a)There is only one gauche conformer in about 12%
- b)There is only one gauche conformer in about 64%
- c)There is racemic mixture, although inseparable, of gauche conformers, about 12%
- d)There is racemic mixture, although inseparable, of gauche conformers, about 64%
Correct answer is option 'C'. Can you explain this answer?
Passage I
The two major contributors of conformers of 1,2-dichloroethane are anti and gauche. At 32°C in gas phase, the measured dipole moment of 1,2-dichloroethane is 1.12 D. The dipole moment of a mixture of X and Y is given by the relationship
Here, N = mole fraction of each kind of molecule. From bond moment measurement, it has been estimated that gauche conformer of 1,2-dichloroethane should have a dipole moment of about 3.2 D.
Q.
What is true about percentage of gauche conformer?
What is true about percentage of gauche conformer?
a)
There is only one gauche conformer in about 12%
b)
There is only one gauche conformer in about 64%
c)
There is racemic mixture, although inseparable, of gauche conformers, about 12%
d)
There is racemic mixture, although inseparable, of gauche conformers, about 64%
Mirza Maris Ali asked • 2 hours agoThe compound shown below evolve hydrogen gas when refluxed with potassium metal, why?
- a)Loss of H2 introduces a new pi-bond that makes system aromatic
- b)Loss of H2 converts the given compound into an aromatic cation
- c)Loss of H2 converts the given compound into an aromatic anion
- d)Deprotonation of the above compound converts it into an aromatic anion
Correct answer is option 'D'. Can you explain this answer?
The compound shown below evolve hydrogen gas when refluxed with potassium metal, why?
a)
Loss of H2 introduces a new pi-bond that makes system aromatic
b)
Loss of H2 converts the given compound into an aromatic cation
c)
Loss of H2 converts the given compound into an aromatic anion
d)
Deprotonation of the above compound converts it into an aromatic anion
Yash Rathore asked • 4 hours agoThe correct statement(s) regarding the isomers of compound N-ethyl-N-methyl-l-propanamine is/are- a)A pair of enantiomers remain in dynamic equilibrium
- b)Addition of HCI results in the formation of enantiomeric hydrochloride salts
- c)Addition of a pure enantiomer of 2-methyl butanoic acid to the solution of amine results in formation of a pair of diastereomeric salts
- d)Its enantiomers can be separated by gas chromatography
Correct answer is option 'A,B,C'. Can you explain this answer?
The correct statement(s) regarding the isomers of compound N-ethyl-N-methyl-l-propanamine is/are
a)
A pair of enantiomers remain in dynamic equilibrium
b)
Addition of HCI results in the formation of enantiomeric hydrochloride salts
c)
Addition of a pure enantiomer of 2-methyl butanoic acid to the solution of amine results in formation of a pair of diastereomeric salts
d)
Its enantiomers can be separated by gas chromatography
Dhruv asked • 5 hours agoQ.Statement I : Butanone, upon protonation at oxygen atom result in a pair of stereoisomer.Statement II : Presence of lone pair of electrons at oxygen is responsible for protonation.- a)Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I
- b)Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I
- c)Statement I is correct but Statement II is incorrect
- d)Statement II is correct but Statement I is incorrect
Correct answer is option 'B'. Can you explain this answer?
Q.
Statement I : Butanone, upon protonation at oxygen atom result in a pair of stereoisomer.
Statement II : Presence of lone pair of electrons at oxygen is responsible for protonation.
a)
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I
b)
Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I
c)
Statement I is correct but Statement II is incorrect
d)
Statement II is correct but Statement I is incorrect
Alex Man asked • 5 hours agoWhat is turn over number of enzyme ?- a)The number of substrate molecules which
is converted to products in one minute
by an enzyme molecule - b)The number of product molecules which
is formed by one molecule of enzyme in
one minute - c)The number of molecules of the enzymes
which is essential for forming one product
molecule - d)None of the above
Correct answer is option 'A'. Can you explain this answer?
What is turn over number of enzyme ?
a)
The number of substrate molecules which
is converted to products in one minute
by an enzyme molecule
is converted to products in one minute
by an enzyme molecule
b)
The number of product molecules which
is formed by one molecule of enzyme in
one minute
is formed by one molecule of enzyme in
one minute
c)
The number of molecules of the enzymes
which is essential for forming one product
molecule
which is essential for forming one product
molecule
d)
None of the above
The percentage error in measurement of a, b, c and d are 1%, 3%, 2% and 1% respectively.
Devanshu Sahni asked • 5 hours agoStatement I : Boiling point of an alkene is slightly greater than that of its hydrogenated alkane.
Statement II : Alkenes have stronger van der Waals’ force of attraction than alkanes.- a)Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I
- b)Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I
- c)Statement I is correct but Statement II is incorrect
- d)Statement II is correct but Statement I is incorrect
Correct answer is option 'C'. Can you explain this answer?
Statement I : Boiling point of an alkene is slightly greater than that of its hydrogenated alkane.
Statement II : Alkenes have stronger van der Waals’ force of attraction than alkanes.
Statement II : Alkenes have stronger van der Waals’ force of attraction than alkanes.
a)
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I
b)
Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I
c)
Statement I is correct but Statement II is incorrect
d)
Statement II is correct but Statement I is incorrect
Ayush Gupta asked • 6 hours agoWhat is/are true about the following reaction?
- a)The major product is
- b)The reaction involve a cyclic oxonium ion intermediate.
- c)The product formed in A is chiral
- d)If the product is fu rth e r reacted with Br2 — CCI4, para brom ination occur predominantly
Correct answer is option 'A,B,C,D'. Can you explain this answer?
What is/are true about the following reaction?
a)
The major product is
b)
The reaction involve a cyclic oxonium ion intermediate.
c)
The product formed in A is chiral
d)
If the product is fu rth e r reacted with Br2 — CCI4, para brom ination occur predominantly
Akash Bansal asked • 6 hours agoSelect the correct statement(s) concerning conformers of ethane and hexachloroethane? - a)Both have the same number of important conformers
- b) Potential energy versus dihedral angle curves have similar nature in both cases
- c)Least stable conformer is hexachloroethane is most polar
- d)In potential energy versus dihedral angle diagram, there is greater difference between maxima and minima in ethane than in hexachloroethane
Correct answer is option 'A,B'. Can you explain this answer?
Select the correct statement(s) concerning conformers of ethane and hexachloroethane?
a)
Both have the same number of important conformers
b)
Potential energy versus dihedral angle curves have similar nature in both cases
c)
Least stable conformer is hexachloroethane is most polar
d)
In potential energy versus dihedral angle diagram, there is greater difference between maxima and minima in ethane than in hexachloroethane
Gaddam Dinesh asked • 7 hours agoDirection (Q. Nos. 20 - 22) This section contains 3 questions. When worked out will result in an integer from 0 to 9 (both inclusive).Q. How many different dichlorides, including stereoisomers by Wurtz coupling reaction with etheral solution of sodium, can give 1,4-dimethyl cyclohexane?
Correct answer is '7'. Can you explain this answer?
Direction (Q. Nos. 20 - 22) This section contains 3 questions. When worked out will result in an integer from 0 to 9 (both inclusive).
Q. How many different dichlorides, including stereoisomers by Wurtz coupling reaction with etheral solution of sodium, can give 1,4-dimethyl cyclohexane?
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