dhoran 8 vigyan ch 7 swadhyaypothi, std science ch 7 swadhyay, ધોરણ 8 વિજ્ઞાન પાઠ 7 સ્વ અધ્યયનપોથી,Gujarat board

Out of 100 students, 15 passed in English, 12 passed in Mathmatics, 8 in Science, 6 in English and Mathematics, 7 in Mathematics and Science , 4 in English and Science, 4 in all the three. Find how many passed (i) in English and Mathematics but not in Science. (ii) in Mathematics and Science but not in English. (iii) in Mathematics only. (iv) in more than one subject only.

If 7xx7 grid is cut from an 8xx8 chess board, such that the corners are back in how many ways we an put 2 identical coins,one on a black square and one on a white square,such that they are not placed in the same row or same column

Fifty books be longing to different subjects viz. History (8), Geography (7), Literature (13), Psychology (8), Science (14) are placed on a shelf. They are arranged in an alphabetical order subject to condition that no two books of same subject are placed together so long as the books of other subjects are available, unless otherwise mentioned all counting is done from left. What is the position of History book which comes immediately after science book ?

Fifty books be longing to different subjects viz. History (8), Geography (7), Literature (13), Psychology (8), Science (14) are placed on a shelf. They are arranged in an alphabetical order subject to condition that no two books of same subject are placed together so long as the books of other subjects are available, unless otherwise mentioned all counting is done from left. How many pairs (Science and Literature book respectively) are placed together on the shelf?

Fifty books be longing to different subjects viz. History (8), Geography (7), Literature (13), Psychology (8), Science (14) are placed on a shelf. They are arranged in an alphabetical order subject to condition that no two books of same subject are placed together so long as the books of other subjects are available, unless otherwise mentioned all counting is done from left. How many pairs (science and Geography book respectively) are placed together on the shelf?

Out of 100 students who appeared for the SSC examination from a school 15 students in English ; 12 students in Mathematics; 8 students in Sience 7 studens in Mathematics and Science; 4 students in English and Science 6 students in English and Mathematics; 4 students in all the three subjects could get First calss marks. How many of them have got First class marks.(ii) only in Science (i) only in Mathmatics

Comprehension # 3 Branched - chain alkanes are named according to the following rules. (1) Longest chain Rule - Locate the longest continuous chain of carbon atoms. This chain determines the parent name of the alkane. (2) Lowest set of locants -The longest continuous chain are numbered by arabic numerals 1,2,3,4....from one end of chain to the other, in such a manner that carbon atom carrying first substituent gets the lowest number. (3) Name of the branched chain alkane - The substituent name and the parent alkane are joined in one word and there is a hyphen between the number and the substituent name. (4) Alphabetical order of the side chains- When two or more substituent group should be listed alphabetically. (5) Numbering of different alkyl groups at equivalent positions - If two different alkyl groups are present at equivalent positions the numbering of the parent chain is done in such a way that alkyl group which comes first in the alphabetical order gets the lower number. (6) Naming of same alkyl groups at different positions - When two or more substituents are identical, indicate this by the use of prefixes di, tri, tetra and soon. Commas are used to separate number from each other. (7) Rule of larger number of subsitiuents - If a compound has two or more chains of the same length, the parent hydrocarbon is the chain with the greater number of substituents. (8) Numbering the complex substituent - Name such as iso-propyl, sec-butyl and tert-butyl are acceptable substituent name is the IUPAC system of nomenclature but systematic name are preferable. Systematic substituent names are obtained by numbering the substituent starting at the carbon that is attached to the parent hydrocarbon. This means that the carbon that is attached to the parent hydrocarbon is always the number-1 carbon of the substituent. In following compound CH_(3)-CH_(2)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-underset(CH_(3))underset(|)(CH)-overset(CH_(3))overset(|)(CH)-CH_(2)-CH_(3) The correct IUPAC name of following compound is - CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-CH_(2)-underset(CH_(3)-CH-CH_(3))underset(|)underset(CH_(3)-C-CH_(3))underset(|)(CH)-CH_(2)-CH_(2)-CH_(2)-CH_(3)

Comprehension # 3 Branched - chain alkanes are named according to the following rules. (1) Longest chain Rule - Locate the longest continuous chain of carbon atoms. This chain determines the parent name of the alkane. (2) Lowest set of locants -The longest continuous chain are numbered by arabic numerals 1,2,3,4....from one end of chain to the other, in such a manner that carbon atom carrying first substituent gets the lowest number. (3) Name of the branched chain alkane - The substituent name and the parent alkane are joined in one word and there is a hyphen between the number and the substituent name. (4) Alphabetical order of the side chains- When two or more substituent group should be listed alphabetically. (5) Numbering of different alkyl groups at equivalent positions - If two different alkyl groups are present at equivalent positions the numbering of the parent chain is done in such a way that alkyl group which comes first in the alphabetical order gets the lower number. (6) Naming of same alkyl groups at different positions - When two or more substituents are identical, indicate this by the use of prefixes di, tri, tetra and soon. Commas are used to separate number from each other. (7) Rule of larger number of subsitiuents - If a compound has two or more chains of the same length, the parent hydrocarbon is the chain with the greater number of substituents. (8) Numbering the complex substituent - Name such as iso-propyl, sec-butyl and tert-butyl are acceptable substituent name is the IUPAC system of nomenclature but systematic name are preferable. Systematic substituent names are obtained by numbering the substituent starting at the carbon that is attached to the parent hydrocarbon. This means that the carbon that is attached to the parent hydrocarbon is always the number-1 carbon of the substituent. In following compound CH_(3)-CH_(2)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-underset(CH_(3))underset(|)(CH)-overset(CH_(3))overset(|)(CH)-CH_(2)-CH_(3) The IUPAC name of the compound is ? CH_(3)-CH_(2)-underset(CH_(3))underset(|)(CH)-overset(CH_(3)-CH-CH_(2)-CH_(2)-CH_(3))overset(|)(CH)-underset(CH_(2)-CH_(3))underset(|)(CH)-CH_(2)-CH_(3)

Comprehension # 3 Branched - chain alkanes are named according to the following rules. (1) Longest chain Rule - Locate the longest continuous chain of carbon atoms. This chain determines the parent name of the alkane. (2) Lowest set of locants -The longest continuous chain are numbered by arabic numerals 1,2,3,4....from one end of chain to the other, in such a manner that carbon atom carrying first substituent gets the lowest number. (3) Name of the branched chain alkane - The substituent name and the parent alkane are joined in one word and there is a hyphen between the number and the substituent name. (4) Alphabetical order of the side chains- When two or more substituent group should be listed alphabetically. (5) Numbering of different alkyl groups at equivalent positions - If two different alkyl groups are present at equivalent positions the numbering of the parent chain is done in such a way that alkyl group which comes first in the alphabetical order gets the lower number. (6) Naming of same alkyl groups at different positions - When two or more substituents are identical, indicate this by the use of prefixes di, tri, tetra and soon. Commas are used to separate number from each other. (7) Rule of larger number of subsitiuents - If a compound has two or more chains of the same length, the parent hydrocarbon is the chain with the greater number of substituents. (8) Numbering the complex substituent - Name such as iso-propyl, sec-butyl and tert-butyl are acceptable substituent name is the IUPAC system of nomenclature but systematic name are preferable. Systematic substituent names are obtained by numbering the substituent starting at the carbon that is attached to the parent hydrocarbon. This means that the carbon that is attached to the parent hydrocarbon is always the number-1 carbon of the substituent. In following compound CH_(3)-CH_(2)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-underset(CH_(3))underset(|)(CH)-overset(CH_(3))overset(|)(CH)-CH_(2)-CH_(3) THe correct IUPAC name of the following compound is - CH_(3)-CH_(2)-CH_(2)-underset(CH_(3))underset(|)underset(CH-CH_(3))underset(|)(CH)-CH_(2)-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(3)

Fifty books be longing to different subjects viz. History (8), Geography (7), Literature (13), Psychology (8), Science (14) are placed on a shelf. They are arranged in an alphabetical order subject to condition that no two books of same subject are placed together so long as the books of other subjects are available, unless otherwise mentioned all counting is done from left. The last book of History is placed at what position from right?