Total cost of 14 pens and 21 books is Rs. 130 and the total cost of 6 pens and p books is Rs. 90. Which of the following cannot be the value of p ?
A) 4
B) 6
C) 10
D) 9
1 Answers
The standard entropies of `N_(2)(g),H_(2)(g)` and `NH_(3)(g)` are `191.5, 130.5,192.6JK^(-1)mol^(-1)` . The value of `DeltaS^(0)` during the formation
Correct Answer - A Formation of `NH_(3)` is `(1)/(2) N_(2)+(3)/(2)H_(2)toNH_(3)` `DeltaS^(@)=192.6-(1)/(2)(191.5)-(3)/(2)(130.5)` `=-98.9 JK^(-1) mol^(-1)`
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3 pens and 5 pencils together cost ₹ 35, whereas 5 pens and 3 pencils together cost ₹ 37. The cost of a pencil is ………………
Correct option is (C) ₹ 4 Let cost of 1 pen is Rs x and cost of 1 pencil is Rs y. \(\because\) Cost of 3 pens & 5 pencils is Rs 35. \(\therefore\) 3x...
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3 pens and 5 pencils together cost ₹ 35, whereas 5 pens and 3 pencils together cost ₹ 37. The cost of a pencil is ………………
2 Answers
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The total cost of six books, five pencils and seven sharpeners is Rs. 115 and that of eight books,
Correct option is (B) Book Let the cost of 1 book, 1 pencil and 1 sharpener is Rs. x, y & z respectively. \(\therefore\) According to given conditions 6x + 5y + 7z = 115 ...
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The total cost of six books, five pencils and seven sharpeners is Rs. 115 and that of eight books,
2 Answers
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Calculate (a) Implicit cost (b) Explicit cost and (c ) Econimic cost from the following: `{:(," Paticulars","(Rs. in Lakh)"),((i),"Payment of salaries
Correct Answer - Rs. 8600 Lakh (a) Explicit cost: (i)+(ii)=5000+2000=7000 (b) Implicit cost: (iii)+(v)+(vi)=1000+200+400=1600 (c ) Economic cost: (a) + (b)=7000+1600=86000
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The cost of 4 kg onion, 3 kg wheat and 2 kg rice is Rs 60. The cost of 2 kg onion, 4 kg wheat and 6 kg rice is Rs 90. The cost of 6 kg onion 2 kg whea
Let the cost of 1 kg wheat and 1 kg rice be ₹x, ₹ y and ₹ z respectively Given that , 4x+3y+2z=60 2x+4y+6z=90 6x+2y + 3z = 70 `rArr"...
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Two dice are thrown together and the total score is noted. The event E, F and G are a total 4, a total of 9 or more, and a total divisible by 5, respe
Two dices are thrown together i.e., sample spaces (S) =36`rArr`n(S)=36 E=A total of 4 = {(2,2),(3,1),(1,3)} `rArr n(E )=3` F= A total of 9 or more `={(3,6),(6,3),(4,5),(4,6),(5,4),(6,4),(5,5),(5,6),(6,5),(6,6)}` `rArr n(F)=10` G...
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If a box has 100 pens of which 10 are defective, then what is the probability that out of a sample of 5 pens drawn one by one with replacement atmost
Here, n=5,p`=10/100=1/10andq=9/10` `rle1` `rArrr=0,1` Also, `P(X=r)=""^(n)C_(r)p^(r )q^(n-r)` `therefore P(X=r)=P(r=0)+P(r=1)` `=""^(5)C_(0)(1/10)^(0)(9/10)^(4)` `=(9/10)^(5)+5cdot1/10cdot(9/10)^(4)` `(9/10)^(5)+1/2(9/10)^(4)`
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Given the following entropy values ( in `JK^(-1) "mol"^(-1)`) at 298 K and 1 atm: `H_(2)(g):130.6, Cl_(2)(g):223.0, HCl(g): 186.7`. The entropy change
Correct Answer - D `H_(2)(g) + Cl_(2)(g) to 2HCl(g) ` `Delta_(I)S=sumS_(m)""^(@)(P) -sumS_(m)""^(@)(R)` `Delta_(I)S^(@)=2xxS_(m)^(@)(HCl) - [S_(m)^(@)(Cl_(2)) + S_(m)^(@) (H_(2))]` `=(2xx186.7)-(223+ 130.6)` `=373.4-353.6` `=+19.8 JK^(-) "mol"^(-)`
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