Chemistry-
General
Easy

Question

For there action C2H5OH(l)+3O2(g)→2CO2(g)+3H2O(l) Which one istrue -

  1. DH=DE–RT    
  2. DH=DE+RT    
  3. DH=DE+2RT    
  4. DH=DE–2RT    

The correct answer is: DH=DE–RT

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2Zn+O2 3/2 →2ZnODG°=616J 2Zn+S2→2ZnSDG°=–293J S2+2O2 3/4 →2SO2DG°=408J DG°forthefollowingreactionis-2ZnS+3O2 3/4 →2ZnO+2SO

2Zn+O2 3/2 →2ZnODG°=616J 2Zn+S2→2ZnSDG°=–293J S2+2O2 3/4 →2SO2DG°=408J DG°forthefollowingreactionis-2ZnS+3O2 3/4 →2ZnO+2SO

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A random variable has the following distribution.

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Then for the values, A = K, B = Mean, C = Variance, the ascending order is

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chemistry-General
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A random variable X has the following distribution

The value of k and P(X<3) are equal to

A random variable X has the following distribution

The value of k and P(X<3) are equal to

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If m and 2 s are the mean and variance of the random variable X, whose distribution is given by

If m and 2 s are the mean and variance of the random variable X, whose distribution is given by

maths-General
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The distribution of a random variable X is given below

The value of k is

The distribution of a random variable X is given below

The value of k is

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maths-

The number of different triangles formed by joining the points A, B, C, D, E, F and G as shown in the figure given below is

No. of different triangles equals 7 subscript C subscript 3 end subscript end subscript minus 5 subscript C subscript 3 end subscript end subscript minus 3 subscript C subscript 3 end subscript end subscript equals 24

The number of different triangles formed by joining the points A, B, C, D, E, F and G as shown in the figure given below is

maths-General
No. of different triangles equals 7 subscript C subscript 3 end subscript end subscript minus 5 subscript C subscript 3 end subscript end subscript minus 3 subscript C subscript 3 end subscript end subscript equals 24
General
maths-

The number of ways that the letters of the word ”PERSON” can be placed in the squares of the adjoining figure so that no row remains empty


The number of ways that the letters of the word ”PERSON” can be placed in the squares of the adjoining figure so that no row remains empty


maths-General
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maths-

The value of open vertical bar table row cell 1 to the power of 2 end exponent end cell cell 2 to the power of 2 end exponent end cell cell 3 to the power of 2 end exponent end cell row cell 2 to the power of 2 end exponent end cell cell 3 to the power of 2 end exponent end cell cell 4 to the power of 2 end exponent end cell row cell 3 to the power of 2 end exponent end cell cell 4 to the power of 2 end exponent end cell cell 5 to the power of 2 end exponent end cell end table close vertical bar is

open vertical bar table row cell 1 to the power of 2 end exponent end cell cell 2 to the power of 2 end exponent end cell cell 3 to the power of 2 end exponent end cell row cell 2 to the power of 2 end exponent end cell cell 3 to the power of 2 end exponent end cell cell 4 to the power of 2 end exponent end cell row cell 3 to the power of 2 end exponent end cell cell 4 to the power of 2 end exponent end cell cell 5 to the power of 2 end exponent end cell end table close vertical bar{Operate R subscript 3 end subscript rightwards arrow R subscript 3 end subscript minus R subscript 2 end subscript,R subscript 2 end subscript rightwards arrow R subscript 2 end subscript minus R subscript 1 end subscript}
= open vertical bar table row 1 4 9 row 3 5 7 row 5 7 9 end table close vertical bar equals 1 left parenthesis 45 minus 49 right parenthesis minus 4 left parenthesis 27 minus 35 right parenthesis plus 9 left parenthesis 21 minus 25 right parenthesis
= negative 4 plus 32 minus 36 equals negative 8.

The value of open vertical bar table row cell 1 to the power of 2 end exponent end cell cell 2 to the power of 2 end exponent end cell cell 3 to the power of 2 end exponent end cell row cell 2 to the power of 2 end exponent end cell cell 3 to the power of 2 end exponent end cell cell 4 to the power of 2 end exponent end cell row cell 3 to the power of 2 end exponent end cell cell 4 to the power of 2 end exponent end cell cell 5 to the power of 2 end exponent end cell end table close vertical bar is

maths-General
open vertical bar table row cell 1 to the power of 2 end exponent end cell cell 2 to the power of 2 end exponent end cell cell 3 to the power of 2 end exponent end cell row cell 2 to the power of 2 end exponent end cell cell 3 to the power of 2 end exponent end cell cell 4 to the power of 2 end exponent end cell row cell 3 to the power of 2 end exponent end cell cell 4 to the power of 2 end exponent end cell cell 5 to the power of 2 end exponent end cell end table close vertical bar{Operate R subscript 3 end subscript rightwards arrow R subscript 3 end subscript minus R subscript 2 end subscript,R subscript 2 end subscript rightwards arrow R subscript 2 end subscript minus R subscript 1 end subscript}
= open vertical bar table row 1 4 9 row 3 5 7 row 5 7 9 end table close vertical bar equals 1 left parenthesis 45 minus 49 right parenthesis minus 4 left parenthesis 27 minus 35 right parenthesis plus 9 left parenthesis 21 minus 25 right parenthesis
= negative 4 plus 32 minus 36 equals negative 8.
General
maths-

The determinant open vertical bar table row a b cell a minus b end cell row b c cell b minus c end cell row 2 1 0 end table close vertical bar is equal to zero if a comma b comma c are in

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Þ negative a b plus a c plus 2 b to the power of 2 end exponent minus 2 b c plus a b minus 2 a c minus b to the power of 2 end exponent plus 2 b c equals 0
Þ b to the power of 2 end exponent minus a c equals 0 Þ b to the power of 2 end exponent equals a c.

The determinant open vertical bar table row a b cell a minus b end cell row b c cell b minus c end cell row 2 1 0 end table close vertical bar is equal to zero if a comma b comma c are in

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On expanding, negative a left parenthesis b minus c right parenthesis plus 2 b left parenthesis b minus c right parenthesis plus left parenthesis a minus b right parenthesis left parenthesis b minus 2 c right parenthesis equals 0
Þ negative a b plus a c plus 2 b to the power of 2 end exponent minus 2 b c plus a b minus 2 a c minus b to the power of 2 end exponent plus 2 b c equals 0
Þ b to the power of 2 end exponent minus a c equals 0 Þ b to the power of 2 end exponent equals a c.
General
Maths-

If a not equal to 6 comma b comma c satisfy open vertical bar table row a cell 2 b end cell cell 2 c end cell row 3 b c row 4 a b end table close vertical bar equals 0 comma then a b c equals

A to the power of 3 end exponent equals I
Þ left parenthesis a minus 6 right parenthesis left parenthesis b to the power of 2 end exponent minus a c right parenthesis equals 0 rightwards double arrow b to the power of 2 end exponent minus a c equals 0, equals 3 open square brackets fraction numerator negative 1 plus square root of 3 i over denominator 2 end fraction minus fraction numerator negative 1 minus square root of 3 i over denominator 2 end fraction close square brackets equals 3 square root of 3 i
therefore a c equals b to the power of 2 end exponent rightwards double arrow a b c equals b to the power of 3 end exponent.

If a not equal to 6 comma b comma c satisfy open vertical bar table row a cell 2 b end cell cell 2 c end cell row 3 b c row 4 a b end table close vertical bar equals 0 comma then a b c equals

Maths-General
A to the power of 3 end exponent equals I
Þ left parenthesis a minus 6 right parenthesis left parenthesis b to the power of 2 end exponent minus a c right parenthesis equals 0 rightwards double arrow b to the power of 2 end exponent minus a c equals 0, equals 3 open square brackets fraction numerator negative 1 plus square root of 3 i over denominator 2 end fraction minus fraction numerator negative 1 minus square root of 3 i over denominator 2 end fraction close square brackets equals 3 square root of 3 i
therefore a c equals b to the power of 2 end exponent rightwards double arrow a b c equals b to the power of 3 end exponent.
General
chemistry-

End product of the following sequence of reaction is :

End product of the following sequence of reaction is :

chemistry-General
General
chemistry-

Arrange in the increasing order of boiling points:
i) 
ii) 
iii) 

iv) 

Arrange in the increasing order of boiling points:
i) 
ii) 
iii) 

iv) 

chemistry-General
General
maths-

Number of rectangles in fig. shown which are not squares is

Total number of rectangles
equals to the power of 7 C subscript 2 cross times to the power of 5 C subscript 2 minus No.of squares
equals 210 minus No. of squares
therefore Number of squares  equals 24 plus 15 plus 8 plus 3 equals 50
not stretchy downwards arrow space of 1em not stretchy downwards arrow space of 1em not stretchy downwards arrow  not stretchy downwards arrow
open parentheses table attributes columnalign left columnspacing 1em end attributes row cell 1 cross times 1 end cell row cell text  area  end text end cell end table close parentheses open parentheses table attributes columnalign left columnspacing 1em end attributes row cell 2 cross times 2 end cell row cell text  area  end text end cell end table close parentheses open parentheses table attributes columnalign left columnspacing 1em end attributes row cell 3 cross times 3 end cell row cell text  area  end text end cell end table close parentheses open parentheses table attributes columnalign left columnspacing 1em end attributes row cell 4 cross times 4 end cell row cell text  area  end text end cell end table close parentheses

Number of rectangles in fig. shown which are not squares is

maths-General
Total number of rectangles
equals to the power of 7 C subscript 2 cross times to the power of 5 C subscript 2 minus No.of squares
equals 210 minus No. of squares
therefore Number of squares  equals 24 plus 15 plus 8 plus 3 equals 50
not stretchy downwards arrow space of 1em not stretchy downwards arrow space of 1em not stretchy downwards arrow  not stretchy downwards arrow
open parentheses table attributes columnalign left columnspacing 1em end attributes row cell 1 cross times 1 end cell row cell text  area  end text end cell end table close parentheses open parentheses table attributes columnalign left columnspacing 1em end attributes row cell 2 cross times 2 end cell row cell text  area  end text end cell end table close parentheses open parentheses table attributes columnalign left columnspacing 1em end attributes row cell 3 cross times 3 end cell row cell text  area  end text end cell end table close parentheses open parentheses table attributes columnalign left columnspacing 1em end attributes row cell 4 cross times 4 end cell row cell text  area  end text end cell end table close parentheses
General
maths-

Digit at unit place of sum (1!)2 +(2!)2 +(3!)2 ……… +(2008!)2 is

becauseS = 1 + 4 + 36 + 576 + …….. +(2008!)2= 617 + all other terms will have 0 at unit place

Digit at unit place of sum (1!)2 +(2!)2 +(3!)2 ……… +(2008!)2 is

maths-General
becauseS = 1 + 4 + 36 + 576 + …….. +(2008!)2= 617 + all other terms will have 0 at unit place