Class 12th

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5 months ago

Despite all of the institutional strategies adopted in early America to assure some measure of economic security, huge changes would sweep through America which would, in time, undermine the existing institutions. Four important demographic changes happened in America beginning in the mid-1880s that rendered the traditional systems of economic security increasingly unworkable are the Industrial Revolution, the urbanization of America, the disappearance of the "extended" family and a marked increase in life expectancy.

The Industrial Revolution transformed the majority of working people from self-employed agricultural workers into wage

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Payal Gupta

Contributor-Level 10

Economic security has not been the major changes in America that has been discussed by the author. The author has mentioned the changes in the first paragraph only.

New answer posted

5 months ago

The passage below is accompanied by a set of questions. Choose the best answer to each question.

Despite all of the institutional strategies adopted in early America to assure some measure of economic security, huge changes would sweep through America which would, in time, undermine the existing institutions. Four important demographic changes happened in America beginning in the mid-1880s that rendered the traditional systems of economic security increasingly unworkable are the Industrial Revolution, the urbanization of America, the disappearance of the "extended" family and a marked increase in life expectancy.

The Industrial Revolut

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Payal Gupta

Contributor-Level 10

Option B explains the primary reason very well with all the facts intact. Option A is close but doesn't convey the complete fact and other options are far-fetched.

New answer posted

5 months ago

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A
alok kumar singh

Contributor-Level 10

In B r O 4 , B r has +7 O.S, therefore it only acts as a oxidizing reagent, does not undergo disproportionation reaction

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5 months ago

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Vishal Baghel

Contributor-Level 10

P C l 5 ( g ) P C l 3 ( g ) + C l 2 ( g ) (first order reaction)

K = 2 . 3 0 3 1 2 0 l o g ( 5 0 1 0 )      

K = 2 . 3 0 3 * l o g 5 1 2 0 m i n = 2 . 3 0 3 * 0 . 6 9 8 9 1 2 0 = 0.0134 min-1

Rate constant at 300K = 1.34 * 10-2min-1 [the nearest integer = 1.0]

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5 months ago

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Vishal Baghel

Contributor-Level 10

Total pressure of mixture =   P T o t a l = X A * P A o + X B * P B o = 9 0 * 0 . 6 + 1 5 * 0 . 4 = 6 0 m m

Mole fraction of B in vapour phase, ( X B ' ) = X B * P B o P T o t a l

X B ' = 0 . 4 * 1 5 6 0 = 0 . 1 = 1 * 1 0 1  

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5 months ago

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Vishal Baghel

Contributor-Level 10

In fcc structure of diamond four C present in fcc lattice and other four C present in tetrahedral voids where 50% of tetrahedral voids are occupied. Hence number of carbon atoms present per unit cell of diamond is 8.

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5 months ago

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Vishal Baghel

Contributor-Level 10

N i C l 2 + N a C N O . A . s t r o n g [ N i ( C N ) 6 ] 2

Complex has Ni4+ and strong ligand, hence following are the metal ion electronic configuration

Change of unpaired electron = 2

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