dhoran 12 arthshashtra ekam kasoti paper solution January 2022 | Std 12 Economics Ekam Kasoti 2022

You have four solutions A, B, C and D. The pH of solution A is 6, B is 9, C is 12 and D is 7. (a) Identify the most acidic and most basic solutions. (b) Arrange the above four solutions in the increasing order of H^+ ion concentration. (c) State the change in colour of pH paper on dipping in solution C and D.

(i) Explain why is hydrochloric acid a strong acid and acetic acid, a weak acid ? How can it be verfied ? (ii) Explain why equeous solution of an acid conducts electricity. (iii) You have four solutions A, B,C and D. The pH of solution A is 6, B is 9, C is 12 and D is 7. (a) Identify rhe most acidic and most basic solutions. (b) Arrange the above four solutions in the increasing order of H^(+) ion concentration. (c ) State the change in colour of pH paper on dipping in solution C and d.

Cash is the mother's milk of crime. Its appeal to criminals is clear. Unlike cars or paintings, it can be concealed immediately after being pinched. It has no security features to prevent its being easily and anonymously spent on legal or illegal goods. Unlike nearly any other object that can be stolen, it needs no fence. But a new paper from the National Bureau of Economic Research found that electronic payments led to a drop of 9.8% in the overall crime rate and caused the rates of burglary, assault, and larceny to fall by 7.9%, 12.5%, and 9.6% respectively. The introduction of electronic payments was also associated with a lower number of arrests, an indication that the crime rates decline did not stem from more aggressive policing. The paper said that the shift from cash to cards since 1990 debit-card transactions have risen 27-fold, whereas cash volume has grown by just 4% a year may have also contributed to the decline in crime. Which of the following conclusions can most properly be drawn from the information above?

SRCC Ltd. has issued on 1st April, 2017, 20,000, 12% debentures of Rs. 100 each redeemable by draw of lots as under : {:("During the year ended on 31st March, 2018",,:,15%),("During the year ended on 31st March, 2019",,:,25%),("During the year ended on 31st March, 2020",,:,15%),("During the year ended on 31st March, 2021",,:,25%),("During the year ended on 31st March, 2022",,:,20%):} How much minimum investment should be made by SRCC Ltd. as per Companies Act, 2013 before redemption of debentures ? When should it be made ?

Amongst the following, the total number of compounds whose equesous solution turns red litmus paper blue is: {:(NaCN,KCl,CH_(3)COONH_(4),NaH_(2)PO_(4),ZnCl_(2), Na_(3)PO_(4)),(Fe(NO_(3))_(3),Na_(2)CO_(3),NH_(4)Cl,NaHCO_(3),Na_(2)C_(2)O_(4),Na_(2)HPO_(4)):} Given: {:("Acid",ka_(1),ka_(2),ka_(3)),(H_(3)PO_(4),10^(-3),10^(-8),10^(-12)),(H_(2)CO_(3),10^(-6),10^(-11),-),(H_(2)CO_(3),10^(-2),10^(-5),-):}