For a series of indicators, the colour and `pH` range over which colour change takes place are as follows:
`{:("Indicator",,"Colour change over pH range"),(U,,"Yellow to blue pH 0.0 to 1.6"),(V,,"Red to yellow pH 2.8 to 4.1"),(W,,"Red to yellow pH 4.2 to 5.8"),(X,,"Yellow to blue pH 6.0 to 7.7"),(Y,,"Colourless to red pH 8.2 to 10.0"):}`
Which of the followinfg statements is correct ?

Which acid -base indicator will give the best results for the titration of an aqueous ammonia solution with 0.10 M HCI ? {:("Indicator","Colour Change","pH range"),("Methyl violet ", red to blue,0 to 2),("Methyl red", red to yellow, 4 to 6),("Cresol red", yellow to "purple", 7 to 9),("Phenolphthalein", "colourless" to "pink", 8 to 10):}

The variation of pH during the titration of 0.5 N Na_2CO_3 with 0.5 N HCl is shown in the given graph.The following table indicates the colour and pH ranges of different indicators : {:("Indicator","Range of colour change","Colour in acid","Colour in base"),("Thymol blue",1.2 "to" 2.8,"Red","Yellow"),("Bromocresol red",4.2 "to" 6.3,"Red","Yellow"),("Bromothymol blue",6.0"to"7.6,"Yellow","Blue"),("Cresolphethalein",8.2 "to" 9.8,"Colourless","Red"):} Based on the graph and the table which of the following statements are true ?

Payal has to arrange the following in DECREASING order of hydroxide ion concentration. wine (pH 4.0), milk of magnesia (pH 10.5), blood (pH 7.4) Which of the following arrangements is correct?