Subject :NSO Class : Class 7
Ishaan tested the nature of a few common substances with different indicators and recorded his observations as follows :
Substance P turned methyl orange yellow.
Substance Q turned phenolphthalein colourless.
Substance R did not have any effect on blue or red litmus.
Substance S turned China rose indicator green.
P, Q, R and S could be respectively
A Lemon juice, fermented milk, salt solution and milk of magnesia.
B Sugar solution, vinegar, water and curd.
C Lime water, apple juice, sugar solution and saliva
D None of these.
Ans 1:
Class : Class 10
Saliva is Acidic not basic
Ans 2:
Class : Class 7
Saliva is relatively neutral having a varrying pH between 6.7 and 7.3
Ans 3:
Class : Class 10
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
Ans 4:
Class : Class 9
a very weak acid is saliva and sometimes a very weak base.
Ans 5:
Class : Class 5
Ans 6:
Class : Class 6
Ans 7:
Class : Class 9
Ans 8:
Class : Class 8
Ans 9:
Class : Class 7
i should be option "D" as saliva is acidic in nature
Ans 10:
Class : Class 9
sof has gone made and is too much pride. for e
Ans 11:
Class : Class 7
Ans 12:
Class : Class 9
Saliva is slightly acidic