121.
In an acid solution, the pH is
A
greater than p(OH)
B
less than p(OH)
C
equal to p(OH)
D
none of these
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In an acid solution, the pH is
greater than p(OH)
less than p(OH)
equal to p(OH)
none of these
If the ph of a solution is 7.5, its nature is
strongly acidic
weakly acidic
basic
neutral
Bottle A contains oxalic acid and bottle B contains sodium carbonate solution. When pH paper is dipped in each of the solutions, the colour seen in A and B respectively will be
blue, orange
green, blue
orange, green
orange, blue
As the ph increases
basic strength increases
basic strength decreases
none of these
acidic strength increases
A student tested the pH of distilled water using paper and observed green colour. After adding a few drops of dilute solution, the pH was tested again. The colour change now observed would be
green
red
orange
blue
A student tested the ph of distilled water and found that the colour of the ph paper changed it to green. He checked the ph again after dissolving common salt in it. the color of the ph paper this time is
yellow
red
blue
green
A student observed that the colour of pH paper changes to green when she dipped it in water. She added a few drops of concentrated hydrochloric acid to the water. The colour of pH paper would turn to
apple green
dark blue
lemon yellow
light red
A solution with pH = 0 is
basic
amphoteric
neutral
acidic
A little dilute hydrochloric acid is dropped on a pH paper. The colour of the pH paper turns to
light green
light blue
bright yellow
dark pink
A liquid sample turned red litmus paper blue. This indicates that the liquid sample is of
distilled water
sodium hydroxide solution
hydochloric acid
an alcohol
A fruit juice is tested for its ph value. What could be its possible ph if it turns red
more than 8
7
between 6.5 and 7.5
less than 3
A few drops of a liquid X were added to distilled water. It was observed that the pH of the water decreased. The liquid X is
sugar solution
common salt solution
baking soda solution
lemon juice
A drop of solution X is placed on a strip of a ph paper. A deep red color is produced. The solution X is
HCL
Water
Sodium Bicarbonate
A drop of colourless liquid was placed on blue litmus paper. The litmus paper turned red. The liquid could be
dilute sodium hydroxide solution
distilled water
sodium bicarbonate solution
dilute hydrochloric acid
A drop of a liquid sample was put on the pH paper. The colour of the pH paper turned blue. The liquid sample could be of
hydochloric acid
sodium bicarbonate solution
ethanoic acid
lemon juice
A colourless liquid sample was tested with pH paper strip. The colour of the strip changed reddish pink. The sample could be
sodium hydroxide solution
distilled water
ethanoic acid solution
tap water
Which statement is true about isotopes of the same element?
They have the same number of protons.
They have the same number of neutrons.
They have a different atomic number.
They have the same mass.
Which of the following is a property of alkali metals?
They are so hard they cannot be cut.
They are very reactive.
They are stored in water.
They have few uses.
Which of the following statements describes most metals?
They are easily shattered.
They are gases at room temperature.
They are dull.
They are good conductors of electric current.
Which one of the following tells the physical state of an element at room temperature?
the atomic number
the color of the chemical symbol
the atomic mass
the element name