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The given graph shows the variation of boiling point
of water with pressure.
Which of the following best represents the state(s)
of water at points X, Y and Z?
X | Y | Z | |
A | Gas, Liquid | Liquid | Solid |
B | Liquid | Liquid, Gas | Gas |
C | Solid | Liquid, Solid | Gas |
D | Liquid | Liquid, Gas | Solid |
ans c
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Fill in the blanks by choosing the correct option.Turmeric is one of the most commonly used spices in
our kitchen. It leaves a yellow stain on white clothes.
On rubbing with soap which is p in nature, the yellow
stain changes to q colour. Now, if we pour some
r containing s over this stain, it again becomes
yellow in colour due to t .
P | Q | R | S | T | |
A | Alkaline | Red | Lemon juice | Acetic acid | Formation of water |
B | Acidic | Green | Lime Lime | Sodium hydroxide | Neutralisawatertion reaction |
C | Neutral | Dark pink | Lime water | Potassium hydroxide | Formation of water |
D | Alkaline | Red | Lemon juice | Citric acid | Neutralisation reaction |
Ans 1:
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Read the given statements and state (T) for true and (F) for false ones.
I. A compound can be broken down into its constituent
elements by chemical methods.
II. A compound always contains the same elements
combined together chemically in a fixed ratio.
III. A compound retains the properties of its constituent elements.
IV. When two or more elements or compounds are brought together, they always react chemically.
V. Tap water is a compound.
I | II | III | IV | V | |
---|---|---|---|---|---|
A | (F) | (T) | (T) | (F) | (F) |
B | (T) | (T) | (F) | (F) | (F) |
C | (F) | (F) | (F) | (T) | (T) |
D | (T) | (F) | (T) | (F) | (T) |