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CHEMICAL REACTIONS
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ELEMENTS, COMPOUNDS & MIXTURES
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Why is tap water a mixture ?
Lassaigne's extract is prepared in distilled water and not in tap water. Explain.
We can get water from a mixture of salt and water by evaporation.
Tap water is a mixture. True or false?
It is easier to lift a heavy stone under water than in air. Explain.
A mixture has 18 g water and 414 g ethanol . The mole fraction of water in mixture is (assume ideal behaviour of the mixture )______.
The given below experiment is to show tap water contains dissolved gases. Based on this, answer the below questions: Name the quantity which tells you about the presence of dissolved gases in tap water from the experiment?
Classify the following substances as either being a homogenous or heterogenous mixture? (1) Sugar + Water (2) Sand + Water (3) mixture of different pulses (4) Air in the atmospheric column (5) Soda (6) Alloys
In a mixture of 126 "kg" of milk and water, milk and water are in the ratio 5 : 2 . How much water must be added to the mixture to make this ratio 3 : 2 ?
Two taps A and B supply water at temperature 10^(@)C and 50^(@)C respectively . Tap A alone fills the tank in 1 hour and tap B alone fills the tank in 3 hour. If we open both the taps together in the empty tank , if the final temperature of the water in the completely filled tank is found to be 5alpha ("in" "^(@)C) . Find the value of alpha . Neglect loss of heat to surrounding and heat capacity of the tank.
ICSE-ELEMENTS , COMPOUNDS AND MIXTURES -Think and answer
