|
Classify the following processes into physical or chemical changes: Beating of aluminium metal to make aluminium foil. Digestion of food. Cutting of a log of wood into pieces. Burning of crackers
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0
|
3529
|
March 23, 2018
|
|
Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution
|
|
0
|
12872
|
March 23, 2018
|
|
Give two uses of the following acids. Nitric acid Hydrochloric acid Sulphuric acid
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|
0
|
710
|
March 23, 2018
|
|
Explain two neutralisation reactions related to daily life situation
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0
|
8251
|
March 23, 2018
|
|
Paheli observed that most of the fish in the pond of her village were gradually dying
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0
|
6077
|
March 23, 2018
|
|
You are provided with three test tubes A, B and C as shown in figure with different liquids
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|
0
|
2766
|
March 23, 2018
|
|
You are provided with four test tubes containing sugar solution, baking soda solution, tamarind solution, salt solution
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|
0
|
2845
|
March 23, 2018
|
|
A farmer was unhappy because of his low crop yield
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|
0
|
8526
|
March 23, 2018
|
|
Boojho, Paheli and their friend Golu were provided with a test tube each containing China rose solution which was pink in colour
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|
0
|
1766
|
March 23, 2018
|
|
Why is carbonic acid added to soft drinks?
|
|
0
|
2928
|
March 23, 2018
|
|
Write two uses of the following. Calcium hydroxide Sodium hydroxide
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|
0
|
911
|
March 23, 2018
|
|
Describe the process of neutralisation with the help of an example
|
|
0
|
9139
|
March 23, 2018
|
|
List three properties of acids bases
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|
0
|
656
|
March 23, 2018
|
|
Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution?
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|
0
|
1202
|
March 23, 2018
|
|
Explain why an antacid tablet is taken when you suffer from acidity. calamine solution is applied on the skin when an ant bites. factory waste is neutralised before disposing it into the water bodies
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|
0
|
1549
|
March 23, 2018
|
|
State differences between acids and bases
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|
0
|
1030
|
March 23, 2018
|
|
While playing in a park, a child was stung by a wasp
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|
0
|
3802
|
March 23, 2018
|
|
Is the distilled water acidic/basic/neutral? How would you verify it?
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|
0
|
871
|
March 23, 2018
|
|
Name the source from which litmus solution is obtained
|
|
0
|
4240
|
March 23, 2018
|
|
Look at the figures given below which shows solutions taken in test tubes A, B, C and D
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|
0
|
1814
|
March 23, 2018
|
|
What precautions should you take while using a laboratory thermometer?
|
|
0
|
3608
|
March 23, 2018
|
|
What precautions should you take while reading a clinical thermometer?
|
|
0
|
21119
|
March 23, 2018
|
|
Distinguish between the following. Land breeze and Sea breeze Convection and Conduction
|
|
0
|
2917
|
March 23, 2018
|
|
State similarities and differences between the laboratory thermometer and the clinical thermometer
|
|
0
|
31692
|
March 23, 2018
|
|
Why can you not keep your palm above a burning candle but you can keep it on the sides of a candle flame?
|
|
0
|
1847
|
March 23, 2018
|
|
Why do gases expand more than liquids?
|
|
0
|
1426
|
March 23, 2018
|
|
Why can you not use a clinical thermometer to measure the temperature of a candle flame?
|
|
0
|
899
|
March 23, 2018
|
|
Why does mercury not fall or rise in a clinical thermometer when taken out of the mouth?
|
|
0
|
1146
|
March 23, 2018
|
|
Look at figures given below. The length of wire PQ in case of A is equal to the diameter of the semicircle formed by the wire CDE, in case B
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|
0
|
2111
|
March 23, 2018
|
|
Observe the picture given below. Water is being boiled in a pan of wide base
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|
0
|
2228
|
March 23, 2018
|