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1) Na2O :- sodium oxide
4). (a) above picture
2)According to the question,
Constant Speed of the boy = 4 km/h
Time taken by the boy = 30 minutes = 0.5 hour
Applying the formula, distance = speed × time = ( 4 km/hr × 0.5 ) km = 2 km.
Thus, distance of school from his house is 2 km.
3) (a) all alkalis are bases because they will all neutralize acids, but not all bases are alkalis because not all bases will dissolve in water.
(b)By combining 1 cup of coffee grounds with 6 tablespoons of coconut oil and 3 tablespoons of sea salt or sugar, you can easily create an effective coffee scrub for your skin. ... You can still reap many benefits for your skin just by drinking coffee
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