Question
What is a neutralisation reaction? Give two examples.
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(2) Draw a ray diagram showing the position, nature and size of the image formed by a convex mirror, when the object is placed anywhere between infinite distance and pole (or at finite distance from the mirror).
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Give reasons
$(a)$ Platinum, gold and silver are used to make jewellery.
$(b)$ Sodium, potassium and lithium are stored under oil.
$(c)$ Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
→$(a)$ Platinum, gold and silver are used to make jewellery.
$(b)$ Sodium, potassium and lithium are stored under oil.
$(c)$ Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
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→$(a)$ Oxidation
$(b)$ Reduction
Atul built a small house. He used well-insulated copper wires of good quality for wiring and switches, sockets and plugs too. He however, had a room-heater of poor quality. Once on a winter night he was sleeping with his family in a closed room with the heater ON. During sleep he was suffocated. Hence he woke up and found flames of heater on fire. His son Raghav got up quickly and switched off the main switch. He made a call to the fire brigade. The fire crew of fire brigade reached quickly and put off fire. Atul and his family thanked the firemen.
(1) How Atul's heater was on fire?
(2) Name the safety device missing in the electric wiring of Atul's house.
(3) What values do you learn from Raghav in this episode?
(1) How Atul's heater was on fire?
(2) Name the safety device missing in the electric wiring of Atul's house.
(3) What values do you learn from Raghav in this episode?
What is meant by substitution reaction? Explain.
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