SELECT * FROM question_mgmt as q WHERE id=4362 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=12 AND subId=16 AND chapterId=367 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 8th science Materials: Metals and Non-Metals fill in the blanks a phosphorus is very

Question:

Fill in the blanks :
(a) Phosphorus is very _________ non-metal.
(b) Metals are ________ conductors of heat and ________ .
(c) Iron is __________ reactive than copper.
(d) Metals react with acids to produce _________ gas.

Answer:

(a) Reactive

Phosphorus is an reactive non- metal. It catches fire easily when exposed to air.

(b) Good, electricity

Conductors are those from which heat and electricity can pass through easily. Metals are good conductor of heat and electricity.

(c) More

Iron is more reactive than copper so it can replace copper easily from its solution.

(d) Hydrogen

When metal reacts with acid. It produces hydrogen gas which burns with a pop sound whereas non- metal generally do not react with acids.


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