Question

Q2- What chemicals are used in fireworks?
A) Copper chloride
B) Calcium chloride
C) Barium chloride
D) All of above
Q3- When a magnesium ribbon is burnt in air, the ash formed is
A) Black B) White C) Yellow D) Pink
Q4. Color of magnesium oxide is
A) White B) Blue C) Grey
D) Pink
Q5- If magnesium is gently heated, it forms
A) Magnesium oxide
B) Magnesium sulfide
C) Magnesium nitrite
D) Magnesium carbonate
Q6. When carbon dioxide is passed through lime water,
A) Calcium hydroxide is formed B) White precipitate of CaO is formed
C) Lime water turns milky D) Color of lime water disappears.
Q7. When crystals of lead nitrate are heated strongly in a dry test tube
A) Crystals immediately melt B) A brown residue is left
C) White fumes appear in the tube D) A yellow residue is left
Q8-Color of Solid magnesium is
A) Dark grey B) Silver grey C) Black D) Whitish silver
09. Consider equations: Ca' (aq) + 2OH(aq)-Ca(OH). (s). Precipitate
of calcium hydroxide will be of
A) Green color B) Blue color C) Brown color D) White colour​

Answer 1

Answer:

Q2. (D) all of the above .

Answer 2

Answer:

Ans 2) (D)

Ans 3)(B)

Ans4)(A)

Ans5)(A)

Ans6)(C)

Ans 7)(D)

Ans8)(B)

Ans9)(D)

Explanation:

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