Question

Q1- Reaction of 'magnesium' with air is
A) Exothermic reaction
B) Endothermic reaction
C) Reversible reaction
D) Substitution reaction

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

Q9- Consider equations: Ca⁺²(aq) + 2OH‾(aq)→Ca(OH)₂ (s). Precipitate of calcium hydroxide will be of
A) Green color
B) Blue color
C) Brown color
D) White color

Q10- In writing chemical equations, inclusion of state symbols shall be done while
A) Correct chemical formulae of reactants and products are written
B) The equation is being balanced to fulfill the law of conservation of mass
C) The equation has been balanced
D) The chemical formulae of products and reactants have been changed to bring about quick balancing

Q11- Consider equation: Pb⁺² (aq) + 2OH⁻ (aq) → Pb(OH)₂ (s). precipitate of lead (II) hydroxide will be of
A) Green color
B) Blue color
C) Brown color
D) White color

Q12- Consider equation: Cu⁺² (aq) + 2OH⁻(aq) → Cu(OH)₂ (s). precipitate of Copper Hydroxide (Cu(OH)₂) will be of
A) Green color
B) Blue color
C) Brown color
D) White color

Q13- Consider reaction: Na(s) + O₂(g) → Na₂O(s). Moles of sodium needed to balance equation would be
A) 1
B) 2
C) 3
D) 4

Q14- Consider reaction: S(s) + O₂(g) → SO₂. state of SO₂ in this reaction is
A) Liquid
B) Solid
C) Gaseous
D) All Three

Q15- Consider reaction: P(s) + O₂(g) → P₄O₁₀(s). Moles of O₂(g) needed to balance equation will be
A) 1
B) 3
C) 5
D) 7
Q16- Which of the following is (are) an endothermic process(es)?
(a) Dilution of sulphuric acid
(b) Sublimation of dry ice
(c) Condensation of water vapours
(d) Evaporation of water
A) Both (A) & (C)
B) Only (B)
C) Only (C)
D) Both (B) & (D)

Q17- In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the given can be used in place of lead nitrate?
A) Lead sulphate (insoluble)
B) Lead acetate
C) Ammonium nitrate
D) Potassium sulphate

Q18- Which of the given gases can be used for storage of fresh sample of an oil for a long time?
A) Carbon dioxide or oxygen
B) Nitrogen or oxygen
C) Carbon dioxide or helium
D) Helium or nitrogen

Q19- Fatty foods become rancid due to the process of ________
A) Oxidation
B) Corrosion
C) Reduction
D) Hydrogenation

Q20- Which information is not conveyed by a balanced chemical equation?
A) Physical states of reactants and products
B) Symbols and formulae of all the substances involved in a particular reaction
C) Number of atoms/molecules of the reactants and products formed
D) Whether a particular reaction is actually feasible or not

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

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