Agastya Classes
Q1. Tick the correct answer (5x1=5)
1) The least reactive metal.
Answer: (b) Silver
2) To separation of two immiscible liquids liquids which separation technique is use.
Answer: (b) Separating funnel
3) Negatively Charged particle electrons discover by.
Answer: (c) J.J. Thomson
4) Name the radical which behaves like non-metal.
Answer: (d) Acid radicals (or Negative radical)
5) Positive catalyst which increases the rate of chemical reaction.
Answer: (a) MnO₂ (Manganese Dioxide)
Q2. Fill in the blanks (10x1=10)
i. ZnCO₃ → _______ + CO₂
Answer: ZnO (Zinc Oxide)
ii. A radical with one atom of sulphur and three atom of oxygen is _______
Answer: Sulphite (SO₃²⁻)
iii. The formula of aluminium sulphate is _______
Answer: Al₂(SO₄)₃
iv. State the atomicity of Neon _______
Answer: Monoatomic (1)
v. Seven horizontal rows called _______
Answer: Periods
vi. A non-metal which exists in the liquid state _______
Answer: Bromine
vii. The valency of carbon _______
Answer: 4 (Tetravalent)
viii. The formula of hydrogen chloride acid _______
Answer: HCl
xi. _______ show properties of metals and non-metal.
Answer: Metalloids
Q3. True or False (5x1=5)
1) Copper (II) hydroxide formed pale blue ppt.
Answer: True
2) Goldstein(1898) discovery Protons.
Answer: True
3) Double arrow (⇌) indicates reversible reaction.
Answer: True
4) Radical are of one type.
Answer: False
(Radicals are of two types: Acidic/Basic or Positive/Negative)
(Radicals are of two types: Acidic/Basic or Positive/Negative)
5) Highly reactive metals is poor conductors of heat and electricity.
Answer: False
(Metals are generally good conductors)
(Metals are generally good conductors)
Q4. Match the Following (5x1=5)
Match Column I with Column II
| Column I | Correct Match |
|---|---|
| i) Calcium hydroxide | d. Ca(OH)₂ |
| ii) Sodium bisulphite | c. NaHSO₃ |
| iii) Ammonium Sulphate | e. (NH₄)₂SO₄ |
| iv) Aluminium Phosphate | b. AlPO₄ |
| v) Copper(II) nitrate | a. Cu(NO₃)₂ |
Q5. Name the following (5x1=5)
1) The gas evolved when a dilute acid is added to chalk (limestone).
Answer: Carbon Dioxide (CO₂)
2) Two non-metals which react explosively when brought in close contact.
Answer: Hydrogen and Oxygen (or Phosphorus and Chlorate)
3) The radical containing one nitrogen and four hydrogen atoms.
Answer: Ammonium (NH₄⁺)
4) A lighter liquid from a heavier liquid.
Answer: Separating Funnel (Method) or Oil from Water (Example)
5) A low boiling point liquid from a high boiling point liquid.
Answer: Distillation
Q6. Word equations and Product Names (5x1=5)
a) Zn + 2HCl → ZnCl₂ + H₂
Word Equation: Zinc + Hydrochloric Acid → Zinc Chloride + Hydrogen
Products: Zinc Chloride, Hydrogen
Products: Zinc Chloride, Hydrogen
b) Zn + S → ZnS
Word Equation: Zinc + Sulphur → Zinc Sulphide
Product: Zinc Sulphide
Product: Zinc Sulphide
e) NH₃ + HCl → NH₄Cl
Word Equation: Ammonia + Hydrogen Chloride → Ammonium Chloride
Product: Ammonium Chloride
Product: Ammonium Chloride
Q7. Give formula of followings (5x1=5)
Q7. Write formulas for: Nitric acid, Sulphur dioxide, Carbonic acid, Caustic soda, Potassium hydroxide
- Nitric Acid: HNO₃
- Sulphur Dioxide: SO₂
- Carbonic Acid: H₂CO₃
- Caustic Soda: NaOH (Sodium Hydroxide)
- Potassium Hydroxide: KOH
Section B: Short & Long Answers
Q1. Differentiate between:
a) Elements and Compounds
b) Metals and Non-Metals
a) Elements and Compounds
b) Metals and Non-Metals
a) Elements vs Compounds:
Elements consist of only one type of atom (e.g., O₂), whereas Compounds consist of two or more different types of atoms chemically combined (e.g., H₂O).
b) Metals vs Non-Metals:
Metals are lustrous, malleable, ductile, and good conductors (e.g., Copper). Non-metals are non-lustrous, brittle, and poor conductors (e.g., Carbon).
Elements consist of only one type of atom (e.g., O₂), whereas Compounds consist of two or more different types of atoms chemically combined (e.g., H₂O).
b) Metals vs Non-Metals:
Metals are lustrous, malleable, ductile, and good conductors (e.g., Copper). Non-metals are non-lustrous, brittle, and poor conductors (e.g., Carbon).
Q2.A.1 Give symbol and valency of: Sodium, Magnesium, Calcium, Bisulphate
- Sodium: Symbol: Na, Valency: +1
- Magnesium: Symbol: Mg, Valency: +2
- Calcium: Symbol: Ca, Valency: +2
- Bisulphate: Symbol: HSO₄, Valency: -1
Q2.A.4 State Metal, non-metal and noble gas: Lead, Neon, Fluorine, Iodine
- Lead: Metal
- Neon: Noble Gas
- Fluorine: Non-metal
- Iodine: Non-metal
Q4(pg4) Give reasons: Silver salts are kept in dark colored bottles.
Answer: Silver salts (like Silver Nitrate) decompose easily in the presence of sunlight (Photolysis). Dark colored bottles cut off the light and prevent this decomposition.
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