CHEMICAL REACTIONS & EQUATIONS

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H₂SO₄ + 2NaOH → ________. How many hydrogen (H) atoms must be present in the products?

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4

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A teacher writes the equation representing the chemical reaction between hydrochloric acid and sodium on the board.HCl + Na → NaCl + H₂The teacher states that the equation has not been balanced. Which of these correctly shows the products of this reaction after the equation has been balanced? Options: Na₂Cl + H₂,  2NaCl + H₂, NaCl + 2H₂,  2NaCl + 2H₂

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2NaCl + H₂

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The following reaction is an example of: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g) (i) displacement reaction (ii) combination reaction (iii) redox reaction (iv) neutralisation reaction

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displacement reaction and redox reaction

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Which statements about the reaction 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g) are correct? (i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent

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(i), (ii) and (iv)

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Which among the following is(are) double displacement reaction(s)? (i) Pb + CuCl2 → PbCl2 + Cu (ii) Na2SO4 + BaCl2 → BaSO4 + 2NaCl (iii) C + O2 → CO2 (iv) CH4 + 2O2 → CO2 + 2H2O

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(ii) Na2SO4 + BaCl2 → BaSO4 + 2NaCl

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Mole ratio of hydrogen and oxygen gases liberated during electrolysis of water

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2:1

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Which of the following are combination reactions? (i) 2KClO3⎯Heat⎯→ 2KCl + 3O2 (ii) MgO + H2O ⎯→ Mg(OH)2 (iii) 4Al + 3O2 ⎯→ 2Al2 O3 (iv) Zn + FeSO4 → ZnSO4 + Fe

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(ii) MgO + H2O ⎯→ Mg(OH)2 and (iii) 4Al + 3O2 ⎯→ 2Al2 O3

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Which of the following reactions is balanced? Options: 2CH₄ + O₂ -> CO₂ + H₂O, CH₄ + 2O₂ -> CO₂ + H₂O, CH₄ + 2O₂ -> CO₂ + 2H₂O, None of the chemical equations are balanced.

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CH₄ + 2O₂ -> CO₂ + 2H₂O

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Chemical formula of lime water is:

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Ca(OH)₂

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Silver article turns black when kept in open for a few days due to formation of: H2S, AgS, AgSO4, Ag2S

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Ag2S