Which of the following pairs of substance will react further with oxygen to form a higher oxide?
A. CO2 and H2O B. NO and H2O C. CO and CO2 D. SO2 and NO Correct Answer: Option D – SO2 and NO
The ion that will give a white precipitate with aqueous NaOH and soluble in excess of the base is?
A. Ca²+ B. Mg²+ C. Zn²+ D. Cu²+ Correct Answer: Option C = Zn²+
Dynamic equilibrium describes a situation where?
A. a reaction gives back the reactant B. te concentration of the reactant and products is equal C. both forward and and reverse reactions proceed at the same rate D. reactants are converted to products Correct Answer: Option C – both forward and and reverse...
What weight of NaCl is needed to make 2.0 dm³ of a 1.5M solution? [Na = 23, Cl = 35.5]
A. 116 g B. 175 g C. 87 g D. 58 g Correct Answer: Option B – 175 g Explanation Molar mass of Nacl = 23 + 35.5 = 58.5 g/mol Number of moles of Nacl = conc. in mol/dm³ X vol. in dm³ = 1.5 X 2.0 = 3.0 moles 1 mole of NaCl has a weight of 58.5 X 3 =...Products
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