Chemistry

If the heat of combustion of hydrogen is -285.8kJ; What is the heat of formation of water?If the heat of combustion of hydrogen is -285.8kJ; What is the heat of formation of water?

If the heat of combustion of hydrogen is -285.8kJ; What is the heat of formation of water?

A. +571.6 kJ B. -571.6 kJ C. -285.8 kJ D. +285.8 kJ Correct Answer: Option C = -285.8 kJ

5 years ago
How many moles of sodium trioxocarbonate (IV) are there in a 25 cm³ solution which required 10cm³ of 0.05 mol dm-³ hydrochloric acid solution to neutralize it?How many moles of sodium trioxocarbonate (IV) are there in a 25 cm³ solution which required 10cm³ of 0.05 mol dm-³ hydrochloric acid solution to neutralize it?

How many moles of sodium trioxocarbonate (IV) are there in a 25 cm³ solution which required 10cm³ of 0.05 mol dm-³ hydrochloric acid solution to neutralize it?

Na2CO3(g) + 2HCl(aq) → 2NaCl(aq) + H2O(l) + CO2(g) A. 1.000 mole B. 0.100 mole C. 0.010 mole` D. 0.111…

5 years ago
In the electrolysis of CuSO4(g) using platinum electrodes; the reaction at the anode is?In the electrolysis of CuSO4(g) using platinum electrodes; the reaction at the anode is?

In the electrolysis of CuSO4(g) using platinum electrodes; the reaction at the anode is?

A. 4H+ + 4e− → 2H2 B. 4OH− + 4e− → 2H2O + O2 C. 2OH− + 2e− → 2OH…

5 years ago
In which of the following is the oxidation number of sulphur equal to -2?In which of the following is the oxidation number of sulphur equal to -2?

In which of the following is the oxidation number of sulphur equal to -2?

A. SO3 B. S8 C. H2S D. SO2 Correct Answer: Option C = H2S

5 years ago
The solution that will conduct the highest amount of electricity is?The solution that will conduct the highest amount of electricity is?

The solution that will conduct the highest amount of electricity is?

A. 0.5 mol dm−³ of hydrochloric acid B. 2.0 mol dm−³ of hydrochloric acid C. 0.5 mol dm−³ ethanoic acid…

5 years ago
Zinc and carbon rods are used as anode and cathode respectively in a?Zinc and carbon rods are used as anode and cathode respectively in a?

Zinc and carbon rods are used as anode and cathode respectively in a?

A. Leclanche cell B. lead accumulator C. Daniel cell D. voltaic cell Correct Answer: Option A - Leclanche cell Explanation…

5 years ago
The ion that can be used as an oxidizing agent is?The ion that can be used as an oxidizing agent is?

The ion that can be used as an oxidizing agent is?

  A. Au³+ B. Fe³+ C. ClO− D. Ca²+ Correct Answer: Option C = ClO− Explanation All the other options…

5 years ago
The mass of carbon(IV)oxide produced on burning 78 g of ethyne is? [C =12, O = 16, H = 1]The mass of carbon(IV)oxide produced on burning 78 g of ethyne is? [C =12, O = 16, H = 1]

The mass of carbon(IV)oxide produced on burning 78 g of ethyne is? [C =12, O = 16, H = 1]

2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g) A. 264 g B. 39 g C. 352 g D. 156 g Correct…

5 years ago
If 30cm³ of gas at 50°C is warmed to 80°C at a fixed pressure; the fractional increase in volume is?If 30cm³ of gas at 50°C is warmed to 80°C at a fixed pressure; the fractional increase in volume is?

If 30cm³ of gas at 50°C is warmed to 80°C at a fixed pressure; the fractional increase in volume is?

A. 0.009 B. 0.093 C. 0.910 D. 1.090 Correct Answer: Option D = 1.090

5 years ago
The idea of planetary electron was that of?The idea of planetary electron was that of?

The idea of planetary electron was that of?

A. Rutherford B. Thompson C. Bohr D. Dalton Correct Answer: Option A - Rutherford

5 years ago
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