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Wrought iron is obtained by heating cast iron in a furnace with?

A. magnetite B. haematite C. carbon(ii)oxide D. calcium trioxosilicate(iv) Correct Answer: Option B - haematite Explanation Cast iron + haematite…

3 years ago

Which of the following best represent solid gas mixture?

A. milk B. kerosene C. soil D. smoke Correct Answer: Option D - smoke Explanation Solid in gas mixture: Smoke,…

3 years ago

Calculate the value of ΔS if the heat change in the in system is 400J at -273ºC

A. 40J/K B. 400J/K C. 4J/K D. 0.4J/K Correct Answer: Option B = 400J/K

3 years ago

The dehydration of CH3CH2CH2CH2OH will give?

A. HC≡CCH2CH3 B. CH2≡CH2CH3 C. CH3C≡CCH3 D. CH3CH≡CHCH3 Correct Answer: Option D - CH3CH≡CHCH3 Explanation An alkene is produced when…

3 years ago

The pollutant usually presents in a city which generates its electricity from coal?

A. fog B. carbon(ii)oxide C. smog D. sulphur(iv)oxide Correct Answer: Option B - carbon(ii)oxide Explanation The most common source of…

3 years ago

The reactions below represent neutralization reaction; in which of them is the value of ΔH highest?

A. CH3CH2COOH + KOH → CH3CH2COOK + H2O B. NH4OH + HCl → NH4 + H2O C. NaOH + HCl…

3 years ago

If the volume of a given mass of a gas at 0ºc is 29.5cm³ what will be the volume of the gas at 15ºc; the pressure remaining constant

A. 31.6 B. 62.2 C. 32.7 D. 31.1 Correct Answer: Option D = 31.1 Explanation Charles' law is a special…

3 years ago

In which of the following will hydrogen form ionic compound?

A. HCl B. NaH C. NH3 D. CH4 Correct Answer: Option B - NaH Explanation NaH is a saline (salt-like)…

3 years ago

2H2 + O2 → 2H2O: From this equation; calculate the volume of unreacted oxygen gas if a mixture of 50cm3 of hydrogen and 75cm3 of oxygen are involved

A. 85cm3 B. 50cm3 C. 125cm3 D. 55cm3 Correct Answer: Option B - 50cm3 Explanation Since 2 mol H2 reacted…

3 years ago

An organic compound contains 69% carbon; 15.3% hydrogen and 30.7% oxygen. Calculate the the empirical formula [C=12, H = 1, O = 16]

A. C4H12O B. C3H9O C. C4H8O D. C3H8O Correct Answer: Option D - C3H8O Explanation C = 69/12; H =…

3 years ago