Chemistry Questions

Q:

Which of the following is a micro nutrient?

A) Mg B) Cl
C) P D) Ca
 
Answer & Explanation Answer: B) Cl

Explanation:

The micronutrients (or trace minerals): boron (B), chlorine (Cl), manganese (Mn), iron (Fe), zinc (Zn), copper (Cu), molybdenum (Mo), nickel (Ni). and cobalt (Co).

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Q:

Chlorine gas is used in the manufacture of:

A) Baking powder B) Bleaching powder
C) Baking soda D) Washing soda
 
Answer & Explanation Answer: B) Bleaching powder

Explanation:
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Q:

Which equation represents a neutralization reaction?

A) 2Al(OH)3(s) ---> Al2O3(s) + 3H2O(l) B) H2SO4(aq) + 2NaOH(aq) ---> Na2SO4(aq) + 2H2O(l)
C) 2H2(g) + O2(g) ---> 2H2O(l) D) H2CO3(aq) ---> CO2(g) + H2O(l)
 
Answer & Explanation Answer: B) H2SO4(aq) + 2NaOH(aq) ---> Na2SO4(aq) + 2H2O(l)

Explanation:

Here in the option B) H2SO4 - Sulfuric acid is reacting with sodium hydroxide (NaOH), a base to produce a salt (Sodium Sulfate), and water (H2O). This is characteristic of of acid-base neutralization reactions.

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Q:

What element behaves most like magnesium?

A) Sr B) S
C) Si D) Sn
 
Answer & Explanation Answer: A) Sr

Explanation:

We know that, elements in the same group of the periodic table have similar characteristics. Here magnesium and strontium are the same 2nd group elements and have same behavior. 

Therefore, strontium behaves same as magnesium. 

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Q:

........... as is used as an illuminating gas.

A) Methyl B) Propane
C) Butene D) Ethyne
 
Answer & Explanation Answer: B) Propane

Explanation:
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Q:

The chemical name of common salt is

A) Calcium Chloride B) Potassium Chloride
C) Sodium Chloride D) Magnesium Chloride
 
Answer & Explanation Answer: C) Sodium Chloride

Explanation:

The chemical name of common is sodium chloride. Its chemical formula is NaCl.

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Q:

What temperature is considered freezing?

Answer

We have all been taught that water freezes at 32 degrees Fahrenheit, 0 degrees Celsius, 273.15 Kelvin. That's not always the case, though. Scientists have found liquid water as cold as -40 degrees F in clouds and even cooled water down to -42 degrees F in the lab.

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Q:

Which one of the following elements does not form solid hydrogen carbonate?

A) Sodium B) Potassium
C) Caesium D) Lithium
 
Answer & Explanation Answer: D) Lithium

Explanation:

Potassium bicarbonate (also known as potassium hydrogen carbonate or potassium acid carbonate) is the inorganic compound with the chemical formula KHCO3. It is a white solid

Sodium bicarbonate is a white solid that is crystalline, but often appears as a fine powder.

LiHCO3 is found in solution form while rest alkali metals hydrogen carbonates are solid due to the anomalous properties of Li and its diagonal relationship with the Mg.

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