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Q:

Which of the following reactions are exothermic?

 

1)   C + O2  → CO22)  2Mg + O2  → 2MgO3)  CuSO4 + 5H2O  → CuSO4.5H2O4)  All the above

A) 1 B) 2
C) 3 D) 4

Answer:   D) 4



Explanation:

Here all the given options are Exothermic reactions. Exothermic reactions are those reactions which involves the release of heat.

 

Generally all the combining reactions are exothermic in nature.

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A colored ion generally indicates a

A) transition metal B) metalloid
C) large in size D) Both B & C
 
Answer & Explanation Answer: A) transition metal

Explanation:

A colored ion generally indicates a transition metal.

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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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Metal present in chocolate wrappers is

A) Aluminium B) Haemoglobin
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Answer & Explanation Answer: A) Aluminium

Explanation:

Metal Aluminium is present in chocolate wrappers.

metal_present_in_chocolate_wrappers1543390493.jpg image

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A yellow element that stinks when burned

A) Sulphur B) Chlorine
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Answer & Explanation Answer: A) Sulphur

Explanation:

Sulphur is an yellow element that stinks when burned.

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Glycolysis is the conversion of

A) Glucose to pyruvate B) Glucose to proteins
C) Pyruvate to glucose D) All of the above
 
Answer & Explanation Answer: A) Glucose to pyruvate

Explanation:

Glycolysis is the metabolic process of converting 1 molecule of glucose to 2 molecules of pyruvate through a series of 10 enzyme catalyzed reactions.

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An example of an extensive property of matter is

A) Volume B) Mass
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Answer & Explanation Answer: D) All the above

Explanation:

Any properties that are dependent on the amount of matter are called as extensive properties of matter.


Examples are :: Mass, Volume, Density (M/V),...

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Monopotassium tartarate was used in

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Answer & Explanation Answer: D) Baking

Explanation:

Monopotassium tartarate was used in baking powder.

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The element common to all acids is

A) Hydrogen B) Oxygen
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Answer & Explanation Answer: A) Hydrogen

Explanation:

Hydrogen is the common element in all acids.

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