Which of the following reactions are exothermic? | Chemistry Questions & Answers

Q:

_______________ of a material is defined as the minimum amount of the work necessary to remove a free electron from the surface of the material.

A) The electro-repulsive force	B) The coulomb factor
C) The power factor	D) The work function

Answer & Explanation Answer: D) The work function

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Q:

Atomic number of which of the following elements is greater than that of Zinc

A) Copper	B) Iron
C) Chromium	D) Bromine

Answer & Explanation Answer: D) Bromine

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Q:

Which of the following statements about the reaction below are INCORRECT?

$2 Pb + C \to 2 Pb + {CO}_{2}$

A. Carbon di-oxide is getting, oxidised
B. Lead is getting reduced
C. Carbon is oxidised
D. Lead oxide is getting reduced

A) A and C	B) A and B
C) B and C	D) A, B and C

Answer & Explanation Answer: B) A and B

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Q:

A solution contains 33 g of common salt in 320 g of water. Calculate the concentration in terms of mass, by mass percentage of the solution.

A) 13.05%	B) 9.09 g
C) 9.35g	D) 9.35%

Answer & Explanation Answer: D) 9.35%

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Q:

............ element is represented by the given symbol.

A) Hydrogen	B) Mercury
C) Carbon	D) Gold

Answer & Explanation Answer: B) Mercury

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Q:

Calculate the relative molecular mass of water $H_{2} O$ ?

A) 18u	B) 1.8u
C) 2.0u	D) 20u

Answer & Explanation Answer: A) 18u

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Q:

Potassium Permanganate is used for purifying drinking water, because________

A) It is a reducing agent	B) It is an oxidising agent
C) It is a sterilising agent	D) It dissolves the impurities of water

Answer & Explanation Answer: B) It is an oxidising agent

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Q:

Which is the only non-metal placed at the left side of the Modern Periodic Table?

A) Hydrogen	B) Carbon
C) Neon	D) Helium

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

Which of the following reactions are exothermic?

$1) C + O_{2} \to {CO}_{2} 2) 2 Mg + O_{2} \to 2 MgO 3) {CuSO}_{4} + 5 H_{2} O \to {CuSO}_{4} . 5 H_{2} O 4) All the above$

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Which of the following reactions are exothermic? 1) C + O2 → CO22) 2Mg + O2 → 2MgO3) CuSO4 + 5H2O → CuSO4.5H2O4) All the above

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Which of the following reactions are exothermic?

$1) C + O_{2} \to {CO}_{2} 2) 2 Mg + O_{2} \to 2 MgO 3) {CuSO}_{4} + 5 H_{2} O \to {CuSO}_{4} . 5 H_{2} O 4) All the above$