Chemistry (UI) | Study Mode

Question 41

0.16g of methane when burnt increases the temperature of 100g of water by 40^o (C) , what is the heat of combustion of methane if the heat capacity of water is 4.2 Jg^-10C^-1 ? (CH₄=16).

1,160kJmol^-1

1,180kJmol^-1

1,560kJmol^-1

1,600kJmol^-1

1,680kJmol^-1

Explanation

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Correct option: E

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Question 42

A charged car battery has ___ energy that can be converted into another energy called ___ energy

Chemical, electrical

mechanical, chemical

heat, mechanical

light, electrical

light, heat

Explanation

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Correct option: A

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Question 43

Copper oxide is heated with charcoal to produce carbon monoxide and copper. The reaction is an example of

both oxidation and reduction

neither oxidation and reduction

oxidation only

reduction only

neutralization

Explanation

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Correct option: A

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Question 44

For each oxygen atom in hydrogen peroxide which acts as an oxidant, there is an oxygen atom which acts as a /an

Oxidant

reductant

oxidizing agent

catalyst

inhibitor

Explanation

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Correct option: B

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Question 45

Given the change of phase: CO₂ (g) changes to CO₂ (s), the entropy of the system

decreases

increases

remains the same

Stabilizes

Explanation

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Correct option: A

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Question 46

In which of the following is the entropy change positive?

Reaction between an acid and a base.

Addition of concentrated acid to water.

Dissolution of sodium metal in water.

Thermal dissociation of ammonium chloride.

Explanation

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Correct option: C

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Question 47

One of these elements is the best reducing agent.

Explanation

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Correct option: B

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Question 48

The name of the gas driven off at the negative electrode during the electrolysis of brine is ___

hydrogen

chlorine

oxygen

sodium

hydrogen chloride

Explanation

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Correct option: B

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Question 49

The oxidation state of P in H₂P₂O₇^2- is ___

-3

-2

Explanation

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Correct option: D

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Question 50

The oxidation state of S in Ca(HSO₃)₂ is __

-2

-4

Explanation

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Correct option: C

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