IGCSE Chemistry: Specimen Questions with Answers 50 - 52 of 240

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Question 50

Question

MCQ▾

Group I metals are also known as the Alkali Metals.

Which statement about the metals in Group I is not correct?

Choices

Choice (4)

a.

In their reactions they lose electrons

b.

Their atoms all have one electron in their outer shell.

c.

They form ions in their reactions with nonmetals.

d.

They form covalent compounds by sharing electrons.

Answer

d.

Explanation

Correct option is D because alkali metal never forms covalent compound by sharing electrons because alkali metal always donate electron to form + ve ion. In the outer shell of alkali metals it have one electrons. As shown in figure.

Alkali Metals

Question 51

Question

MCQ▾

Which element is a transition metal?

Choices

Choice (4)

a.

Table of Transition Metal: Choice A

b.

Table of Transition Metal: Choice B

c.

Table of Transition Metal: Choice C

d.

Table of Transition Metal: Choice D

Answer

d.

Explanation

Correct option is D because nickel is a transition metal and have melting point of element and color of its chloride is yellow.

Question 52

Edit

Write in Short

Short Answer▾

The alkanes are a homologous series of hydrocarbons. Alkanes can be cracked to form alkenes and smaller alkanes. State the conditions needed for cracking. (2 marks)

Explanation

Cracking is the breakdown of a large alkane into smaller, more useful alkanes and alkenes. Simply put, hydrocarbon cracking is the process of breaking a long-chain of hydrocarbons into short ones. This process might require high temperatures and high pressure. As shown in the diagram:

Condition to Crack Alkanes

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