---
title: Which of the following statements most accurately characterises carb… — Gases all around: breath and balloons · tree and pragmatics
description: Which of the following statements most accurately characterises carbon monoxide? Exam question 3 of lesson 20 «Gases all around: breath and balloons» of the chemistry course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was right.
---

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# Exam question 3 · Gases all around: breath and balloons

<!-- .ven lang=en -->
Which of the following statements most accurately characterises carbon monoxide?

<!-- .vintro -->
**Mova's choice:** option 2 · **The right answer:** option 2 · right ✓ · **What happens:** follow, characteris · **To what, where:** carbon monoxide

<!-- .vabout -->
This is exam question 3 of lesson 20 «Gases all around: breath and balloons» of the chemistry course of Mova's primary school, asked in stiff, formal language. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/chemistry/20-gases-all-around-breath-and-balloons/#e3).

## The question {#question}

```conllu
# sent_id = question:chemistry:20-gases-all-around-breath-and-balloons:e3:1
# text = Which of the following statements most accurately characterises carbon monoxide?
1	Which	which	PRON	WDT	PronType=Rel	8	nsubj	_	_
2	of	of	ADP	IN	_	5	case	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
4	following	follow	VERB	VBG	VerbForm=Ger	5	amod	_	_
5	statements	statement	NOUN	NNS	Number=Plur	8	obl	_	_
6	most	most	ADV	RBS	Degree=Sup	7	advmod	_	_
7	accurately	accurately	ADV	RB	_	8	advmod	_	_
8	characterises	characteris	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
9	carbon	carbon	NOUN	NN	Number=Sing	10	compound	_	_
10	monoxide	monoxide	NOUN	NN	Number=Sing	8	obj	_	SpaceAfter=No
11	?	?	PUNCT	.	_	8	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **follow** | gerund |  |  |  |  |  |  | vn occur-48.3-1 «NP V»: agent=Theme |
| 2 | **characteris** | present |  | carbon monoxide |  |  |  | of the following statements; accurately *property* | tree rules |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

## The options {#options}

### Option 1 {#o1}

<!-- .ven lang=en -->
It possesses a strong odour of rotten eggs

```conllu
# sent_id = question:chemistry:20-gases-all-around-breath-and-balloons:e3:o1:1
# text = It possesses a strong odour of rotten eggs
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	possesses	possess	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
4	strong	strong	ADJ	JJ	Degree=Pos	5	amod	_	_
5	odour	odour	NOUN	NN	Number=Sing	2	obj	_	_
6	of	of	ADP	IN	_	8	case	_	_
7	rotten	rotten	ADJ	JJ	Degree=Pos	8	amod	_	_
8	eggs	egg	NOUN	NNS	Number=Plur	5	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **possess** | present | It | a strong odour of rotten eggs |  |  |  |  | vn own-100.1 «NP V NP»: agent=Pivot odour=Theme |

### Option 2 · ← Mova's choice · ✓ the right answer {#o2}

<!-- .ven lang=en -->
It is odourless and can prove fatal

```conllu
# sent_id = question:chemistry:20-gases-all-around-breath-and-balloons:e3:o2:1
# text = It is odourless and can prove fatal
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	3	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	cop	_	_
3	odourless	odourless	ADJ	JJ	Degree=Pos	0	root	_	_
4	and	and	CCONJ	CC	_	6	cc	_	_
5	can	can	AUX	MD	VerbForm=Fin	6	aux	_	_
6	prove	prove	VERB	VB	VerbForm=Inf	3	conj	_	_
7	fatal	fatal	ADJ	JJ	Degree=Pos	6	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | It |  |  |  |  | odourless *property* | tree rules |
| 2 | **prove** | can |  |  |  |  |  | fatal *property* | vn declare-29.4-1-1 «NP V what S\_INF»: agent=Agent |

### Option 3 {#o3}

<!-- .ven lang=en -->
It is visible as a white cloud

```conllu
# sent_id = question:chemistry:20-gases-all-around-breath-and-balloons:e3:o3:1
# text = It is visible as a white cloud
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	3	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	cop	_	_
3	visible	visible	ADJ	JJ	Degree=Pos	0	root	_	_
4	as	as	ADP	IN	_	7	case	_	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
6	white	white	ADJ	JJ	Degree=Pos	7	amod	_	_
7	cloud	cloud	NOUN	NN	Number=Sing	3	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | It |  |  |  |  | as a white cloud; visible *property* | tree rules |

### Option 4 {#o4}

<!-- .ven lang=en -->
It is entirely harmless in enclosed spaces

```conllu
# sent_id = question:chemistry:20-gases-all-around-breath-and-balloons:e3:o4:1
# text = It is entirely harmless in enclosed spaces
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	4	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	cop	_	_
3	entirely	entirely	ADV	RB	_	4	advmod	_	_
4	harmless	harmless	ADJ	JJ	Degree=Pos	0	root	_	_
5	in	in	ADP	IN	_	7	case	_	_
6	enclosed	enclose	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	7	amod	_	_
7	spaces	space	NOUN	NNS	Number=Plur	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | It |  |  | enclosed spaces |  | entirely, harmless *property* | tree rules |
| 2 | **enclose** | participle |  |  |  |  |  |  | vn contiguous\_location-47.8 «NP V NP»: agent=Theme |

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**Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License.

<!-- /div -->

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