Correct

爆发 vs 发生

/ bàofā vs fāshēng /
Strokes

Definition

爆发 and 发生 both are Verbs, which means [erupt; happen].

Example

爆发 means "a sudden eruption of some emergency or a flare-up of some accumulated force".
In example ①, if suddenness is not stressed, 发生 can take the place of 爆发.
1
1911
1911
nián
  
,
zhōngguó
中国
bào
爆发
le
xīnhàimìng
辛亥革命
  

Xinhai Revolution (the Chinese bourgeois democratic revolution led by Dr. Sun Yatsen) took place in China in 1911.

2
Zhè
huǒshān
火山
bào
爆发
  
,
shìqián
事前
háishi
还是
yǒu
dìng
一定
xiàng
迹象
de
  

There were some signs before the erupting of the volcano.

3
shòudào
受到
刺激
  
,
qíng
情绪
xiàzi
一下子
bào
爆发
le
chūlái
出来
  

She burst out emotionally because of the stimulation.

4
Zhè
liǎng
rén
yuàn
积怨
jiǔ
  
,
zhōng
终于
bào
爆发
le
cháng
zhēngchǎo
争吵
  

A great deal of resentment has been incurred and finally a quarrel broke out between them.

发生 means "that sth. takes place or happens".
5
liǎn
脸色
cāngbái
苍白
  
,
shēng
发生
le
shénme
什么
shìqing
事情
  
?

You look pale, Whatsup?

6
tiáo
jiēshang
街上
shēng
发生
le
yánzhòng
严重
de
jiāotōng
交通
shì
事故
  

There was a severe traffic accident in that street.

7
Yòngyào
用药
zhīhòu
之后
  
,
奇迹
shēng
发生
le
  
,
xǐng
guòlái
过来
le
  

After the medicine was taken, the wonder worked,and he came round.