railway RRB JE (CBT I + CBT II) Mock Test 2024 General Science Chemistry Equilibrium

The substances with pH less than 7 are:

1. Gastric juices

2. Coffee

3. Apple juice

4. Liquid in the car battery

1
1 and 2 only
2
1, 3 and 4 only
3
1, 2 and 3 only
4
All of these
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