How can a farmer convert acidic soil to neutral soil?
Calcium phosphate is present in tooth enamel, its nature is
The acid present in curd is:
Why does tooth decay start when the pH of mouth is lower than 5.5 ?
Calcium phosphate is present in tooth enamel. Its nature is
Rain water with a pH less than 5.6 is called:
How does tooth enamel get damaged? What should be done to prevent it?
The acid present in tomato is:
The nature of the toothpaste commonly used is Acidic, Neutral, Basic, or baking soda?
(a) Explain the pH change as the cause of tooth decay. How can we prevent tooth decay caused by pH variations?
(b) Explain how pH change in the lake water can endanger the lives of aquatic animals (like fish). What can be done to lessen the danger to the lives of aquatic animals in the lake?
While playing in a park, a child was stung by a wasp. Some elders suggested applying the paste of baking soda and other lemon juice as the remedy. Which remedy do you think is appropriate and why?
- more than 9.6
- below 5.6
- sweet in taste
- acidic in nature
- basic in nature
- neutral in nature
- The teeth will be prone to decay due to sugar content of the drink.
- It will make the teeth black.
- It will erode the outer covering of teeth.
- All of these.
- When acid rain falls into the river, it lowers the pH of the river water.
- None of the above
- When acid rain falls into the river, it increases the pH of the river water.
- Acid rain does not cause any change in the river water.
(i) Why should we get our soil tested?
(ii) If soil has pH less than 7, how can we make it neutral?
(iii) What values are possessed by Dinesh?
A first aid manual suggests that vinegar should be used to treat wasp Sting and baking soda for bee stings.1 what does this information tell you about the chemical nature of the wasp Stings. 2. If there were no baking soda in the house, what other household substance could you use to treat bee stings?
Which of the following should be applied in the case of a wasp sting ?
- monsoon rain
- acid rain
- basic rain
- heavy rain
- none of the above