Acid Bases and Salts

Ammonia is found in many hoousehold products, such as window cleaners.It turns red litmus blue.What is its nature?
1. Acidic
2. Basic
3. Neutal
4. Indicator
Which of the following is a neutralization reaction?
1. HCl + NaOH -> NaCl + water
2. carbon dioxide + lime water -> calcium carbonte + water
3. water + carbon dioxide -> carbonic acid
4. none of these
Which solution is applied on the skin when an ant bites?
1. Acetic acid
2. Litmus
3. Calamine
4. Phenolphthalein
Which of the following statement is/are true for acids?
1. They are sour in taste.
2. They turn blue litmus paper or slution red.
3. Dilution of acid in water is an exothermic reaction.
4. all of these
Which of the following are natural indicators?
1. Turmeric
2. China rose petals
3. Litmus
4. All of these
What is the colour of litmus in distilled water?
1. Purple
2. Red
3. Blue
4. Orange
An oxide is acidic and has a pungent odour.it could be
1. Sulphur dioxide
2. Carbon dioxide
3. Sodium oxide
4. Nitrogen dioxide
When the soil is too basic, plants donot grow well in it. To improve its quality what must be added to the soil?(NCERT Examplar)
1. Organic matter
2. Quick lime
3. Slaked lime
4. Calamine solution
On adding phenolphthalein indicator to a colourless solution, no change is observed.What is the nature of this solution?(NCERT Examplar)
1. Basic
2. either acidic or basic
3. either acidic or neutral
4. either basic or neutral
Out of these gases which one is the used in fire extinguishers.
1. carbon dioxide
2. sulphur dioxide
3. nitrogen dioxide
4. none of these