Science (Acids Bases And Salts)

Out of these gases which one is used in fire extinguishers

• SO2

• CO2

• NO2

• H2O

Products of a neutralisation reaction are always:

• Salts and water

• Acid and Bases

• Acid and water

• Bases and Water

Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed.

• Yellow in both acid and base

• Yellow in acid and red in base

• Pink in acid and yellow in base

• Red in acid and blue in base

Tags

NGSS.MS-PS1-2

Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are:

• red and blue

• blue and red

• pink and colourless

• colourless and pink

When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?

• Organic matter

• Quick lime

• Calamine solution

• Slaked lime

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

The correct way of making a solution of acid in water is to

• add water to acid

• add acid to water

• mix acid and water simultaneously

• add water to acid in a shallow container.

‘Litmus’, a natural dye is an extract of which of the following?

• China rose (Gudhal)

• Beetroot

• Lichen

• Blueberries

A neutralisation reaction is a

• physical and reversible change.

• physical change that cannot be reversed

• chemical and reversible change.

• the chemical change that cannot be reversed.

Tags

NGSS.MS-PS1-2

On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?

• (a) Basic

• (b) Either acidic or basic

• (c) Either acidic or neutral

• (d) Either basic or neutral

Consider The Following Sentences And Choose The Correct Statements:

• Tartaric acid present in unripe mangoes.

• [B]. Formic acid present in ant sting.

• [C]. Lactic acid present in curd.

  .

• [D]. All the above