$CATEGORY: Science - Khan Academy/2.Acids, Bases and Salts/2.Acids, Bases and Salts--More About Salts

//Multiple Choice

Litmus solution is extracted from\:
{
~ Blueberries
= Lichen
~ Turmeric
~ Beetroot
}

Litmus solution is used to test\:
{
~ Temperature
= Acidity or basicity
~ Electrical conductivity
~ Hardness of water
}

In acidic solutions, blue litmus paper turns\:
{
= Red
~ Green
~ Yellow
~ No change
}

In basic solutions, red litmus paper turns\:
{
~ Green
= Blue
~ Yellow
~ No change
}

What is the color of litmus in a neutral solution?
{
~ Red
~ Blue
= Purple
~ Yellow
}

//True or False

Litmus is a synthetic indicator. {F}

Red litmus paper turns blue in a basic solution. {T}

Litmus solution shows no color change in a neutral solution. {F}

Blue litmus paper remains blue in a basic solution. {T}

Litmus solution can detect both acidic and basic solutions. {T}

//Fill in the blanks

Litmus is a natural indicator extracted from __________.
{
~ Turmeric
= Lichen
~ Hibiscus
}

In an acidic solution, litmus paper turns __________.
{
~ Blue
~ Green
= Red
}

In a basic solution, red litmus paper turns __________.
{
~ Yellow
= Blue
~ Green
}

Litmus solution is commonly used to identify __________ substances.
{
~ Organic
= Acidic and Basic
~ Neutral
}

Neutral substances, such as distilled water, __________ the color of litmus paper.
{
= Do not change
~ Turn red
~ Turn blue
}

The natural source of litmus is a __________.
{
~ Flower
~ Fungi
= Lichen
}

A solution that turns blue litmus red is __________ in nature.
{
= Acidic
~ Basic
~ Neutral
}

A solution that does not affect the color of litmus paper is __________.
{
= Neutral
~ Acidic
~ Basic
}

Litmus is available in the form of __________ and __________.
{
= Paper; Solution
~ Powder; Crystal
~ Tablet; Gel
}

Litmus solution is prepared by dissolving the extract of lichen in __________.
{
~ Alcohol
= Distilled water
~ Vinegar
}

//Numericals



//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Red litmus in acid -> No change
=Red litmus in base -> Blue
=Blue litmus in acid -> Red
=Blue litmus in base -> No change
=Neutral solution -> Purple
}


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