Acids, bases and salts class 7 ncert

The chemical nature of acid is ________ in nature

• Basic

• Red

• Blue

• Acidic

Which of the following is a base

• Baking soda

• Curd

• Orange juice

• Vinegar

Which of the following is a natural indicator

• Phenolphthalein

• Turmeric

• Salt

• Vinegar

What is the color of lichens in distilled water

• Blue

• Mauve (purple)

• Red

• Orange

From where is litmus extracted

(a)  

Which color of litmus papers are available these days in strips

• Mauve(purple)

• Red

• Green

• Blue

Which type of acid is found in ant's sting

• Lactic acid

• Oxalic acid

• Formic acid

• Acetic acid

Which type of base is found in window cleaner

• Calcium hydroxide

• Sodium hydroxide

• Ammonium hydroxide

• Magnesium hydroxide

The solutions which don't change color of either blue or red litmus are called (a)   solutions

When added to an acidic solution, ___litmus paper turns ___

• Red ; blue

• Blue ; red

• Red; orange

• Blue ; green