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Bases generate hydroxide__________ ions in water.
Bases generate hydroxide ions or OH- ions in water. Thus option C is correct
'Litmus', a natural dye, is an extract of which of the following?
The acid present in the body of a red ant is
Carbon dioxide reacts with calcium hydroxide to form calcium carbonate and water. Ca(OH)2 + CO2 → CaCO3 + O. This reaction is known as
It is an example of a neutralization reaction in which an acid (carbon dioxide) reacts with base (calcium hydroxide) to form salt and water.
Which of the following is known as soda ash?
Assertion: Metal Oxides react with acids to form salt and water.
Reason: Most of the metal oxides are acidic in nature.
Metal oxides react with acid to form salt and water because most of the metal oxides are basic or amphoteric in nature.
Some alkali metal salts are coloured Na2CrO4 —yellow, KMnO4- pink, K2MnO4 -green. It is due to:
An aqueous solution of NaCl is:
Which of the following is a natural indicator?
Non-metals + acids
When sodium hydroxide reacts with aluminium metal:
2NaOH + 2Al + 2H2O ⇨ 2NaAlO2 + 2H2
Sodium chloride is known as:
Molten sodium chloride conducts electric current due to the presence of:
Which two metals react with concentrated alkalis?
The pH of a compound is found to be 9. The compound can be:
To protect tooth decay, we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is:
Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the
When an alkali or alkaline earth metal (or its salt) is introduced in the flame, the metal's valence electrons absorb energy and are excited to the higher energy level. When excited electrons return to their ground state, they release the absorbed energy as visible light.
Aqueous solution of sodium chloride turns
Aqueous solution of NaCl is neutral and therefore, does not change the colour of either red or blue litmus.
A milkman added a small pinch of baking soda to fresh milk which had pH close to 6. As a result, pH of the medium