Advertisements
Advertisements
प्रश्न
Give reason .
A person suffering from acidity is advised to take an antacid.
Advertisements
उत्तर
An antacid neutralizes stomach acidity.
APPEARS IN
संबंधित प्रश्न
The chemical name of baking soda is ______.
Write the missing reactants and products and balance the equations.
NaOH + ............... `→` NaCI + ...................
TRUE \ FALSE
Weak electrolytes dissociate partially in their aqueous or fused state.
What do you observe when :
an iron nail is kept in tap water for few days
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
The white particles of baking soda disappear when put in lemon juice. This means that it is a ______ change.
Explain by writing a word equation.
Limestone powder disappears on adding to dilute hydrochloric acids.
Define the following term:
Precipitate
Write your observation and a balanced equation in the case of the following substances being heated.
Zinc carbonate.
Select the correct answer for the following options:
The gas obtained when potassium chlorate is heated in the presence of a catalyst.
Give reason for the following:
Even though rusting is an exothermic reaction, the heat evolved when an iron nail rusts is unnoticeable.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of water to quicklime.
State the following reaction represent oxidation or reduction.
\[\ce{Ag->Ag+}\]
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
What happens when cane sugar is strongly heated? Mention any two changes in it.
True or False. If false, give the correct answer.
Taking a glass of water and freezing it by placing it in the freezer is a chemical change.
A reaction between an acid and a base is called ______.
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Write a word equation for the chemical change, if any.
Which is used as a catalyst during the process of hydrogenation of oils?
Write five changes in the characteristics of a substance that can take place during a chemical change.
Acid rain is a result of ______.
