Advertisements
Advertisements
प्रश्न
Write the missing reactants and products and balance the equations.
NaOH + ............... `→` NaCI + ...................
Advertisements
उत्तर
NaOH + HCI `→` NaCI + `H_2O`
APPEARS IN
संबंधित प्रश्न
How would you show that setting of curd is a chemical change?
FILL IN THE BLANK
In a double decomposition precipitation reaction both the reactants must be ............ soluble.
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
Name three reducing agents ?
State what you would observe when the following substance is heated in a glass test tube red lead.
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)
Electron ______ is complete in each hydrogen in a hydrogen molecule.
Write the chemical reaction where the following changes are observed.
Colour change is noticed
Name: Gas with rotten egg smell.
What do you observe when Cobalt chloride paper is introduced in water vapour.
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 dilute hydrochloric acid to silver nitrate.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc carbonate to zinc oxide
Complete the table given below.
| Heat on sodium chloride | Colour imparted to flame during flame test |
What happens when cane sugar is strongly heated? Mention any two changes in it.
Chemical change is a temporary change.
Water boiling into water vapour is an example of chemical change.
The water we drink is a combination of hydrogen and oxygen.
Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood
State whether the following statement is true or false:
When a candle burns, both physical and chemical changes take place.
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.
What changes do you expect?
Rusting of iron is ______.
