Advertisements
Advertisements
प्रश्न
Complete the table given below.
| Addition of dil. H2SO4 to zinc | Test for gas evolved |
उत्तर
| Addition of dil. H2SO4 to zinc | Test for gas evolved | The gas [H2] evolved burns with 'pop' sound and burns with pale blue flame |
APPEARS IN
संबंधित प्रश्न
When carbon dioxide is passed through lime water, it turns milky due to the formation of ______.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
TRUE \ FALSE
Temperature at which a liquid starts boiling is known as the boiling point of that liquid. True or false ?
A chemical equation is a statement that describes a chemical change in terms of
State four conditions necessary for a chemical reaction to take place.
Name the type of chemical reaction shown by the following equation :
Fe2O3 + 2Al → Al2O3 + 2Fe
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)
Oxygen is a ______ in respiration.
Write the chemical reaction where the following changes are observed.
Gas is evolved
Write the chemical reaction where the following changes are observed.
Colour change is noticed
What do you observe? When
Sodium chloride solution is added to silver nitrate solution.
Name the gases which Turn moist red litmus blue.
Write your observation and a balanced equation in the case of the following substances being heated.
Copper carbonate.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A white solid which evolves two colourless gases which on cooling combine and condense on the cooler parts of the test tube.
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
A reaction between an acid and a base is called ______.
Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.
What is the use of indicator?
Is the conversion of milk into ice cream a chemical change?
Explain how the painting of an iron gate prevents it from rusting.
Chemical changes are important in our day-to-day life. Give examples.
