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प्रश्न
Classify the following as physical or chemical properties
Most metal oxides form alkalis on interacting with water.
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उत्तर
Chemical property
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
catalyst .
Complete and balance the following chemical equation:
\[\ce{Pb(NO3)2 ->[Heat]}\]
FILL IN THE BLANK
Positively charged ions are called ........
What do you observe when :
an iron nail is kept in tap water for few days
State the type of reactions for the following represent and balance the ones that are not balanced.
NaOH + HCl → NaCl + H2O
Name: A brown gas
Give examples of exothermic reactions i.e. heat evolved in each of the following:
(a) reaction between a solid and a liquid
(b) reaction between two gases
Give two examples of exothermic reactions seen in everyday life.
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 coloured substance which leaves on strong heating a black residue and evolves two colourless gases one of which is acidic and the other neutral.
Complete the table given below.
| Addition of dil. H2SO4 to zinc | Test for gas evolved |
Give an example where heat, light, and sound are produced during a chemical change.
