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प्रश्न
Which among the following are physical or chemical change?
Heating of an iron rod to red hot
उत्तर
Physical
APPEARS IN
संबंधित प्रश्न
In the reaction represented by the equation:
MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
(i) name the substance oxidised.
(ii) name the oxidising agent.
(iii) name the substance reduced.
(iv) name the reducing agent.
Define reduction in terms of gain or loss of hydrogen with one example.
State, giving reason, whether the substances printed in bold letters have been oxidized or reduced.
Mg + 2HCl → MgCl2 + H2
State whether the following conversion is oxidation or reduction:
K → K+ + e-
Reacting with water, an active metal produces
Which of the following statements about hydrogen is incorrect?
Explain the term reduction in term of addition and removal of oxygen/hydrogen with a suitable example.
Identify the oxidising agent (oxidant) in the following reactions
`"V"_2"O"_5 + 5"Ca" -> 2"V" + 5"CaO"`
Identify the following reactions as oxidation/reduction/redox reaction
Zn + CuSO4 → Cu + ZnSO4
State the change in colour observed in following case mentioning the reason:
Copper powder is strongly heated in air.
