Which of the following reaction produces hydrogen ?
Mg + H2O
H2S2O8 + H2O
BaO2 + HCl
Na2O2 + 2HCl
Assertion: Stannous chloride gives a grey precipitate with mercuric chloride, but stannic chloride does not do so.
Reason: Stannous chloride is a powerful oxidising an agent which oxidises mercuric chloride to metallic mercury.
If both assertion and reason are true and the reason is a correct explanation of the assertion.
If both the assertion and reason are true but the reason is not a correct explanation of the assertion.
If the assertion is true but the reason is false.
If both the assertion and reason are false.
Assertion: Diamond is a bad conductor.
Reason: Graphite is a good conductor.
If both assertion and reason are true and reason is a correct explanation of the assertion.
If both the assertion and reason are true but the reason is not a correct explanation of the assertion.
If the assertion is true but the reason is false.
If both the assertion and reason are false.
Which of the following is not an ore of iron ?
Limonite
Caniterite
Magnetite
None of these
B.
Caniterite
Magnetite = Fe2O3
Limonite = FeO(OH)
Caniterite is not an iron ore.