CBSE
Multiple Choice QuestionsWhich of the following will form a colourless complex ?
Ni2+
Cu+
Ti2+
Fe3+
Assertion : K2Cr2O7 is used as primary standard in volumetric analysis.
Reason : It has a good solubility in water.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false.
Which is not stable under ambient condition?
Which belongs to the actinide series ?
Ce
Cf
Ca
Cs
Magnetic moment of Cr2+ is nearest to
Fe2+
Mn2+
Co2+
Ni2+
Brass, bronze and german silver have one common metal . This is :
Zn
Fe
Al
Cu
Assertion: Chemistry of actinoids is more complicated than lanthanoids.
Reason: Actinoid elements are radioactive.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
When calomel is treated with ammonium hydroxide, a black substance is formed. The black substance is
Hg + HgO
HgO.HgCl2
H2N-Hg-Cl+Hg
Hg(NH2)2 + HgO
The group of elements in which the differentiating electrons enters in the antepenultimate shell of atoms are called :
f - block elements
p - block elements
s - block elements
d - block elements
Assertion : Fe3+ can be used for coagulation of As2S3 sol.
Reason : Fe3+ reacts with As2S3 to give Fe2S3.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
