The pair whose both species are used in antiacid medicinal preparation is
NaHCO3 and Mg(OH)2
Na2CO3 and Ca(HCO3)2
Ca(HCO3)2 and Mg(OH)2
Ca(OH)2 and NaHCO3.
The energy gaps (Eg) between valence band and conduction band for diamond, silicon and germanium are in the order
Eg (diamond) > Eg (silicon) > Eg (germanium)
Eg (diamond) <Eg (silicon) <Eg (germanium)
Eg (diamond) = Eg (silicon)= Eg (germanium)
Eg (diamond)> Eg (germanium)> Eg (silicon).
Among the following which one can have a meso form?
CH3CH(OH)CH(Cl)C2H5
CH3CH(OH)CH(OH)CH3
C2H5CH(OH)CH(OH)CH3
HOCH2CH(Cl)CH3
The major product obtained on the monobromination (with Br2/FeBr3) of the following compound A is
Assertion : [Co(NO2)3(NH3)3] does not show optical isomerism.
Reason : It has a plane of symmetry.
If both assertion and reason are true and reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true, but reason is false.
Both assertion and reason are false statements.
Assertion: Silicones are hydrophobic in nature.
Reason: Si-O- Si linkages are moisture sensitive.
If both assertion and reason are true and reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true, but reason is false.
Both assertion and reason are false statements.
C.
If assertion is true, but reason is false.
Silicones are strongly water repellent. Their water repellency arises because a silicone chain is surrounded by organic side groups and looks like an alkane from the outside.
Assertion: Diastereomers have different physical properties.
Reason : They are non-superimposable mirror images.
If both assertion and reason are true and reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true, but reason is false.
Both assertion and reason are false statements.
Assertion: The presence ofnitro group facilitates nucleophilic substitution reactions in aryl halides.
Reason: The intermediate carbanion is stabilised due to the presence of nitro group.
If both assertion and reason are true and reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true, but reason is false.
Both assertion and reason are false statements.