Assertion : Graphite is an example of tetragonal crystal system.
Reason : For a tetragonal system, a = b c, == 90°,= 120°
If both assertion and reason are true but reason is not 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.
D.
Both assertion and reason are false statements.
Graphite has a two dimensional sheet structure. Each C-atom is in sp2 hybridised state and is linked to three other carbon atoms in a hexagonal planar structure.
For a tetragonal system,
For a hexagonal system, .
Assertion: For the Daniel cell, Zn/Zn2+||Cu2+|Cu with Ecell= 1.1V, application of opposite potential greater than 1.1 V results into flow of electron from cathode to anode.
Reason : Zn is deposited at anode and Cu is dissolved at cathode.
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 : 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 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 : If red blood cells were removed from the body and placed in pure water, pressure inside the cells increases.
Reason : The concentration of salt content in the cells increases.
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 : Change in colour of acidic solution of potassium dichromate by breath is used to test drunk driver.
Reason : Change in colour is due to the complexation of alcohol with potassium di chromate.
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 water pouch of instant cold pack for treating athletic injuries breaks when squeezed and NH4NO3 dissolves lowering the temperature.
Reason : Addition of non-volatile solute into solvent results into depression of freezing point of solvent.
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.
The pair in which both species have iron is
nitrogenase, cytochromes
carboxypeptidase, haemoglobin
haemocyanin, nitrogenase
haemoglobin, cytochromes
Which of the following sequence of reactions (reagents) can be used for the conversion of C6H5CH2CH3 into C6H5CH=CH2?
SOCl2 ; H2O
SO2Cl2; alc. KOH
Cl/h; H2O
SOCl2 ; alc. KOH.
lsopropyl benzene on air oxidation in the presence of dilute acid gives
C6H5COOH
C6H5COCH3
C6H5CHO
C6H5OH.