Assertion : Graphite is an example of tetragonal crystal system.

Reason : For a tetragonal system, a = b $\ne$ c, $\mathrm{\alpha }$=$\mathrm{\beta }$= 90°,$\mathrm{\gamma }$= 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.

Assertion: For the Daniel cell, Zn/Zn²⁺||Cu²⁺|Cu with E_cell= 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.

43.

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$\mathrm{\nu }$; H₂O

• SOCl₂ ; alc. KOH.

lsopropyl benzene on air oxidation in the presence of dilute acid gives

• C₆H₅COOH

• C₆H₅COCH₃

• C₆H₅CHO

• C₆H₅OH.

The following sequence of reactions on A gives