JEE MAIN 2022 ONLINE 24TH JUNE EVENING SHIFT
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Which of the following chemical reactions represents Hall-Heroult Process?
A Carnot engine takes 5000 kcal of heat from a reservoir at 727\(^\circ\)C and gives heat to a sink at 127\(^\circ\)C. The work done by the engine is
The number of solutions of the equation
\(\cos \left( {x + {\pi \over 3}} \right)\cos \left( {{\pi \over 3} - x} \right) = {1 \over 4}{\cos ^2}2x\), \(x \in [ - 3\pi ,3\pi ]\) is :
Which one of the following compounds is used as a chemical in certain type of fire extinguishers?
In an experiment to verify Newton's law of cooling, a graph is plotted between the temperature difference (\(\Delta\)T) of the water and surroundings and time as shown in figure. The initial temperature of water is taken as 80\(^\circ\)C. The value of t2 as mentioned in the graph will be __________.

Consider the following statements:
A : Rishi is a judge.
B : Rishi is honest.
C : Rishi is not arrogant.
The negation of the statement "if Rishi is a judge and he is not arrogant, then he is honest" is