1
JEE Main 2020 (Online) 8th January Evening Slot
Numerical
+4
-0
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In the following sequence of reactions the maximum number of atoms present in molecule 'C' in one plane is _________. JEE Main 2020 (Online) 8th January Evening Slot Chemistry - Hydrocarbons Question 75 English (A is a lowest molecular weight alkyne)
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2
JEE Main 2020 (Online) 8th January Evening Slot
Numerical
+4
-0
Change Language
At constant volume, 4 mol of an ideal gas when heated from 300 K to 500K changes its internal energy by 5000 J. The molar heat capacity at constant volume is _______.
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3
JEE Main 2020 (Online) 8th January Evening Slot
Numerical
+4
-0
Change Language
Complexes (ML5) of metals Ni and Fe have ideal square pyramidal and trigonal bipyramidal grometries, respectively. The sum of the 90°, 120° and 180° L-M-L angles in the two complexes is ________.
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4
JEE Main 2020 (Online) 8th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
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Let $$\overrightarrow a = \widehat i - 2\widehat j + \widehat k$$ and $$\overrightarrow b = \widehat i - \widehat j + \widehat k$$ be two vectors. If $$\overrightarrow c $$ is a vector such that $$\overrightarrow b \times \overrightarrow c = \overrightarrow b \times \overrightarrow a $$ and $$\overrightarrow c .\overrightarrow a = 0$$, then $$\overrightarrow c .\overrightarrow b $$ is equal to
A
$$ - {1 \over 2}$$
B
$$ - {3 \over 2}$$
C
$${1 \over 2}$$
D
-1
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