At a certain temperature, $\mathrm{T}(\mathrm{K})$, during a process, 500 J is absorbed by the system and work of 200 J is done by the system. Then change in internal energy of the system is :
400 J
300 J
700 J
500 J
For a certain reaction $R \rightarrow$ Product, the plot of concentration $[R]$ vs time has a negative slope as shown. The order of reaction is :

0
1
2
2.5
Identify the correct statement about $\mathrm{CIF}_3$ from the following options :
It has T-shaped geometry with two lone pairs on Cl atom.
It has T-shaped geometry with three lone pairs on Cl atom.
It has a trigonal pyramidal geometry with two lone pairs on Cl atom.
It has a planar trigonal geometry with two lone pairs on Cl atom.
In a test tube containing a salt, a few drops of dilute $\mathrm{H}_2 \mathrm{SO}_4$ was added, which gave colourless vapours having the smell of vinegar. The vapours turned the blue litmus paper red.
Identify the correct anion from the following :
Sulphide, $\mathrm{S}^{2-}$
Sulphate, $\mathrm{SO}_4^{2-}$
Acetate, $\mathrm{CH}_3 \mathrm{COO}^{-}$
Carbonate, $\mathrm{CO}_3^{2-}$
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