1
IAT (IISER) 2020
MCQ (Single Correct Answer)
+4
-1
A first-order reaction is found to have a half-life of one second (sec). What will be the time required for $99.9 \%$ completion of the reaction?
A
0.693 sec
B
2 sec
C
10 sec
D
69.3 sec
2
IAT (IISER) 2020
MCQ (Single Correct Answer)
+4
-1
The total number of nodes for a given principal quantum number $n$, and azimuthal quantum number $\ell$, are
A
sum of $\ell$ angular nodes and $n+\ell-1$ radial nodes
B
sum of $\ell$ angular nodes and $n-\ell-1$ radial nodes
C
sum of $\ell+1$ angular nodes and $n-\ell-1$ radial nodes
D
sum of $\ell+1$ angular nodes and $n+\ell-1$ radial nodes
3
IAT (IISER) 2020
MCQ (Single Correct Answer)
+4
-1
Which among the following is NOT correct?
A
$\mathrm{H}_3 \mathrm{PO}_4$ is a tribasic acid
B
$\mathrm{H}_3 \mathrm{PO}_3$ is a dibasic acid.
C
$\mathrm{H}_3 \mathrm{PO}_2$ is a monobasic acid.
D
$\mathrm{H}_3 \mathrm{PO}_2$ is a tribasic acid
4
IAT (IISER) 2020
MCQ (Single Correct Answer)
+4
-1
Which among the following is NOT correct regarding the first ionization potential $\left(\mathrm{IP}_1\right)$ of period $I I I$ elements $M g, A l, S i, P$ and $S$ ?
A
$P < S$
B
$A l < M g$
C
$A l < S i$
D
$S i < P$
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