Question
An atom with atomic number $21$ belongs to the category of
✓
Answer
c
$(c) d$-block - $[Ar]\,3{d^1}4{s^2}$
$(c) d$-block - $[Ar]\,3{d^1}4{s^2}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
$Y$ is
→Lower carboxylic acids are soluble in water due to
$0.2\, g$ of an organic compound was subjected to estimation of nitrogen by Dumas method in which volume of $N _{2}$ evolved (at STP) was found to be $22.400 \,mL$. The percentage of nitrogen in the compound is $.......$. [nearest integer] (Given: Molar mass of $N _{2}$ is $28\, mol ^{-1}$. Molar volume of $N _{2}$ at STP : $22.4\, L$ )
→How many spectral line of Balmer series present in visible region :
In Bohr’s model of atom when an electron jumps from $n =1$ to $n=3,$ how much energy will be absorbed
→The solubility product of $BaS{O_4}$ is $1.3 \times {10^{ - 9}}$. The solubility of this salt in pure water will be
→In Carius method of estimation of halogens, $250 \,mg$ of an organic compound gave $141 \,mg$ of $AgBr.$ The percentage of bromine in the compound is :
→(at. mass $Ag =108; Br = 80$)
In order to oxidise a mixture of one mole of each of $FeC _{2} O _{4}$ $Fe _{2}\left( C _{2} O _{4}\right)_{3}, FeSO _{4}$ and $Fe _{2}\left( SO _{4}\right)_{3}$ in acidic medium, the number of moles of $KMnO _{4}$ required is:
→The uncertainties in the velocities of two particles, $A$ and $B$ are $0.05$ and $0.02\, ms^{-1}$ respectively. The mass of $B$ is five times to that of the mass of $A$. What is the ratio of uncertainties $\frac{{\Delta {x_A}}}{{\Delta {x_B}}}$ in their positions ?
→In the following sequence of reactions,
→$C{H_3}C{H_2}C{H_2}Br$ $\xrightarrow{{KOH(alc.)}}\,(A)\,\xrightarrow{{HBr}}(B)\,$ $\xrightarrow{{KOH(aq.)}}(C)$ The product $(C)$ is