MCQ
Which of the following statement is wrong
- ✓No inert gas is present in $7^{th}$ period
- B$3^{rd}$ period contains $18$ elements
- C$1^{st}$ period contains two non metals
- DIn $p-$ block, metal, nonmetal and metalloids are present
✓
Answer
Correct option: A.
No inert gas is present in $7^{th}$ period
a
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
Which of the following pairs of compound are not isomers ?
The high boiling point of ethanol $({78.2\,^o}C)$ compared to dimethyl ether$( - {23.6\,^o}C)$, though both having the same molecular formulae ${C_6}{H_6}O$, is due to
→The increasing order of stability of the following free radicals is
The correct order in aqueous medium of basic strength in case of methyl substituted amines is :
Relation between $(B)$ and $(C)$ is
→$C{H_3} - C \equiv C - H\xrightarrow{{NaN{H_2}}}\xrightarrow{{C{H_3} - I}}(A)\xrightarrow{{Li/liq\,N{H_2}}}(B)$
$C{H_3} - C \equiv C - H\xrightarrow{{NaN{H_2}}}\xrightarrow{{C{H_3} - I}}(A)\xrightarrow[{Pd.CaC{O_3}}]{{{H_2}}}(C)$
The alkaline hydrolysis of ethyl acetate is represented by the equation$C{H_3}COO{C_2}{H_5} + NaOH \to C{H_3}COONa + {C_2}{H_5}OH$ Experimentally it is found that for this reaction$\frac{{dx}}{{dt}} = k[C{H_3}COO{C_2}{H_5}]\,[NaOH]$ Then the reaction is
→The energy required to break one mole of $Cl- Cl$ bonds in $Cl_2$ is $242\, kJ \,mol^{- 1}.$ The longest wavelength of light capable of breaking a single $Cl - Cl$ bond is ............ $\mathrm{nm}$
→$(C= 3 \times 10^8 \,ms^{-1}$ and $N_A =6.02 \times mol^{-1}).$
Which of the following carbocation is most stable?
$N{a_2}{B_4}{O_7}.10{H_2}O \xrightarrow{\Delta } X + NaB{O_2} + {H_2}O$
→$X + C{r_2}{O_3}\xrightarrow{\Delta }Y$ (Green coloured)
$X$ and $Y$ are
The plot given below shows $P - T$ curves (where $P$ is the pressure and $T$ is the temperature) for two solvents $X$ and $Y$ and isomolal solutions of $NaCl$ in these solvents. $NaCl$ completely dissociates in both the solvents.
→On addition of equal number of moles of a non-volatile solute $S$ in equal amount (in $kg$ ) of these solvents, the elevation of boiling point of solvent $X$ is three times that of solvent $Y$. Solute $S$ is known to undergo dimerization in these solvents. If the degree of dimerization is $0.7$ in solvent $Y$, the degree of dimerization in solvent $X$ is. . . . . . .