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Radius of the following species follows the order

$H^{+},H,H{e}^{+}\text{\&}H{e}^{+2}$

Benzaldehyde cannot be prepared by which of the following reactions?

In C, N, O and F the electronegativity

Which of the following is butyl radical?

When $I^{-}$ is oxidized by $Mn{O}_4^{-}$ in faintly alkaline medium, $I^{-}$ is convered into ?

An alkene on ozonolysis gives methanal as one of the products. Its sturcture is:

Which is a pair of geometrical isomers?

I. II.

III. IV.

In $P_4$ molecule phosphorus atoms are tetrahedrally arranged. The bond angle P-P-P in the molecule is

Which of the following has the highest reducing nature among the following?

$A{s}_2{O}_3,B{i}_2{O}_3,A{s}_2{O}_5,B{i}_2{O}_5$

What is the basis of long form of periodic table?

The species which react(s) with silica/glass in presence of moisture :

Fringe width observed in the Young's double-slit experiment is $\beta$ . If the frequency of the source is doubled, the fringe width will

Which one of the following gives the most stable diazonium salt?

The ionization constant of $HF,HCOOH$ and $HCN$ at $298K$ are $6.8\times {10}^{-4},1.8\times {10}^{-4}\text{and}4.8\times {10}^{-9}$ respectively. The ionization constants of the corresponding conjugate bases, respectively are:

The aqeous solution of the following salt will have the lowest pH:

What is the solubility of $Al(OH{)}_3,(K_{sp}=1\times {10}^{-33})$ in a buffer solution of $pH=4$ ?

Which one of the following electrolytes has the same value of van't Hoff factor $\left(i\right)$ as that of $K_{4}Fe(CN{)}_6$ (if all are 100% ionised)?

Which of the following is not the product of dehydration of ?