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When Borax is dissolved in water

Which of the following elements has the largest Van der Waals radii?

The mass of a photon with wavelength 3.6˚A is .

Germanium or silicon becomes extrinsic semi-conductor due to

Generally the ionization enthalpy in a period increases but there are some exceptions, the one which is not an exception is?

Terylene is a polyester of:

In which of the following compounds does the central atom violate the octet rule?

$(\text{Given: Atomic number},Se=34,As=33,B=5,N=7)$

The electron affinities of N, O, S, and Cl are such that

Phenol reacts with methyl chloroformate in the presence of $NaOH$ to form product A. A reacts with $B{r}_2$ to form product B. A and B respectively are:

In an irreversible process taking place at constant T and P and in which only PV work is being done, the change in free energy (dG) and change in entropy (dS) satisfy the criteria:

When 0 - hydroxybenzaldehyde is heated with ethanoic an hydride in presence sodium ethanoate, compound formed during the reaction is ?

Sort the following complexes according to their crystal field stabilization energy (CFSE)

Which of the following represents the correct order of filling the molecular orbitals of $B_2,C_2$ and $N_2$ ?

Which of the following can be termed as refining?

The decreasing order of reactivities of the following compounds towards electrophilic substitution is:

One mole of an ideal gas at ${25}^{\circ }C$ expands in volume from 1.0 L to 4.0 L at constant temperature. What work (in J) is done if the gas expands against vacuum ?

Which of the following carbocation is most stable?

Ethanol when reacted with PCl₅ gives A, POCl₃ and HCl. A reacts with silver nitrite to form B and AgCl . A and B respectively are

A crystalline hydrated salt on being rendered anhydrous loses 45.6% of its weight.

The percentage composition of the anhydrous salt is:

$Al=10.5\%,K=15.1\%,S=24.8\%$ and oxygen $=49.6\%$

[Molar mass of $Al=27,K=39,S=32$].



What is the empirical formula of the hydrated salt?

Which of the following is anti-aromatic in nature?

Hyperconjugation involves the overlapping of the following orbitals:

In a hydrogen atom, an electronic transition takes place from an initial state (1) to a final state (2). The difference in the orbit radius $(r_1-r_2)$ is 24 times the first Bohr radius. Identify the transition.

In the compound $C_6{H}_{5}Z$ which of the following has all predominantly ortho and para directing groups?

Number of chain isomers of $C_6{H}_{14}$ are:

Which one of the following polymers will not catch fire even at a high temperature of ${300}^{\circ }C$?

The base imidazole has $K_b$ of $1.0\times {10}^{-7}$. What volumes of 0.02 M HCl and 0.02 M imidazole should be mixed to make 150 mL of a buffer of pH 7 ?

Which of the following is an anionic detergent?

Which of the following does not show optical isomerism?

Consider the following complex ions:

$P,Q,$ and $R$. $P=[Fe{F}_6{]}^{3-},Q=[V(H_{2}O{)}_6{]}^{2+}$ and $R=\left[Fe\right(H_{2}O{)}_6{]}^{2+}$

The correct order of the complex ions, according to their spin only magnetic moment values (in BM) is:

Which of the following is largest?

Which order is correct for the decreasing reactivity to ring monobromination of the following compounds



$\underset{I}{C_6{H}_{5}C{H}_3},\underset{II}{C_6{H}_{5}COOH},\underset{III}{C_6{H}_6},\underset{IV}{C_6{H}_{5}N{O}_2}$

Which of the following gives paracetamol on acylation?

Which of the following oxides are basic?

The correct ground state electronic configuration of chromium atom is

The final product C obtained in this reaction is:

Which of the following can act both as Bronsted acid and Bronsted base

The kinetic energy of an electron is $4.55\times {10}^{-25}J$.The mass of electron is $9.1x{10}^{-31}\mathrm{kg}$ .The velocity of the electron is .

Match Column-I with Column-II:

$\begin{array}{cc}\text{Column-I}& \text{Column-II}\\ \text{a.}{\left[Ni\right(CN{)}_4]}^{2-}& \text{p.}{d}^{2}s{p}^3\\ \text{b.}\left[Ni\right(CO{)}_4]& \text{q.}s{p}^3{d}^2\\ \text{c.}{\left[Co\right(en{)}_3]}^{3+}& \text{r.}ds{p}^2\\ \text{d.}{\left[Co\right(Br{)}_{3}C{l}_3]}^{3-}& \text{s.}s{p}^3\\ & \text{t. Inner orbital complex}\\ & \text{u. Outer orbital complex}\end{array}$

What is the value of 4 days in seconds?

Determine the heat energy needed to increase the temperature of $5\text{mol}$ of mercury by $10\text{K}$. The value of heat capacity for given amount of mercury is $27.8{\text{J K}}^{-1}$

The pressure needed to confine 1.5 mol of $N_2$ molecules to 28 L flask is 1.0 bar. Thus, root mean square velocity of the gas (assuming ideal behaviour) is

If $21\text{g}$ of $NaHC{O}_3$ is added to $15\text{g}$ of $C{H}_{3}COOH$ solution, the residue is found to weigh $25\text{g}$. what is the mass of $C{O}_2$ is released in the reaction?