List of top Questions asked in KEAM

The halogen compound which will not react with phenol to give ethers is

The elution sequence of a mixture of compounds containing chlorobenzene, anthracene and p-cresol developed on an alumina column using a solvent system of progressively increasing polarity is

Which of the following compounds are aromatic?

Aromatic electrophilic substitution reaction that is reversible is

Phenylacetylene on treatment with \(HgSO_4/H_2SO_4, H_2O\) produces

Which one of the following statements is false ?

Number of constitutional isomers of alkane with formula $C_6H_{14}$ is

The effective nuclear charge of an element with three valence electrons is 2.60. What is the atomic number of the element?

More than four bonds are made by how many elements in carbon family?

How many peroxy linkages are present in \(CrO_5\)?

Consider the following compounds
1. \((NH_4)_2Cr_2O_7\) 2. \(NH_4NO_2\) 3. \(NH_4VO_3\) 4. \(NH_4NO_3\)
Which compound(s) yield nitrogen gas upon heating?

When \(H_2O_2\) is added to an acidified \(K_2Cr_2O_7\) solution

Select the correct option(s) for the following statements
1. \(Cl_2O\) and \(ClO_2\) are used as bleaching agents
2. \(OCl^-\) salts are used as detergents
3. \(OCl^-\) disproportionates in alkaline medium
4. \(BrO_3^-\) is oxidized in acidic medium
Which of the following combination is correct?

Consider the following statements concerning $N_2H_4$
1. It is an exothermic compound
2. It burns in air with the evolution of heat
3. It has kinetic stability
4. It reduces $Fe^{3+}$ to $Fe^{2+}$ in acidic medium
Which of the following combination is correct?

When \(SO_2\) gas is passed into aqueous \(Na_2CO_3\) the product(s) formed is(are)

Portland cement does not contain

\(Al_2(SO_4)_3\) is used in the following but not

Maximum number of covalent bonds formed by N and P are

Consider the following species
1. $[O_2]^{2-}$ 2. $[CO]^+$ 3. $[O_2]^+$
Among these sigma bond alone is present in

An alternating voltage $V=V_0\sin\omega t$ is applied across a circuit and as a result, a current $I=I_0\sin\left(\omega t+\frac{\pi}{2}\right)$ flows in it. The power consumed per cycle is

An electromagnetic wave of intensity $I$ is incident on a non-reflecting surface. If $C$ is the speed of light in free space, then, the ratio $\frac{I}{C}$ is same as

Which element has the highest first ionization potential?

Which statement(s) is(are) false for the periodic classification of elements?

Gd(64) has __________ unpaired electrons with sum of spin __________

The electronegativities of N, C, Si and P are in the order