List of top Chemistry Questions

In which case change in entropy is negative? (1)(2) (3 (4)

The most suitable reagent for the following conversion, is:

Which of the following is an amphoteric hydroxide?

For the chemical reaction \(N_2(g)+ 3H_2(g)= 2NH_3(g)\) the correct option is :

An alkene \("A"\) on reaction with \(O_3\) and \(Zn - H_2{0}\) given propanone and ethanol in equimolar ratio. Addition of \(HCI\) to alkene \("A"\) gives. \("B"\)as the major product. The structure of product \("B"\) is : 

Which is the correct thermal stability order for\( H_2E\) (E=O, S, Se, Te and Po)? 

Which will make basic buffer?

\(pH\) of a saturated solution of \(Ca(OH)_2\) is \(9\). The solubility product \((K_{sp})\) of \( Ca(OH)_2\) is: 

Which of the following species is not stable ?

The manganate and permanganate ions are tetrahedral, due to:

4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is:

For the cell reaction
\(2Fe^{3+}+2I^{-}_{(aq)}\rightarrow2Fe^{2+}+I_2{(aq)}\)
\(E^{\ominus}_{cell}=0.24\ V \ at \ 298 k.\)The standard Gibbs energy \((\Delta_rG^{\ominus})\) of the cell reaction is:
[Given that Faraday constant \( F=96500 \ C\ mol^{-1}]\)  

The value of x in the following chemical reaction is
\(C_3H_8 + xO_2 \rightarrow YCO_2 + zH_2O\)

Compounds with spin-only magnetic moment equivalent to five unpaired electrons are

The combining ratios of hydrogen and oxygen in water and hydrogen peroxide are $1 : 8$ and $1 : 16$ . Which law is illustrated in this example ?

If a metal crystallises in bcc structure with edge length of unit cell $4.29 \times 10^{-8}\, cm$ the radius of metal atom is

Which among the following is correct for electrolysis of brine solution ?

The temperature of $32^{\circ}C$ is equivalent to

"The mass and energy both are conserved in an isolated system", is the statement of

The number of pi-bonds present in benzoic acid molecule are

$9$ gram anhydrous oxalic acid (mol. wt. = $90$) was dissolved in $9.9$ moles of water. If vapour pressure of pure water is $p_{1}^\circ 1$ the vapour pressure of solution is

The elevation in boiling point of $0.25$ molal aqueous solution of a substance is $(K_b = 0.52\, K\, kg\, mol^{-1})$

Which of the following oxides can act both as an oxidising agent as well as reducing agent ?

The rule which describes the electron distribution in degenerate orbitals of an atom is

The possible I values for a given n value are