List of top Chemistry Questions

The method used to remove temporary hardness of water is : (1) (2) (3) (4)

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

For the second period elements the correct increasing order of first ionisation enthalpy is :

Match the Xenon compounds in Column-I with its structure in Column II and assign the correct code:

Column I		Column II
A	\(XeF_4\)	I	pyramidall
B	\(XeFe_6 \)	II	square planar
C	\(XeOF_4  \)	III	distorted octahedral
D	\(XeO_3\)	IV	square pyramidal

Code:

Identify the incorrect statement related to PCI from the following:

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 : 

The correct structure of tribromooctaoxide is:

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

A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is :

The most suitable reagent for the following conversion, is:

Which of the following is an amphoteric hydroxide?

Which will make basic buffer?

What is the correct electronic configuration of the central atom in \(K_4[Fe(CN)_6]\) based on crystal field theory?

Which one is malachite from the following?

Which of the following species is not stable ?

The manganate and permanganate ions are tetrahedral, due to:

Among the following, the one that is not a green house gas is

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

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

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

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