List of top Chemistry Questions

One gas bleaches the colour of flowers by reduction and another gas by oxidation. The gases respectivelyare
One can obtain a silica garden if
On the basis of structure, the oxidation of two Cl atoms in $CaOCl_2$ respectively are
On the basis of structure, the two sulphur atoms in $ {Na_2S_2O_3}$ have
One among the following is an example of ferroelectric compound. It is
On hydrolysis, diborane produces
On passing 3 ampere of electricity for 50 minutes,1.8 g of metal deposits. The equivalent mass ofmetal is
On sulphonation phenol gives two products, ortho and para phenol sulphonic acids. The variation in products depend upon
On heating, lead nitrate forms oxides of nitrogen and lead. The oxides formed are__________ .
On heating ozone, its volume
On heating a mixture of $NH_4Cl\, and\, KNO_2$, we get
On heating ammonium dichromate and barium azide separately we get
On dissolving sugar in water at room temperature solution feels cool to touch. Under which of the following cases dissolution of sugar will be most rapid?
On being placed in water, sodium peroxide not only produces an alkaline solution but also some bubbles. If we assume that the peroxide ion picks up two protons from water to produce a compound that can be seen as the dibasic conjugate acid of peroxide ion and then this compound undergoes a redox disproportionation. $Na_{2}O_{2\left(s\right)}+H_{2}O_{\left(\ell\right)} \rightarrow\left(A\right)+\left(B\right) \left(A\right) \, and \, \left(B\right) are$
On addition of small amount of $KMnO_4$ to concentrated $H_2SO_4$, a green oily compound is obtained which is highly explosive in nature. Identify the compound from the following.
On addition of one mL solution of 10% NaCl to 10 mL gold solution in the presence of 0.025 g of starch, the coagulation is prevented because starch has the following gold numbers
Oleum is chemically known as
Of the three molecules $XeF_4, SF_4 ,SiF_4$ one which have tetrahedral structures is
Of the following, the most stable hydride is
Of the group 13 elements, the element with lowest electronegativity is
Of the following which is a step growth polymer
Of the following a pair of isotopes is
Octane number is zero for
Nylon-66 is obtained from
Number of unit cells in 4 g of X (atomic mass = 40) which crystallises in bcc pattern is iNA - Avogadro number)