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8 g of a metal hydroxide on heating produces 5 g of metal oxide. If the atomic mass of the metal is 7, the formula of its chloride is

The
existence of a substance in more than one solid modifications is known as

or Any compound having more
than two crystal structures is called

[MP PMT 1993; MP PET 1999]

Calculate Molarity of a solution having $2.6\times {10}^{-3}$ mole solute dissolved in 250 ml solution.

Arrange in increasing order of basicity,

$H_{2}O,O{H}^{-},C{H}_{3}OH,C{H}_3{O}^{-}$

Propanal on treatment with dilute sodium hydroxide gives:

The concentration of a reactant changes from .03M to .02M in 25 minutes. The average rate of reaction, using time in seconds is

Identify the major product:

One litre of $O_2$ at NTP reacts with 3 times the volume of CO at NTP. Calculate volume of $C{O}_2$ formed.

Why are different colours observed in octahedral and tetrahedral complexes for the same metal and same ligands?

A radioactive isotope, having a half life of $3$ days was received after $9$ days. It was found that there was only $4\text{gms}$ of the isotope left in the container. The initial weight of the isotope, when it was packed, must be,

Write reactions of the final alkylation product of aniline with an excess of methyl iodide in the presence of sodium carbonate solution.

Comprehension:
The elements of group 1 describe, more clearly than any other group of elements, the effects of increasing the size of atoms or ions on the physical and chemical properties. The chemical and physical properties of the elements are closely related to their electronic structures and sizes. These metals are highly electropositive and thus form very strong bases, and have quite stable oxo-salts. In the manufacturing of sodium hydroxide, chlorine and sodium carbonate, the sodium chloride is used as starting material.

Which of the following acts as an oxidising as well as reducing agent ?

In a set of reactions acetic acid yielded a product D

Can chemical composition come under physical properties

Dry
distillation of barium salt of Hexane-1,2- dicarboxylic acid gives:

A gas occupies $56\text{L}$ at 1 atm and $273\text{K}$. Find the number of moles of the gas:

Total number of isomers of a disubstituted benzene compound is

The type of hybridisation of boron in diborane is
(a) sp (b) $s{p}^2$ (c) $s{p}^3$ (d) $ds{p}^2$

Two communicating vessels contains mercury. The diameter of one vessel is $n$ times larger than the diameter of other. A column of water of height $h$ is poured into the left vessel. The mercury level that will rise in the right hand vessel is ($s$ = relative density of mercury and $\rho$ = density of water)