List of top Chemistry Questions on Some basic concepts of chemistry asked in NEET (UG)

Which pair have not equal dimensions:

Volume of \(CO_2\) obtained by the complete decomposition of \(9.85\ gm \ BaCO_3\) is:

The number of atoms in 4.25 g of $NH_3$ is approximately

Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200 g. The number of iron atoms (at. weight of Fe is 56) present in one molecule of haemoglobin are

In the reaction, $4NH_3 (g) + 5O_2 \rightarrow 4NO(g) + 6H_2O (I)$ When 1 mole of ammonia and 1 mole of $O_2$ are made to react to completion, then

0.24 g of a volatile gas, upon vaporisation, gives 45 mL vapour at NTP. What will be the vapour density of the substance ? (Density of $ H_2 = 0.089$)

The total number of valence electrons in 4.2 g of $N_3^{-}$ ion is [$N_A$ is the Avogadro's number)

A $5$ molar solution of $H_2SO_4$ is diluted from 1 litre to a volume of 10 litres, the normality of the solution will be

Boron has two stable isotopes, $^{10}B (19 \%)$ and $ ^{11}B (81\%)$. Calculate average atomic weight of boron in the periodic table.

A metal oxide has the formula $M_2O_3$. It can be reduced by $H_2$ to give free metal and water. $0.1596\, g$ of $M_2O_3$ required 6 mg of $H_2$ for complete reduction. The atomic mass of the metal is

The number of oxygen atoms in $4.4\, g$ of $CO_2$ is,

1 cc $N_2O$ at NTP contains

At STP, the density of $CCl_4$ vapour in g/L will be nearest to

One litre hard water contains 12.00 mg $Mg^{2+}$. Milliequivalents of washing soda required to remove its hardness is