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The element evolving two different gases on reaction with conc. $ H_2SO_4 $ is
$ C + 2H_2SO_4 \rightarrow CO_2 + 2H_2O + 2SO_2 $ Here carbon is oxidized to $ CO_2 \& H_2SO_4 is reduced to SO_2 $
Carborundum is obtained when silica is heated at high temperature with
Silica on heating with carbon at elevated temp gives carborandum (Silicon Carbide) $ SiO_2 + 3C \rightarrow [] { { \triangle } } SiC + 2CO_2 $ Carborandum is very hard substance
Lead pipes are corroded quickly by
Organic acids dissolve lead in presence of oxygen $ Pb + 2CH_3COOH + {1/2} O_2 \rightarrow Pb (CH_3COO)2 + H_2O $
Which is the correct oxidation state of lead
Lead (Pb) commonly exhibits +2 and +4 oxidation states. The +2 oxidation state is more stable for lead due to the inert pair effect, where the 6s electrons are less available for bonding. Thus, the correct oxidation states of lead are +2 and +4.
Quartz is an example of
Quartz is a three-dimensional network silicate. In quartz, each silicon atom is bonded to four oxygen atoms in a tetrahedral structure, forming a continuous three-dimensional network. This structure contributes to the hardness and stability of quartz.
Which of the following elements does not form stable diatomic molecules
Phosphorus does not form stable diatomic molecules. Instead, it exists in forms such as white phosphorus (P4) or red phosphorus, which are more stable. In contrast, iodine (I2), nitrogen (N2), and oxygen (O2) form stable diatomic molecules.
$ HNO_3 + P_2O_5 \rightarrow A + B $ , A is an Oxyacid of phosphorous and B is an oxide of N. A and B respectively are
The reaction between $HNO_3$ and $P_2O_5$ yields metaphosphoric acid ($HPO_3$) and dinitrogen pentoxide ($N_2O_5$). The balanced equation is: $HNO_3 + P_2O_5 ightarrow HPO_3 + N_2O_5$.
When heated $ NH_3$ is passed over CuO gas evolved is
When ammonia ($NH_3$) is passed over copper(II) oxide (CuO) and heated, nitrogen gas ($N_2$) is evolved. The reaction is: $2NH_3 + 3CuO ightarrow N_2 + 3Cu + 3H_2O$.
Which of the following has the highest dipole moment
Dipole moment is influenced by the difference in electronegativity between atoms and the molecular geometry. $ NH_3 $ (ammonia) has the highest dipole moment among the given hydrides because nitrogen is more electronegative than phosphorus, antimony, and arsenic, resulting in a larger separation of charge.
In an organic compound , phosphorous in estimated as
In an organic compound, phosphorus is often estimated as magnesium pyrophosphate ( ext{Mg}_2 ext{P}_2 ext{O}_7). This compound is formed during the process of phosphorus analysis, where the organic sample is typically combusted, and the phosphorus is precipitated and weighed as magnesium pyrophosphate.
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