MCQ
Silicon is an important constituent of
- ✓Rocks
- BAmalgams
- CChlorophyll
- DHaemoglobin
✓
Answer
Correct option: A.
Rocks
a
Silicon is an important constituent of rock in form of silica $SiO _2$.
Silicon is an important constituent of rock in form of silica $SiO _2$.
Amalgams contains $Hg$.
Haemoglobin contains iron.
Chlorophyll contains $Mg$.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
If one mole of a substance is present in $1\,kg$ of solvent, then
→Magnetic and spin quantum number of an electron are $-1$ and $+1/2$ respectively. This electron cannot be in
→Which one of the products of the following reactions does not react with Hinsburg reagent to form sulphonamide?
The substituents $R_1$ and $R_2$ for nine peptides are listed in the table given below. How many of these peptides are positively charged at $pH =7.0$ ? $Image$
→| Peptide | $R _1$ | $R _2$ |
| $I$ | $H$ | $H$ |
| $II$ | $H$ | $CH _3$ |
| $III$ | $CH _2 COOH$ | $H$ |
| $IV$ | $CH _2 CONH _2$ | $( CH _2)_4 NH _2$ |
| $V$ | $CH _2 CONH _2$ | $CH _2 CONH _2$ |
| $VI$ | $( CH _2)_4 NH _2$ | $( CH _2)_4 NH _2$ |
| $VII$ | $CH _2 COOH$ | $CH _2 CONH _2$ |
| $VIII$ | $CH _2 OH$ | $( CH _2)_4 NH _2$ |
| $IX$ | $( CH _2)_4 NH _2$ | $CH _3$ |
Racemic mixture is formed by mixing two
Given below are two statements :
Statement I : Nitrogen forms oxides with +1 to +5 oxidation states due to the formation of $\mathrm{p} \underline{\underline{\pi}}-\mathrm{p} \pi$ bond with oxygen.
Statement II : Nitrogen does not form halides with +5 oxidation state due to the absence of d-orbital in it.
In the light of given statements, choose the correct answer from the options given below.
→Statement I : Nitrogen forms oxides with +1 to +5 oxidation states due to the formation of $\mathrm{p} \underline{\underline{\pi}}-\mathrm{p} \pi$ bond with oxygen.
Statement II : Nitrogen does not form halides with +5 oxidation state due to the absence of d-orbital in it.
In the light of given statements, choose the correct answer from the options given below.
The angular momentum of an electron depends on
Number of isomeric primary amines obtained from ${C_4}{H_{11}}N$ are
→Aluminium chloride in acidified aqueous solution forms an ion having geometry
According to Molecular Orbital Theory,
→($A$) $\mathrm{C}_2^{2-}$ is expected to be diamagnetic
($B$) $\mathrm{O}_2{ }^{2+}$ is expected to have a longer bond length than $\mathrm{O}_2$
($C$) $\mathrm{N}_2^{+}$and $\mathrm{N}_2^{-}$have the same bond order
($D$) $\mathrm{He}_2^{+}$has the same energy as two isolated He atoms