MCQ
Monazite is an ore of:
- ATitanium.
- BThroium.
- CZirconium.
- DIron.
Explanation:
Monazite is a prosphate material containing rare earth metals. It is reddish in colour. It is an important ore for throium, lanthanum, cerium.
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| Column$-I$ | Column$-II$ |
| $(a)$ $\mathrm{XeF}_{4}$ | $(i)$ pyramidal |
| $(b)$ $\mathrm{XeF}_{6} $ | $(ii)$ square planar |
| $(c)$ $\mathrm{XeOF}_{4}$ | $(iii)$ distorted octahedral |
| $(d)$ $\mathrm{XeO}_{3} $ | $(iv)$ square pyramidal |
code : $(a) \quad (b)\quad (c) \quad (d)$
Complete copolymerization of 500 moles of $Q$ and $500$ moles of $R$ gives one mole of a single acyclic copolymer $U$.
[Given, atomic mass: $H=1, C=12, O=16$ ]
($1$) Sum of number of oxygen atoms in $S$ and $T$ is. . . . . .
($2$) The molecular weight of $U$ is
Give the answer or quetion $(1)$ and $(2)$
Assertion $A :$ Dipole-dipole interactions are the only non-covalent interactions, resulting in hydrogen bond formation.
Reason $R$ : Fluorine is the most electronegative element and hydrogen bonds in $HF$ are symmetrical.
In the light of the above statements, choose the most appropriate answer from the options given below.