MCQ
$.......$ metal generally occurs in free state.
- ASodium
- ✓Platinum
- CMagnesium
- DPotassium
✓
Answer
Correct option: B.
Platinum
Platinum is a chemical element with the symbol $Pt$ and atomic number $78.$ It is a dense, malleable, ductile, highly unreactive, precious, silverish$-$white transition metal. Since it is noble metal it is found in free state.
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
A compound with molecular mass $180$ is acylated with $CH_3COCl$ to get a compound with molecular mass $390.$ The number of amino groups present per molecule of the former compound is :
→Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
→Assertion $(A)$ : Haloalkanes react with $\mathrm{KCN}$ to form alkyl cyanides as a main product while with $\mathrm{AgCN}$ form isocyanide as the main product.
Reason $(R)$ : $\mathrm{KCN}$ and $\mathrm{AgCN}$ both are highly ionic compounds.
In the light of the above statement, choose the most appropriate answer from the options given below:
In the following compounds, the decreasing order of basic strength will be
When a solution of an electrolyte is heated the conductance of the solution
The cathode in the central compartment of Castner Kellner cell used for the manufacture of $\text{NaOH}$ is:
→A silver cup is plated with silver by passing $965 $ coulombs of electricity, the amount of silver deposited is ............. $\mathrm{g}$
→Two beakers $A$ and $B$ containing pure water and aqueous solution are shown. What will be observed gradually with passage of time ?
→In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula $\left[ Ag \left( NH _{3}\right)_{2}\right]^{+}$ per aldehyde group to form silver mirror is $......$. (Round off to the Nearest integer)
→Amino acids usually exist in the form of Zwitter ions. This means that it consists of
Elevation in boiling point for $1.5$ molal solution of glucose in water is $4 \,K$. The depression in freezing point for $4.5$ molal solution of glucose in water is $4\, K$ The ratio of molal elevation constant to molal depression constant $\left( K _{ b } / K _{ f }\right)$ is $....$
→