Assertion $(A)$: Alkali metals are soft and have low melting and boiling points.
Reason $(R)$: This is because interatomic bonds are weak.

  • A
    Both $(A)$ and $(R)$ are not true
  • B
    $(A)$ is true but $(R)$ is not the correct explanation of $(A)$
  • C
    $(A)$ is true but $(R)$ is false
  • D
    Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A)$

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Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$ :- Sodium is about $30$ times as abundant as potassium in the oceans.
Reason $R$ :- Potassium is bigger in size than sodium.
In the light of the above statements,choose the correct answer from the options given below:

What is the formula of calcium cyanamide?

$A$ metal $M$ reacts with $N_2$ to form a compound $A$ $(M_3N)$. Heating $A$ at high temperature gives back $M$,and passing $A$ through $H_2O$ produces gas $B$. Gas $B$ turns $CuSO_4$ solution into a deep blue color. What are $A$ and $B$?

Which of the following carbonates of a metal has least thermal stability?

The elements of group $IA$ provide a colour to the flame of a Bunsen burner due to

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