Download App

p -Block elements - ll — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
Holme's signals can be obtained by using
  • A
    $CaC_2 + CaCN_2$
  • ✓
    $CaC_2 + Ca_3P_2$
  • C
    $CaC_2 + CaCO_3$
  • D
    $Ca_3P_2 + CaCN_2$
✓

Answer

Correct option: B.
$CaC_2 + Ca_3P_2$
b
Holmes signal - A mixture of calcium carbide and calcium phosphide placed in a container which reacts with water to produce gases $\left( PH _3\right.$ and $\left.C _2 H _2\right)$ which burn and thus guide the ships in the sea.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from p -Block elements - ll→p -Block elements - ll — all question types→Chemistry STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

Configuration of $Yb^{+2}$ is
→
The atomic weight of $Fe$ is $56.$  The weight of $Fe$ deposited from $FeC{l_3}$ solution by passing $0.6$ Faraday of electricity is ............. $\mathrm{g}$
→
The coordination numbers of $Co$ and $Al$ in $[Co(Cl)(en)_2]Cl$ and $K_3[Al(C_2O_4)_3]$, respectively, are (en $=$ ethane $-1,2-$ diamine)
→
$Ph-N{{H}_{2}}\xrightarrow{C{{H}_{3}}Cl\,(2mole)}(A)\xrightarrow{Ph-\overset{\oplus }{\mathop{{{N}_{2}}}}\,\overline{Cl}}\underset{Butter\,yellow}{\mathop{(B)}}\,\,(major)$

Product of the above reaction is

→
If there be a compound of the formula $C{H_3}C{(OH)_3}$ which one of the following compounds would be obtained from it without reaction with any reagent
→
The empty space in $\text{hcp}$ and $\text{ccp}$ is about:
→
At a given temperature, the vapour pressure of a solution of two volatile liquids $A$ and $B$ is given by the equation $P_S = 150 -60$  $X_B (X_B =$ mole fraction of $B)$ Vapour  pressure of pure $A$ and $B$ at the same temperature are respectively :-
→
Detergents with branched hydrocarbon chains are less likely to be:
→
Which of the following reaction is an example of ammonolysis ?
→
Which of the following statements concern with transition metals ?
→