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.
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.
Explore more
Similar questions
The value of current required to deposit $0.972\, gm$ of chromium in $3$ hours if the $E.C.E.$ of chromium is $0.00018\, gm$ per coulomb, is ............ $\mathrm{amp}$
→In the form of dichromate, Cr(VI) is a strong oxidising agent in acidic medium but Mo (VI) in MoO3 and W(VI) in WO3 are not because ___________.
Mole fraction $(X)$ of any solution is equal to
→Which of the following is a carbohydrate
Which of the following alcohol is not present in the mixture containing major products. Product mixture.
In the reaction,
→$BrO_{3(aq)}^ - \, + \,5Br_{(aq)}^ - \, + \,6{H^ - }\, \to \,3B{r_{2(l)}}\, + \,3{H_2}{o_{(l)}}.$
The rate of appearance of bromine $(Br_2)$ is related to rate of disappearance of bromide ions as
${E^o}$ values of $M{g^{2 + }}/Mg$ is $ - 2.37\,V$, of $Z{n^{2 + }}/Zn$ is $ - 0.76\,V$ and $F{e^{2 + }}/Fe$ is $ - 0.44\,V$. Which of the following statements is correct
→Match List $I$ with List $II$
→| LIST-$I$ | LIST-$I$ |
| $A$.Glucose/NaHCO3/$\Delta$ | $I$.Gluconic acid |
| $B$.Glucose/HNO3 | $II$. No reaction |
| $C$.Glucose/HI/ $\Delta$ | $III$. n-hexane |
| $D$. Glucose/Bromine [water] | $IV$. Saccharic acid |
Choose the correct answer from the options given below:
Which of the following alkyl halides will undergo SN1 reaction most readily?
When ${I_2}$ is dissolved in $CC{l_4}$, the colour that results is
→