MCQ
Statement “Ozone in atmosphere is decreased by chloro-fluoro-carbon $(C{l_2}{F_2}C)$”
- ✓Is true
- BIs false
- COnly in presence of $C{O_2}$
- DOnly in absence of $C{O_2}$
✓
Answer
Correct option: A.
Is true
a
It’s obvious.
It’s obvious.
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
$0.05 \mathrm{~cm}$ thick coating of silver is deposited on a plate of $0.05 \mathrm{~m}^2$ area. The number of silver atoms deposited on plate are__________ $\times 10^{23}$. (At mass Ag $\left.=108, \mathrm{~d}=7.9 \mathrm{~g} \mathrm{~cm}^{-3}\right)$
→A solution of a non electrolyte substance containing $1.05\,\, g$ per $100\,\, mL$, was found to be isotonic with $3\%$ glucose solution. The molecular mass of the substance is
→The reaction of an ester $RCOOR'$ with an alcohol $R''OH$ in the presence of an acid gives
→Which of the following reactions of glucose can be explained only by its cyclic structure?
Which of the following is not a correct statement for primary aliphatic amines?
If impurities can be oxidized more easily than the metal itself, which method is used?
Reaction of phenol with chloroform/sodium hydroxide to give $o$-hydroxy benzaldehyde involves the formation of
→Melting point of $FeCl_3$ and $FeCl_2$ is
→$2 NO +2 H _{2} \rightarrow N _{2}+2 H _{2} O$
→The above reaction has been studied at $800^{\circ} C$. The related data are given in the table below.
| Reaction serial number | Initial pressure of $H _{2}$ / $kPa$ | Initial Pressure of $NO /$ $kPa$ | Initial rate $\left(\frac{- dp }{ dt }\right) /( kPa / s )$ |
| $1$ | $65.6$ | $40.0$ | $0.135$ |
| $2$ | $65.6$ | $20.1$ | $0.033$ |
| $3$ | $38.6$ | $65.6$ | $0.214$ |
| $4$ | $19.2$ | $65.6$ | $0.106$ |
The order of the reaction with respect to $NO$ is $...........$
In a set of reactions $p-$ nitrotoluene yielded a product $E$. The product $E$ would be
→(Figure) $\xrightarrow[FeB{{r}_{3}}]{B{{r}_{2}}}B\xrightarrow{Sn\,/\,HCl}C$ $\xrightarrow[HCl]{NaN{{O}_{2}}}D\xrightarrow[HBr]{CuBr}E$