# Recent questions tagged 84

### What is X in the following reaction <br> $_{12}Mg^{26} + _1H^2 \to _{12}Mg^{27}$ + X$: ### Acetylene reacts with hypochlorous acid to form : ### The IUPAC name of$CH_3COCH(CH_3)_2$is : ### The oxidation states of$Cr$in$[Cr(H_2O)_6]Cl_3, [Cr(C_6H_6)_2]$, and$K_2[Cr(CN)_2(O)_2(O_2)(NH_3)]$respectively are : ### The radius of the second Bohr orbit for hydrogen atom is : <br> (Planck's constant$h= 6.6262 \times 10^{-34} Js$; mass of electron =$9.1091 \times 10^{-31} kg$; charge of electron$e = 1.60210 \times 10^{-19}C$; permittivity of vacuum$\in_0 = 8.854185 \times 10^{-12} kg^{-1}m^{-3}A^{2}$) ### If the line,$\frac{x-3}{2} = \frac{y+2}{-1} = \frac{z+4}{3}$lies in the plane,$lx + my - z =9$, then$l^2 + m^2$is equal to ### If the shortest distance between the lines$\frac{x-1}{\alpha} = \frac{y+1}{-1} = \frac{z}{1},\; (\alpha \neq -1)$and$x+y+z+1=0=2x-y+z+3$is$\frac{1}{\sqrt{3}}$, then a value of$\alpha$is : ### The major organic compound formed by the reaction of 1, 1, 1-trichloroethane with silver powder is : ### If a piece of metal is heated to temperature$\theta$and then allowed to cool in a room which is at temperature$\theta_0$the graph between the temperature T of the metal and time t will be closest to : ###$K_f$for water is$1.86 \;K\;mol^{-1}$. If your automobile radiator holds 1.0 kg of water, how many grams of ethylene glycol$(C_2H_6O_2)$must you add to get the freezing point of the solution lowered to$-2.8^{\circ}C$? ### A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at : ### Let$p(x)$be a function defined on$R$such that$p'(x) = p'(1-x)$, for all$x \in [0,1], \; p(0)=1$and$p(1) =41$. Then$\begin{align*} \int_0 ^1p(x) \; dx\end{align*}$equals ### Given$P(x) = x^4 + ax^3 + bx^2+cx+d$such that$x=0$is the only real root of$P'(x) = 0$. If$P(-1) < P(1)$, then in the interval$[-1, 1]$### The speed of sound in oxygen$(O_2)$at a certain temperature is$460 ms^{-1}$. The speed of sound in helium (He) at the same temperature will be (assumed both gases to be ideal) ### Consider the reaction, <br>$2A + B \to products$<br> When concentration of B alone was doubled, the half-life did not change. When the concentration of A alone was doubled, the rate increased by two times. The unit of rate constant for this reaction is : ### What products are expected from the disproportion reaction of hypochlorous acid ? ### Hydrogen bomb is based on the principle of : ### The formulation of the oxide ion$O^{2-} (g)$requires first an exothermic and then an endothermic step as shown below <br>$O(g) + e^-O^-(g) \Delta H^{\circ} = -142 \; kJ\; mol^{-1}$<br>$O^-(g) + e^-O^{2-} (g) \Delta H^{\circ} = 844\;kJ\; mol^{-1}$### The type of isomerism shown by the complex$[CoCl_2(en)_2]$is ### Presence of plants arranged into well defined vertical layers depending on their height can be seen best in : ### Specialised epidermal cells surrounding the guard cells are called - ### The wheat grain has an embryo with one large, shield-shaped cotyledon known as - ### What products are formed when the following compound is treated with$Br_2$in the presence of$FeBr_3$? <br> ###$6.02 \times 10^{20}$molecules of urea are present in$100\; mL$of its solution. The concentration of solution is- ### Bond order of 1.5 is shown by: ### Of the following complex ions, which is diamagnetic in nature ? ### During the kinetic study of the reaction,$2A+B\to C+D$following results were obtained:<br> <br>Based on the above data which one of the following is correct? ### The straight chain polymer is formed by – ### Kohlrausch's Law states that at : ### If$NaCl$is doped with$10^{-4}$mole % of$SrCl_2$, the concentrate of cation vacancies will be :$(N_A = 6.02 \times 10^{23}) mol^{-1}$### A solution of acetone is ethanol:- ### Which one of the following compounds is most acidic :- ### The radioactive isotope$^{60}_{27}Co$which is used in the treatment of cancer can be made by (n, p) reaction. For this reaction the target nucleus is :- ### According to IUPAC nomenclature sodium nitroprusside is named as : ### Zn gives$H_2$gas with$H_2SO_4$& HCl but not with$HNO_3$because :- ### Correct order of$I^{st}$IP among following elements Be, B, C, N, O is : - ### Which of the following element exhibit maximum oxidation state : ### Schottky defect shows : ### Telephone : Cable : : Radio : ? ### what is the central value of 3, 7 and 8? ### A snail can move a distance of 0.39 meters in 3 hours. What distance can it travel in ten hours? ### Find Principal when Time = 3 years, Interest = \$ 600; Rate = $4\%$ p.a.

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