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Reaction of ammonia with diborane gives an ionic product $$\text{B}_2\text{H}_6 \cdot 2\text{NH}_3$$. The hybridization of boron in the cation and anion of this product are respectively
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Reaction of ammonia with diborane gives an ionic product $$\text{B}_2\text{H}_6 \cdot 2\text{NH}_3$$. The hybridization of boron in the cation and anion of this product are respectively
A sequence of reactions of phosphorus $$\text{P}_4$$ is given below. The correct set of products Q, R, S and T among the following is
In the gaseous state of $$\text{Fe(CO)}_5$$, the d orbital that would participate in hybridization is
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Among the following, the correct statements about p block elements are
I. The valence shell electronic configuration of all of them is $$ns^2 np^{1-6}$$
II. Only in p block, metals, nonmetals and metalloids are present
III. Halogens have the lowest negative electron gain enthalpy in the respective periods
IV. Noble gases have no tendency to accept an electron and hence they have large negative values of electron gain enthalpy
A chemical reaction is carried out at two different temperatures $$T_1$$ and $$T_2$$ with $$T_2 > T_1$$, and also with and without a catalyst. The statement that is correct among the following is
The product P in the following sequence of reactions is
Among the following, maximum number of resonance structures is possible for
A mixture of sodium (Na) and potassium (K) metals weighing 32 g was reacted with water and the solution obtained could be neutralized with 517.3 mL of 1.0 M $$\text{H}_2\text{SO}_4$$ (aq). The mass of sodium that was present in the mixture is
The mass ratio of steam and hydrogen is found to be $$1 \colon 1.5$$ at equilibrium in the reaction $$3\text{Fe}(s) + 4\text{H}_2\text{O}(g) \rightleftharpoons \text{Fe}_3\text{O}_4(s) + 4\text{H}_2(g)$$. The value of the equilibrium constant $$K_c$$ of the above reaction is
Two students did a set of experiments on ketones X and Y independently and obtained the following results.
The ketones X and Y are respectively
Glycine $$\text{C}_2\text{H}_5\text{O}_2\text{N}$$ is the simplest of amino acids. Molecular formula of the linear oligomer synthesized by linking ten glycine molecules together via a condensation reaction would be
If $$\text{Ni}^{2+}$$ is replaced by $$\text{Pt}^{2+}$$ in the complex ion $$[\text{NiCl}_2\text{Br}_2]^{2-}$$, which of the following would change? I. Magnetic moment II. Geometry III. Geometrical isomerism IV. Optical isomerism
An inorganic compound X of an alkali metal on heating gives a reddish-brown gas Y and a binary solid Z. This solid is less soluble in water and its solution is basic. X does not give a positive silver nitrate test. X can be identified as
The qualitative plots given represent the yield of the product [XY] at equilibrium in the reaction $$\text{X}(g) + \text{Y}(g) \rightleftharpoons \text{XY}(g)$$ as a function of temperature, at total pressures $$P_1$$ and $$P_2$$. The reaction is
When 6.8 g of $$\text{AgNO}_3$$ completely reacts with $$\text{H}_3\text{PO}_2$$, the metallic silver produced in g and the $$\text{H}_3\text{PO}_2$$ consumed in mole are respectively
Lovastatin, a drug used to reduce the risk of cardio vascular diseases, has the following structure.
The number of stereogenic centers present in lovastatin is
Among the following sets, the one in which all the molecules are non polar is
Gas phase reactions (i) and (ii) are of first and second order respectively, where
(i) is $$2\text{N}_2\text{O}_5 \rightarrow 4\text{NO}_2 + \text{O}_2$$ and
(ii) is $$2\text{NO} + \text{O}_2 \rightarrow 2\text{NO}_2$$.
Under certain conditions the rate constants $$k_1$$ and $$k_2$$ of (i) and (ii) respectively have the same numerical value when the concentrations of the reactants are expressed in mol $$\text{dm}^{-3}$$. If the concentrations are expressed in mol $$\text{mL}^{-1}$$, the correct relationship between $$k_1$$ and $$k_2$$ is
The correct sequence of reactions to get Q as the only product from P is
The Galvanic cell can be represented as Zn / $$\text{Zn}^{2+}$$ (0.1 M) // $$\text{Cu}^{2+}$$ (0.1 M) / Cu.Among the following, the cell among the following that can produce an EMF more than that of this Galvanic cell is
($$E^\circ$$ of $$\text{Zn}^{2+}/\text{Zn}$$ and $$\text{Cu}^{2+}/\text{Cu}$$ are $$-0.763$$ V and 0.337 V respectively)
The correct match of the molecules in column I and reactions in column II
While doing a titration, a student recorded a burette reading of 10.0 mL for the neutralization of 10.0 mL $$\text{NaHC}_2\text{O}_4$$ (aq) with 0.1 M NaOH (aq). In a separate experiment, 10.0 mL of this $$\text{NaHC}_2\text{O}_4$$ (aq) solution could be completely oxidized by 10.0 mL of $$\text{KMnO}_4$$ in an acidic medium. What would be the molarity of $$\text{KMnO}_4$$ used by this student?
Pheromones are chemicals that animals produce for social response. The structure of brevicomin, a pheromone, is shown below. The open chain ketodiol that would form brevicomin is
The best reagents and conditions to accomplish the following conversion is
The correct statements among the following are
Which of the following aqueous solutions will have a pH value between 4.0 and 5.0 at $$25^\circ\text{C}$$?
The energy required to remove an electron from a gaseous species X to form $$\text{X}^+$$ is known as the first ionization energy (IE) of X, the energy required to remove an electron from $$\text{X}^+$$ to form $$\text{X}^{++}$$ is the second IE of X, and similarly the energy required to remove an electron from $$\text{X}^-$$ to form X is called the IE of $$\text{X}^-$$. Identify the correct statements from the following
The products formed in the following reaction are
Which of the following options are correct?
Nitromethane undergoes an aldol type reaction with a racemic mixture of 2-methylcyclohexanone in presence of aqueous NaOH in two steps I and II to give the product P. The statements NOT correct among the following are
The structures of hydrogen peroxide $$\text{H}_2\text{O}_2$$ in the solid and gaseous states are given below. Liquid $$\text{H}_2\text{O}_2$$ is slightly more viscous than liquid $$\text{H}_2\text{O}$$. The correct options among the following are
Viruses are nonliving complex chemical entities. They undergo inactivation and hence lose the ability to infect a host, with time. Concentration, (expressed as median tissue culture infectious dose TCID/ml, a unit used in expressing virus concentrations) vs. time plots of a corona virus on the surfaces of a paper currency note and a plastic currency note are shown below. Both these plots have two separate regions, shown by vertical lines in the plots, indicating two time zones.
The correct options among the following are
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