Chemistry

Which of the following resonance structure is lowest in energy?

 

How many hydrogen atom(s) is/are present in precipitate (P)?

Among the following oxides Cr₂O₃, V₂O₅, FeO, Mn₂O₇, ZnO, Cu₂O, MnO₂, CrO₃, NiO

If x = number of basic oxides

y = number of acidic oxides

z = number of amphoteric oxides

then the value of $\frac{\left(x+y\right)}{z}$  is

Consider the following orders given below.

(i) S > Se > Te > O (Electron Affinity)

(ii) $N^{-3}>O^{2-}>F^{-}>N{a}^{+}>M{g}^{2+}$  (Ionic Size)

(ii) Fe²⁺ > Fe³⁺ > Fe⁴⁺ (Ionization Enthalpy)

(iv) H < B < P < C < Cl (Electronegativity)

(v) Na⁺ < Mg²⁺ < Al³⁺ (Extent of hydration)

(vi) Li > Na > K > Rb > Cs (Reducing Nature)

(vii) LiF(s) > LiCl(s) > LiBr(s) (Lattice Energy)

If x = number of correct orders

y = number of incorrect orders

then the value of $\left(1+\frac{y}{x}\right)$  is.

A thin circular-disk earrings 10.0cm in diameter is plated with a coating of gold 0.20mm thick from an Au³⁺ bath. How many days (approx.) does it take to deposit the gold on one side of one earring if the current is 0.193 ampere.

Nitric oxide is formed in the combustion of fuel. An internal combustion engine produces 600 ppm (600 mg L^-1) of NO was oxidized to NO₂. The NO₂ formed was dissolved in 10L of water. The pH of the resulting solution is

(log 2 = 0.30, log 3 = 0.48)

A metal crystallises as simple cubic crystal. The distance between the nearest neighbours of each atom is $\frac{258.36}{\sqrt[]{2}}pm.$  The atomic radius of metal atoms (in pm) is

Find out the number of following orders which are INCORRECT against the mentioned properties:

(i) Ortho hydrogen > Para hydrogen (Stability at low temperature)

(ii) Ethanol > Glycerol (Viscosity)

(iii) D₂ < He (Boiling point)

(iv) HF > H₂O (Melting point)

(v) H₃BO₃ > BF₃ (Melting point)

(vi) NH₃ < SbH₃ (Boiling point)

(vii) H₂O₂ > H₂O (Strength of hydrogen bond)

(viii) H₂O < D₂O (Freezing point)

(ix) $H{F}_2^{\Theta }$  < HF (Strength of hydrogen bond)

(x) D₂O < H₂O (Bond energy)

How many H-atome can be exchanged by D-atom when the following compound is kept in $\stackrel{\Theta }{O}D/D_{2}O$  solution for long time?

The decomposition of hydrogen peroxide follows first order kinetics.

2H₂O₂(aq) $\stackrel{}{\to }$ 2H₂O $\left(\mathcal{l}\right)$ + O₂(g)

If the volume of O₂ gas liberated at S TP in first 2- minutes of the start of decomposition is 25.00ml, what should be the total volume of O₂ gas (in ml) collected in time, t >> T_1/2. (t_1/2 for the decomposition of H₂O₂ is 10 min)