Ncert Solutions Chemistry Class 11th

At $25°C$  and 1 atm pressure, the enthalpies of combustion are as given below:

The enthalpy of formation of ethane is

In a compound AOH, electronegativity of ' A' is 2.1, the compound would be

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

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)

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)

The only INCORRECT information is

If Q is a colourless gas with rotten fish smell then select CORRECT statement.

The compressibility factor of a Vanderwaal gas is 0.5 at $27°C$  and 24 atm. The value of Vanderwaal constant 'a' (in atm-L²/mol²) is (b = 0.10 L/mol, R = 0.08 L-atm/K-mol)

Consider the following reactions of 1A metals.

M + $\left(x+y\right)N{H}_3$ $\stackrel{}{\to }{\left[M{\left(N{H}_3\right)}_x\right]}^{+}+{\left[e{\left(N{H}_3\right)}_y\right]}^{-}$  

$M_{\left(am\right)}^{+}+e^{-}+N{H}_3\left(\mathcal{l}\right)\stackrel{}{\to }MN{H}_{2\left(am\right)}+\frac{1}{2}{H}_2\left(g\right)$

Which of the following statement is

INCORRECT?

In the above diagram if a systems from initial state A (P₁,V_1,T₁) goes to final state C (P₂ ,V₂ ,T₁) from 3 different paths: Path 1 is A to C, Path 2 is A to B to C, Path 3 is A to D to C If 5 kJ of work is done by system in Path A to C then how much heat is transferred during Path A to D is: