Chemistry Test - 1

C₂H_4(g) + 3 O_2(g)→2 CO_2(g) + 2 H₂O₍₎

At 300 K ΔH = − 336.2 kcal

Δn_g = 2 − (1 + 3) = − 2

T = 300 K, ΔH = − 336.2 kcal,

R = 2 × 10⁻³ kcal degree⁻¹ mol⁻¹

ΔH = ΔU+ Δn_gRT

− 336.2 = ΔU + (− 2) × 300 × 2 × 10⁻³

ΔU = − 336.2 + 1.2 = − 335.0 kcal.

Hence option B is correct.

Hence option B is correct.

\begin{equation}\begin{aligned}
&CaSO _{4(aq )}+ BaCl _{2( aq )} \rightarrow BaSO _{4( s )}+ CaCl _{2( aq )}\\
&136 g \text { CaSO }_{4} \text { produces } 233 g \text { BaSO }_{4}\\
&\text { Weight of } BaSO _{4}=0.617 g\\
&\text { Mass of } CaSO _{4} \text { reacted }=\frac{0.617 \times 136}{233}=0.3601 g\\
&\text { Percentage purity of } \operatorname{CaSO}_{4}=\frac{0.3601 \times 100}{0.400}=90.025
\end{aligned}\end{equation}

Ag⁺¹ ion has 18 valence electrons so it is more covalent due to greater polarizability on anion.

Hence option B is correct.

\(2 A+B \rightarrow\) Product

Let rate of reaction, \(r=k[A]^{x} 1[B]^{x_{2}}\)

When concentration of B doubled rate does not changes So \(r_{1}=r_{2}\)

\(\Rightarrow k[A]^{x_{1}}[B]^{x_{2}}=k[A]^{x_{1}}[2 B]^{x_{2}}\)

\(\Rightarrow[B]^{x_{2}}=[2 B]^{x_{2}}\)

\(\Rightarrow x_{2}=0\)

so rate, \(r=k[A]^{x_{1}}\)

Now when Concentration of A doubled half life does not change it means reaction is first order so \(x_{1}=1\)

and \(r=k[A]\)

order of reaction \(=1\)

so unit of rate constant \(= s ^{-1}\)

Hence option B is correct.

Hence B is correct.

Hence option B is correct.

Hydrolysis followed by condensation polymerization of RSiCl₃ produces 3-D cross-linked silicones which are hard.

Hence option B is correct.

Hence option B is correct.