Explore topic-wise InterviewSolutions in Current Affairs.

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The chief ore of $Zn$ is its sulphide, $ZnS$. The ore is concentrated by froth floatation process and then heated in air to convert $ZnS$ to $ZnO$. The following reactions take place in the extraction of $Zn$:

$2ZnS+3O_2\to 2ZnO+2S{O}_2\text{(Yield: 62.5 \%)}$

$ZnO+H_{2}S{O}_4\to ZnS{O}_4+H_{2}O\text{(Yield: 80 \%)}$

$2ZnS{O}_4+2H_{2}O\to 2Zn+2H_{2}S{O}_4+O_2\text{(Yield: 80\%)}$

The number of moles of $ZnS$ required for producing $2$ mol of $Zn$ will be:

Among the second period elements the actual ionization enthalpies are in the

order Li < B < Be < C < O < N < F < Ne.

Explain why

(i) Be has higher Δ_iH than B

(ii) O has lower Δ_iH than N and F?

What types of bonds are present in copper (II) sulphate pentahydrate?

For the water gas reaction

$\text{C}\left(S\right)+{\text{H}}_{2}O\left(g\right)\rightleftharpoons \text{CO}\left(g\right)+{\text{H}}_2\left(g\right)$

At $1000\text{K}$ the standard Gibbs free energy change of the reaction is$-8.314\text{kJ/mol}$. Therefore at $1000K$ the equilibrium constant of the above water gas reaction is:

$(\text{Where}e=2.718=\text{Euler's number})$

1 mole of a gaseous aliphatic compound $C_n{H}_{3m}$ is completely burnt in an excess of oxygen. The moles of $H_{2}O$ formed are:

Bauxite is purified by

The gold number of certain lyophillic colloids is given below. Which of the following is most effective in protection of lyophobic colloids against coagulation?
Gelatine – 0.01, Haemoglobin – 0.07, Albumen – 0.2, Potato starch – 25

By what unit the oxidation number changes for underline elements in the following reaction-

Zn + HNO₃ → NH₄NO₃ + Zn (NO₃)₂ + H₂O

Which one of the following contains a non-metallic cation?

Which of the following oxoacids of sulphur has $–O–O–$ linkage?

Density
of a gas is found to be 5.46 g/dm³
at 27 °C at 2 bar pressure. What will be its density at STP?

The target organ of glucagon and adrenaline is

Defination of azeotropic mixture

Arrange the following in increasing order of their boiling points.

Which one is an example of
gel

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?

For this reaction at 300 K $A\left(g\right)+B\left(g\right)\to C\left(g\right)△U=-3.0kcal;△S=-10.0cal/K$ value of $△G$ is :

For the reversible reaction, $N_2\left(g\right)+3H_2\left(g\right)\rightleftharpoons 2N{H}_3\left(g\right)$ at ${500}^{o}C,$ the value of $K_p$ is $1.44\times {10}^{-5}$, when partial pressure is measured in atmosphere. The corresponding value of $K_c,$ with concentration in $mol{L}^{-1},$ is

What
inspired N. Bartlett for carrying out reaction between Xe and PtF₆?