Chemistry Test ...

The uncertainty in position of an electron is equal to its de Broglie wavelength. The minimum percentage error in its measurement of velocity under this circumstance will be approximately.

What happens when a mixture of NaCl and K₂Cr₂O7 is gently warmed with conc. H₂SO₄?

(A) major; (A) is -

\(k_{s p}\) for AgCl is

Given: \(T=25^{\circ} \mathrm{C}\)

\(\Delta_{f} H^{\circ} A g^{\oplus}=25.3 k c a l / m o l\)

\(\Delta_{f} H^{\circ} C l^{\ominus}=-40 k c a l / m o l\)

\(\Delta_{f} H^{\circ} A g C l=-30.36 k c a l / m o l\)

\(S_{A g^{+}}^{\circ}, S_{d \theta}^{\circ}, S_{A g C l}^{\circ}\)

are 17.7,13.2 and 23.0 cal/mol. (Antilog \(0.21=1.6)\)

Which of the following factors is/are responsible for increase in the rate of surface-catalysed reactions?

1. A catalyst provides proper orientation for the reactant molecules to react.

2. Heat of adsorption of reactants on a catalyst helps the reactant molecules to overcome the activation energy.

3. The adsorption of reactants on the catalyst surface decreases the activation energy of the reaction.

4. Adsorption increases the local concentration of reactant molecules on the surface of the catalyst.

Which of the following metals does not form amalgams?

Which of the following statements is/are correct regarding defects in solids?

[X₃B ← NH₃], in which of the following boric halide, tendency to accept electrons from nitrogen of ammonia will be least ? (X = halogens)

In which of the following bonds are non-directional?

Which of the following statements is/are correct concerning the structures E, F and G?

\(\stackrel{O S O_{4}}{\longrightarrow}\) \(X+Y\)12: 1

Product (x) will be

Salt \((A)+S \rightarrow B \stackrel{B a C l_{2}}{\longrightarrow}\)White ppt. A is paramagnetic. Thus A is:

The enolate ion that reacts with 3–buten–2–one to form (Y) is:

When conc. H₂SO₄ is treated with K₄[Fe(CN)₆], Co gas is evolved. By mistake, somebody used dil.H₂SO₄, then which gas will be released?