Select the correct statement :
(1) reduces to metallic Ag.
(2) Organic tissues turn black by reducing it to Ag.
(3) is soluble in .
(4) All are correct statements.
Which of the following statements is true for the compounds [X], [Y] and [Z] ?
1. | In all three compounds, the chromium is in +6 oxidation states. |
2. | [Z] is a deep blue-violet coloured compound which decomposes rapidly in aqueous solution into and dioxygen. |
3. | Saturated solution of [Y] gives a bright orange compound, chromic anhydride, with concentrated |
4. | All of these |
The yellow colour solution of changes to orange-red on passing gas due to the formation of :
(1)
(2)
(3)
(4)
Assertion : Cuprous ion is colourless whereas cupric ion produces blue colour in solution.
Reason : Cuprous ion has unpaired electrons while cupric ion does not.
Assertion : The number of unpaired electrons in the following gaseous ions:
are 4, 3, 2 and 1 respectively
Reason : is stable in aqueous solution.
Assertion : Ammonical silver nitrate converts glucose to gluconic acid and metallic silver is precipitated.
Reason : Glucose acts as a weak reducing agent.
on treatment with conc. forms a compound (X) which decomposes explosively on heating forming (Y). The (X) and (Y) are respectively :
(A)
(B)
(C)
(D)
Which of the following products are formed when potassium bromide reacts with potassium permanganate in alkaline pH?
1.
2.
3.
4.
Excess of Kl reactions with solution and solution is added to it. Which of the following statement is incorrect for this reaction ?
(1) Evolved is reduced
(2) is formed
(3) is oxides
(4) is formed.
Assertion: To a solution of potassium chromate if a strong acid is added it changes its colour from yellow to orange.
Reason : The colour change is due to the oxidation of potassium chromate.