When a metal is burnt, its mass is increased by 24 percent. The equivalent mass of the metal will be:
1. 25
2. 24
3. 33.3
4. 76
The equivalent mass of H3PO4 in the following reaction is,
H3PO4 + Ca(OH)2 CaHPO4 + 2H2O
1. 98
2. 49
3. 32.66
4. 40
1.520g of the hydroxide of a metal on ignition gave 0.995 g of oxide. The equivalent mass of metal is:
1. 1.520
2. 0.995
3. 19.00
4. 9.00
What will be the normality of a solution obtained by mixing 0.45 N and 0.60 N NaOH in the ratio 2:1 by volume?
1. 0.4 N
2. 0.5 N
3. 1.05 N
4. 0.15 N
A metal oxide is reduced by heating it in a stream of hydrogen. It is found that after complete reduction, 3.15 g of the oxide have yielded 1.05g of the metal. We may deduce that:
1. the atomic mass of the metal is 8
2. the atomic mass of the metal is 4
3. the equivalent mass of the metal is 4
4. the equivalent mass of the metal is 8
An oxide of metal has 20% oxygen, the equivalent mass of oxide is:
1. 32
2. 40
3. 48
4. 52
A compound contains atoms of three elements A,B and C. If the oxidation number of A is +2, Bis +5 and that of C is -2, the possible formula of the compound is :
1. A2(BC3)2
2. A3(B4C)2
3. A3(BC4)2
4. ABC2
The number of peroxide linkages in CrO5 is /are
1. One
2. Two
3. Three
4. None of the above
Conversion of PbSO4 to Pbs is:
1. Reduction of S
2. Oxidation of S
3. Dissociation
4. None of the above
Redox reaction among the following is -
1. NaCl + KNO3 NaNO3 + KCl
2. CaC2O4 + 2HCl CaCl2 + H2C2O4
3. Mg(OH)2 + 2NH4Cl MgCl2 + 2NH4OH
4. Zn + 2AgCN 2Ag + Zn(CN)2
The oxidation number of Fe in K3[Fe(CN)6] is-
1. +2
2. +3
3. +4
4. +1
It is found that v forms a double salt isomorphous with Mohr's salt. The oxidation number of V in this compound is:
1. +3
2. +2
3. +4
4. -4
The correct order of reducing power of halide ions is:
1. Cl- > Br- > I- > F-
2. Cl- > I- > Br- > F-
3. Br- > Cl- > I- > F-
4. I- > Br- > Cl- > F-
The reaction during which nitrogen gets oxidised is-
1. N2
2. NO
3. NO2
4. N
Reaction that shows hydrogen as an oxidising agent is -
1. With ioding to give hydrogen iodide
2. With lithium to give lithium hydride
3. With nitrogen to give ammonia
4. With sulphur to give hydrogen sulphide
Fluorine is a strong oxidising agent because:
1. it has several isotopes
2. it is very small and has 7 electrons in valency shell
3. its valency is one
4. it is the first member of the halogen series
The oxidation state of Ni in Ni(CO)4 is:
1. zero
2. +4
3. +8
4. +2
Sulphurous acid can be used as:
1. Oxidising agent
2. Reducing agent
3. Bleaching agent
4. All of the above
When SO2 is passed through acidified solution of potassium dichromate, then chromium sulphate is formed. The change in oxidation number of chromium is:
1. +4 to+2
2. +5 to+3
3. +6 to+3
4. +7 to+2
In the reaction;
2Ag + 2H2SO4 Ag2SO4 + 2H2O + SO2, H2SO4 acts as:
1. Oxidizing agent
2. Reducing agent
3. Dehydrating agent
4. None of the above
Which of the following shows the highest oxidation number in the combined state?
1. Os
2. Ru
3. Xe
4. All of the above
In the preparation of chlorine from HCl; MnO2 acts as:
1. Reducing agent
2. Oxidising agent
3. Catalytic agent
4. Dehydrating agent
In the equation,
N + H2O N + 2H+ + ne-
n represents
1. 5
2. 1
3. 2
4. 3
Reaction between acidified K2Cr2O7 and iron (II) ions shown by the equation:
Cr2(aq) + 6Fe2+(aq) +14H+(aq)2Cr3+(aq) + 7H2O(l) + 6Fe3+(aq)
The correct statement among the following is -
1. Colour of the solution changes from green to blue
2. Iron (II) ions are reduced
3. Dichromate ions are reduced
4. Hydrogen ions are reduced
Which metal exhibits more than one oxidation states?
1. Na
2. Mg
3. Al
4. Fe
Among the following, In which iron has the lowest oxidation state?
1. Fe(CO)5
2. Fe2O
3. K4Fe(CN)6
4. FeSO4.(NH4)2SO4.6H2O
When an acidified solution of ferrous ammonium sulphate is treated with KMnO4 solution, the ion that gets oxidised is:
1. Fe2+
2. S
3. N
4. Mn
2Na2S2O3 + I2 Na2S4O6 + 2NaI,
the oxidation state of sulphur in tha above reaction:
1. Decreases
2. Increases
3. Remain unchanged
4. None of the above
In a redox change, the oxidant K2Cr2O7 is always reduced to:
1. Cr5+
2. Cr4+
3. Cr3+
4. Cr2+
Which of the following reactions does not represent a redox change?
1. CaCO3 CaO + CO2
2. 2H2 + O2 2H2O
3. Na + H2O NaOH + \(\frac{1}{2}\)H2
4. MnCl3 MnCl2 + \(\frac{1}{2}\)Cl2
In the reaction;
3Br2 + 6C + 3H2O 5Br- + Br + 6HC
which statement is correct?
1. Br2 is oxidised
2. Br2 is reduced
3. Br2 is neither oxidised nor reduced
4. Br2 is oxidised and reduced as well
Amongst the following species that have an atom in (+6) oxidation state is-
1. Mn
2. Cr
3. Ni
4. CrO2Cl2
A metallic oxide contains 20% oxygen. The equivalent weight of metal is
1. 12
2. 16
3. 32
4. 64
Which one is correct about CH2 = CCl2?
1. Both carbons are in +2 oxidation state.
2. Both carbons are in +1 oxidation state.
3. One carbon has +2 and other -2 oxidation states.
4. The average oxidation number of carbon is +1.
What is the equivalent weight of H3PO3 in the following disproportionation reaction:-
H3PO3 H3PO4 + PH3
1.
2.
3.
4.
25.0 g of FeSO4.7H2O was dissolved in water containing dilute H2SO4, and the volume was made up to 1.0 L. 25.0 mL of this solution required 20 mL of an N/10 KMnO4 solution for complete oxidation. The percentage of FeSO4. 7H2O in the acid solution is
(1) 78%
(2) 98%
(3) 89%
(4) 79%
Which one of the following orders correctly represents the increasing acid strengths of the given acids?
(1) HOCl <HOClO <HOClO2 < HOClO3
(2) HOClO <HOCl <HOClO3 <HOClO2
(3) HOClO2 <HOClO3 <HOClO <HOCl
(4) HOClO3> HOClO2 <HOClO <HOCl
The valency of Cr in the complex [Cr(H2O)4Cl2]+ [MP PMT 2000]
(1) 1
(2) 3
(3) 5
(4) 6
Oxidation number of cobalt in K[Co(CO)4] is
(1) + 1
(2) + 3
(3) – 1
(4) – 3
The oxidation number of phosphorus in Ba(H2PO2)2 is [Kurukshetra CEE 1998; DCE 2004]
(1) – 1
(2) + 1
(3) + 2
(4) + 3
When KMnO4 acts as an oxidising agent and ultimately forms then the number of electrons transferred in each case respectively is -
(1) 4, 3, 1, 5
(2) 1, 5, 3, 7
(3) 1, 3, 4, 5
(4) 3, 5, 7, 1
For the redox reaction the correct coefficients of the reactants for the balanced reaction are
|
|
|
|
(1) |
2 |
5 |
16 |
(2) |
16 |
5 |
2 |
(3) |
5 |
16 |
2 |
(4) |
2 |
16 |
5 |
The strongest oxidising agent among the following is -
1.
2.
3.
4.
Oxidation number of oxygen in potassium super oxide (KO2) is-
1. – 2
2. – 1
3. – 1/2
4. – 1/4
In a balanced equation , the values of x, y, z are -
(1) x = 3, y = 5, z = 2
(2) x = 4, y = 8, z = 5
(3) x = 8, y = 4, z = 4
(4) x = 5, y = 3, z = 4