Q. Why are the group V radicals tested in the order Ba2+ Sr2+ and Ca2+?
The test must be carried out in the order Ba2+ → Sr2+ → Ca2+. Because like SrSO4, BaSO4 is also insoluble in acetic acid and like Ca2+ -oxalate, Sr2+ and Ba2+ oxalates are also insoluble. 6. Precipitation must be done in hot solution because in hot solution bicarbonates are changed to insoluble carbonates.
Q. Why do we test group V cations in the order of Ba Sr and Ca?
Only the chromate of barium is insoluble in acetic acid whereas those of calcium and strontium are soluble in acetic acid. b. Both barium and strontium form insoluble sulphates but calcium does not.
Q. Why must the carbonate test be done first?
We do the Carbonate test first because the Barium ions in the Sulphate precipitates with Carbonate ions too. This is because solutions can absorb Carbon Dioxide to form Carbonate ions.
Q. Why anion analysis is performed before cation analysis?
Why is the test for anions done before that of the cations for qualitativa analysis of inorganic salts? that interfere in the detection of cations of group III such as Al, Cr and Fe. That is, when the detection of group III cations is done, these anions get precipitated and get wrongly analysed as group III cations.
Q. What is the basic principle of salt analysis?
What is the Basic Principle of Salt Analysis? Ans. The fundamental principles governing salt analysis are ionic product and solubility product. For a precipitate to form in a reaction, the ionic product must always be greater than the solubility product.
Q. What is the group reagent of 4th group?
| Group | Basic radicals | Group reagent |
|---|---|---|
| III | Al3+, Cr3+, Fe3+ | NH4OH in presence of NH4Cl |
| IV | Zn2+, Ni2+, Mn2+, Co2+ | H2S in ammonical medium |
| V | Ca2+, Ba2+, Sr2+ | (NH4)2CO3+ NH4Cl |
| VI | Mg2+, (Na+, K+ also included) | NH4OH + Na2HPO4 (Only for Mg2+) |
Q. What are the basic radicals belongs to Group IIIA?
In group III, the basic radicals are iron, aluminium and chromium and are precipitated as their hydroxides.
Q. Which of the following is the group reagent for Group 4 cations?
Group IV cations are calcium (II) Ca2+, strontium (II) Sr2+ and barium (II) Ba2+. Its group reagent is 1M solution of ammonium carbonate (NH4)2CO3 in neutral or alkaline medium.
Q. What is the group reagent for precipitating MG?
Magnesium does show similar reactions to IVth group cations; it forms basic magnesium carbonate MgCO3.Mg(OH)2. 5H2O with IVth group reagent ammonium carbonate (NH4)2CO3. But this basic magnesium carbonate is soluble in presence of ammonium salts and therefore it doesn’t precipitate with IV group cations.
Q. Which group does not have a group reagent?
Since, group zero has only one cation i.e. ammonium ion, NH4+, there is no need of calling them group reagent because the group has only one cation.
Q. What are the Group 3 cations?
In today’s lab you will analyze solutions of the Group III cations, which include Cr3+, Al3+, Fe3+ and Ni2+. All the Group III cations form insoluble sulfides or hydroxides in a basic solution saturated with H2S.
Q. How are cations classified into groups?
Cations are divided into six groups. Each group has a common reagent that can be used to separate them from the solution. Because cationic analysis is based on the solubility products of the ions, meaningful results can be obtained only if separation is performed in a specified sequence.
Q. What is the basis of classification of cations into six groups?
The different cations are classified under six groups depending upon the difference in the solubilities of their chlorides, sulphide hydroxides and carbonates at different pH values. शैवाल के वर्गीकरण का क्या आधार हैं।
Q. What are the 5 groups of cations?
The cations are classified into the following 5 groups.
- Group I Cations (Ag+, Hg22+ and Pb2+ – insoluble chlorides):
- Group II Cations (Hg2+, Pb2+, Cu2+, Bi3+, Cd2+, As3+, Sb3+ and Sn4+ – insoluble sulphides in acidic medium):
- Group III Cations (Al3+.
- Group IV Cations (Ca2+, Sr2+ and Ba2+ – carbonate precipitates):
Q. Why is Group 5 called soluble group?
The salts of the cations of group V, with few exceptions, are quite soluble, this accounts for the fact that there is no common precipitating reagent for the group. – This group is called “Soluble Group” because its cations remain soluble throughout the whole scheme of separation.
Q. What is Group 6 called?
Chalcogens
Q. What element is in Group 5 Period 7?
Group 7A (or VIIA) of the periodic table are the halogens: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At)….Group 7A — The Halogens.
| 4A | C |
|---|---|
| 5A | N |
| 6A | O |
| 7A | F |
| 8A | Ne |
Q. What is Group 5 called?
Pnictogens
Q. What is Group 2 called?
Group 2A (or IIA) of the periodic table are the alkaline earth metals: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). In most cases, the alkaline earth metals are ionized to form a 2+ charge.
Q. Which element is in group 10 Period 6?
Group 10, numbered by current IUPAC style, is the group of chemical elements in the periodic table that consists of nickel (Ni), palladium (Pd), platinum (Pt), and perhaps also the chemically uncharacterized darmstadtium (Ds). All are d-block transition metals.
Q. What is Group 3 called?
Group 3 is the first group of transition metals in the periodic table. The group is also called the scandium group or scandium family after its lightest member.
Q. What are 3 elements in the same period?
The third period contains eight elements: sodium, magnesium, aluminium, silicon, phosphorus, sulfur, chlorine, and argon. The first two, sodium and magnesium, are members of the s-block of the periodic table, while the others are members of the p-block….Period 3 element.
| Hydrogen | Rubidium |
|---|---|
| Strontium | |
| Yttrium | |
| Zirconium | |
| Niobium |
Q. What is the name of the element in Group 3 Period 4?
“The Element Phosphorus.” It’s Elemental -. N.p., n.d. Web.
Q. Why is boron in Group 3 of the periodic table?
Group III elements is because that’s how electrons and valencies and stuff works, in the first three periods. Group 13 is because you have a gap of ten elements that is filled-in in the remaining four periods.
Q. What element is lanthanide with least mass?
Europium (Eu), chemical element, a rare-earth metal of the lanthanide series of the periodic table. Europium is the least dense, the softest, and the most volatile member of the lanthanide series.
Q. Is boron Group 3 or 13?
Boron group element, any of the six chemical elements constituting Group 13 (IIIa) of the periodic table. The elements are boron (B), aluminum (Al), gallium (Ga), indium (In), thallium (Tl), and nihonium (Nh).
Q. Why is Group 14 called the carbon family?
The carbon family is also called the carbon group, group 14, or group IV. At one time, this family was called the tetrels or tetragens because the elements belonged to group IV or as a reference to the four valence electrons of atoms of these elements. The family is also called the crystallogens.
Q. What happens to reactivity down the group 17?
The chemical reactivity of group 17 elements decreases down the group. So down the group there is an increase in the atomic radius and hence the effective nuclear force decrease as the atomic radius increases and this leads to the decreased chemical reactivity down the group.
Q. What is another name for Group 14?
The carbon group is a periodic table group consisting of carbon (C), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), and flerovium (Fl). It lies within the p-block. In modern IUPAC notation, it is called Group 14. In the field of semiconductor physics, it is still universally called Group IV.
Q. Is Group 14 metal or nonmetal?
carbon group
