Study the table given below. Use only the letters given in the table to answer the questions. Do not identify the elements.
| IA | IIA | IIIA | IVA | VA | VIA | VIIA | 0 |
|---|---|---|---|---|---|---|---|
| E | J | Q | |||||
| L | G | ||||||
| M | D | P | |||||
| N |
(a) State the valency of element ‘G’.
(b) Which element can exhibit catenation?
(c) Write the formula of the compound formed between ‘M’ and ‘P’.
(a) Element G
Explanation – Element G belongs to group VA (group 15). Group 15 elements have 5 valence electrons in their outermost shell they can gain 3 electrons to complete the octet hence, the valency will be 3.
(b) Element E
Explanation – Catenation (ability to form long chains of its own atoms) is strongest in the group IVA (14) element shown, i.e., E.
(c) Element M
Explanation – M is in group IIA they have 2 valence electrons and forms M2+ and P is in group VIIA have 7 valence electrons and forms P−, so one molecule of M combines with two molecules of P. Hence, the neutral formula is MP2.
More ICSE Moderate level questions
Given below are four ions: Cl−, Li+, Al3+, K+ Identify the pair of ions which have the same electronic configuration. [Atomic number: Cl = 17, Li = 3, Al = 13, K = 19] (a) Cl− & Li+ (b) Al3+ & K+ (c) Cl− & K+ (d) Li+ & K+
The atomic number of two atoms ‘X’ and ‘Y’ are 14 and 8 respectively. State: (a) the period to which ‘X’ belongs. (b) the formula of the compound formed between ‘X’ and ‘Y’. (Do not identify X and Y)
Assertion (A): The tendency of losing electrons increases down the Group. Reason (R): The most reactive metal is placed at the top of Group 1. (a) Both (A) and (R) are true, and (R) is the correct explanation of (A). (b) Both (A) and (R) are true, and (R) is not the correct explanation of (A). (c) (A) is true but (R) is false. (d) (A) is false but (R) is true.
State the terms for the following: (a) Undistilled alcohol containing a large amount of methanol. (b) A salt formed by the partial replacement of the hydroxyl group of a di-acidic or a tri-acidic base by an acid radical. (c) Organic compounds having the same molecular formula but different structural formula. (d) The tendency of an atom to attract the shared pair of electrons towards itself when combined in a compound. (e) The type of covalent bond in which electrons are shared unequally between the combining atoms.
X, Y & Z are three metallic atoms in successive order belonging to the same group such that atomic radii of ‘X’ is the smallest. Which of the three atoms is the best reducing agent? (a) X (b) Y (c) Z (d) All three have the same reducing power
Given below are two sets of elements from two different periods. Name the element with the highest ionisation potential in each of the following sets. (a) Al, Cl, Mg (b) Ne, O, F
Arrange the following as per the instruction given in the brackets: (a) Al, K, Mg, Ca (decreasing order of its reactivity) (b) N, Be, O, C (increasing order of non-metallic character) (c) P, Si, F, Be (decreasing order of valence electrons)
Elements P, Q, and R are in the same period of the modern periodic table. P readily loses its one valence electron to form a stable ion. Q shares its electrons in bonding but does not form ions easily. R has high electronegativity. Answer the following questions based on the above information: (a) Which element would be most difficult to reduce among P, Q and R? (b) Which element is expected to have the smallest atomic radius among P, Q and R? (c) Arrange P, Q and R in order of decreasing ionisation potential.
Given below are a few elements. Li, Li, K, Ca, F Identify the element which: (a) has the least atomic radius. (b) has two valence electrons. (c) is the most electropositive.
Element A belongs to group 15 and period 2 of the Periodic Table. (a) Identify the element A. (b) Write the formula of the compound formed when element A combines with hydrogen. (c) Draw the dot (•) and cross (×) structure of the compound formed in (b) above.
Identify the following: (a) An element in period 1 which can be placed in both group 1 and group 17 of the Periodic Table. (b) The element having electronic configuration 2, 8, 6. (c) The most electronegative element of period 3.
Arrange the following as per the instructions given in the brackets: (a) Carbon, Fluorine, Beryllium (decreasing order of atomic size) (b) Sulphuric acid, Phosphoric acid, Acetic acid (increasing order of number of replaceable H atoms per molecule) (c) Potassium, Lithium, Sodium (increasing order of ionization potential)
