Class X Chemistry

Assignment 1

Mm.50

Q.1 (i) Arrange the following in increasing order of metallic character

Mg , Ca ,K , Ga

(ii) ) Arrange the following in increasing order electronegativity

I, Br, Cl , F.

(iii) ) Arrange the following in increasing order Ist ionisation potential

O, Be ,N , F

(iv) ) Arrange the following in increasing order of acidity

Cl2O CaO Na2O SiO2 (v) ) Arrange the following in increasing order of their atomic radii

Li Be F N

Q. 2 Define following and explain their periodicity in period as well in group

(a) Ionisation potential (b) Electron Affinity (c) Atomic radii

Q.3 Draw electron dot structure of following

N2 HCl CCl4 O2 Q.4 (i ) with the help of electron structure show the formation of Ammonium ion via coordinate bond , and hydronium ion

(ii) Melting point and boiling point of electrovalent compound are high ,why ? ( 5X4)

Q .5 (i) HCl is covalent compound but ionise in water why.

(ii) which type of bond exist in (i) NH4Cl (ii)KCl (iii) SO2 (iii) which type of bonding exist in Diamond and silica

(iv) how many lone pair of electron are present in following NH3 H2O (v) with the help of atomic number find out No. Of valence electron in following

(a) 15P 19K (vi) write down the name of element placed in 18th group of long form of periodic table

(vii) Name the unit used to express ionisation potential and electron affinity

(viii) Name the following element which have :

(a) Highest ionisation energy (b) Lowest ionisation energy

(ix) Name the following element

(a) A liquid metal (b) Solid halogen

(x) Halogen behave like good oxidising agent why. (2x10)

Q.6 Name the following

(i) A member of halogen family ,solid in state

(ii) A element which is a sublimable

(iii) Highly electronegative element

(iv) A light metal which has three valency

(v) An element of 4th period which gives lilac flame

(vi) two light members of alkali metal group

(vii) what is the shape of methane molecule

(viii) type of bonding present in SO2 (ix) Name two molecule showing multiplicity of bonds

(x) which property decides the polarity in molecule? (1x10)