Q). Potassium and calcium belong to
A) s-block elements
B) p-block elements
C) d-block elements
D) f-block elements
Q). Which of the following are lanthanides?
A) K to Kr
B) Cs to Lu
C) Ce to Lu
D) Th to Lr
Q). The correct order of atomic sizes of K, Ca, Na, Cl is
A) K > Ca > Na > Cl
B) K < Ca < Na < Cl C) Ca >,K > Cl > Na
D) Na > Cl > K > Ca
Q). Generally metallic character in period from left to right
A) increases
B) decreases
C) is equal for all elements
D) none
Q). Generally the chemical bond formed between IA and VIIA group elements is
A) electrovalent bond
B) covalent bond
C) metallic bond
D) dative bond
Q). The element with highest electronegativity belongs to
A) 3rd period and 17th group
B) 2nd period and 17th group
C) 2nd period and 16th group
D) 2nd period and 18th group
Q). According to VSEPR theory, the shape of molecule with two bond pairs in two covalent bonds around the nucleus of the central atom with two lone pairs in the valence shell is
A) V shape
B) trigonal planar
C) tetrahedral
D) linear
Q). Which one of the following is not a polar molecule?
A) H2O
B) HCl
C) NH3
D) BF3
Q). Ionic compounds are soluble in
A) non-polar solvents
B) ether
C) polar solvents
D) CCl4
Q). The formula of galena is
A) ZnS
B) MnO2
C) CaCO3
D) PbS