- (A) Soil porocity
- (B) Proper growth of plants
- (C) Alkalinity of soil
- (D) All
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- (A) H2SnO3
- (B) H2SiO3
- (C) H3AsO4
- (D) H3SbO4
- (A) Pb2O
- (B) Pb3O4
- (C) PbO2
- (D) All of the above
- (A) decrease
- (B) increase
- (C) remains constant
- (D) first decreases then increases
- (A) metal borate
- (B) metal meta borate
- (C) metal boride
- (D) metal silicate
- (A) it has small size
- (B) it has high nuclear charge
- (C) it forms molecular addition compounds
- (D) all of the above
- (A) Ch3
- (B) OH
- (C) OCH3
- (D) O2
- (A) Beryllium
- (B) Carbon
- (C) Silicon
- (D) Aluminium
- (A) As antiseptic in medicine
- (B) For washing eyes
- (C) In soda bottles
- (D) For enamel and glazes
- (A) it combines with H2O to form carbonic acid
- (B) it reacts with red blood cells of haemoglobin
- (C) it is powerful oxidizing agent
- (D) it is used to prepare aerated drinks
