Chemistry

The law of definite proportions states that?

A. pure samples of the same compound contain the same elements combined in the same proportion by mass B. pure…

6 years ago

Which of the following statements is true about ionic radius? Ionic radius?

A. increases as nuclear charge increases B. decreases as nuclear charge increases C. decreases as nuclear charge decreases D. remains…

6 years ago

Which of the following methods can be used to separate blood cells from plasma?

A. Centrifugation B. Filtration C. Chromatography D. Distillation Correct Answer: Option A  

6 years ago

The change in the oxidation state of iron in the reaction represented by the equation is?

2FeCl3+H2S→2FeCl2+2HCl+S A. +2 to +3 B. 0 to +2 C. +3 to +2 D. +3 to 0 Correct Answer: Option…

6 years ago

The empirical formula of a compound containing 0.067mol Cu and 0.066mol O is [Cu = 63.5, O = 16]

A. Cu2O B. CuO C. CuO2 D. CuO4 Correct Answer: Option B Explanation Cu : O 0.067 : 0.066 mole…

6 years ago

When zinc is added to AgNO3 solution, crystals of silver form on the zinc surface. This indicates that zinc is?

A. oxidised B. reduced C. decomposed D. dissociated Correct Answer: Option A Explanation Reaction: 2AgNO3+Zn→Zn(NO3)2+2Ag The oxidation number of Zn…

6 years ago

The strength of metallic bonds depends on the?

A. charge density of the atoms B. ductility of the metal C. number of valence electrons D. total number of…

6 years ago

When chlorine is passed through a sample of water, the pH of the water sample would be?

A. < 7 B. > 7 C. = 7 D. 0 Correct Answer: Option A A. < 7 Explanation Cl2+H2O…

6 years ago

One of the criteria for confirming the purity of benzene is to determine its?

A. heat capacity B. boiling point C. mass D. colour Correct Answer: Option B B. boiling point Explanation Any pure…

6 years ago