Copper metal will react with concentrated trioxonitrate (V) acid to give?
Cu(NO3)3 + NO + N2O4 + H2O
Cu(NO3)2 + NO + H2O
CuO + NO2 + H2O
Cu(NO2)3 + NO2 + H2O
Correct answer is D
No explanation has been provided for this answer.
The colonization of Liberia began in what year?
1875
1822
1807
1850
Correct answer is B
The colonization of Liberia began in the year 1822. Liberia was founded by the American Colonization Society (ACS) as a place to send free African-Americans, who were freed from slavery but faced racial discrimination in the United States. The ACS believed black people would face better chances for full lives in Africa.
silver and copper
silver and gold
copper and nickle
copper and zinc
copper and tin
Correct answer is E
Bronze is an alloy of copper and tin.
PbO(s) + Br- + KNO3
Br2 + NO2(g) + PbBr2(s)
PbO(s) + K+(aq) + Br(aq) + NO2(g)
PbBr2(s) + K(aq) + K+(aq) + NO3(aq)
Correct answer is D
No explanation has been provided for this answer.
Which of the following is a property of ionic chlorides?
They can be decomposed by heat
They react with aqueous AgNO3 to give a white precipiate which is soluble in excess ammonia
They explode when in contact with dry ammonia
They react with concentrated tetraoxosulphate (IV) acid to give white fumes of chlorine gas
Correct answer is B
No explanation has been provided for this answer.