Question

Q1.
Write chemical equation for the following reaction
when solid mercury (II) oxide is heated, liquid mercury and oxygen gas are produces

Q2.
By passing electric surrent through whater, H2 and O2 are obtained as
2H20----electric current--->2H2+O2. But H2 and O2 can also be combined to form water
2H2+O2----2H2O

The first reaction is decomposition reaction and second is combination reaction. Is that statement true ? Justify

Q.3
The representation of a chemical reaction by using the symols and formula of reactants and products is called
(A) Chemical Reaction
(B) Chemical Equation
(C) Balanced Chemical Reaction
(D) All of these

Q.4.
When sulphur dioxide is passed through a saturated solution if hydrogen sulphide, the following reaction occurs : SO2+2H2S---->2H2O+35 Preduct reducing agent and oxidizing agent in this reaction.

Q.5.
When a copper strip is placed in a solution of silver nitrate, copper nitrate and silver are formed. Name the reaction

Q.6.
When magnesius burns in Cl2, it forms magnesium chloride. which element is reduced

Help fast with all these answers

Answer 1

1. 2HgO -----> 2Hg + O2(g)
2. yes it is true as in first reaction, water decomposes to form h2 and o2 gas while in second reaction, H2 and oxygen combines to form water.
3.B) chemical equation
4. Here, sulphur is reduced from SO2 to S
and hydrogen is oxidised to form water.
5.displacement reaction (not double displacement)
6.magnesium is redused to mg chloride .