问题 选择题

用惰性电极电解下列溶液,一段时间后,再加入一定质量的另一物质(中括号内),溶液能与原来溶液完全一样的是

A.CuCl2[CuCl2溶液]

B.AgNO3[Ag2O]

C.NaCl [HCl溶液]

D.CuSO4[Cu(OH)2]

答案

答案:B

题目分析:电解池中,要想使电解质溶液复原,遵循的原则是:电解后从溶液中减少的物质是什么就利用元素守恒来加什么。A、电解氯化铜时,阳极放氯气,阴极生成金属铜,所以应加氯化铜固体让电解质溶液复原,故A错误;B、电解硝酸银时,阳极产生氧气,阴极产生银,所以应加Ag2O让电解质溶液复原,故B正确;C、电解氯化钠时,阳极产生氯气,阴极产生氢气,所以通入氯化氢气体让电解质溶液复原,故C错误;D、电解硫酸铜时,阳极产生氧气,阴极产生金属铜,所以应加氧化铜让电解质溶液复原,故D错误,答案选B。

阅读理解

In Britain arrangements for inviting and entertaining guests at a wedding are usually the responsibility of the bride's family.In most cases it is mainly friends and relations of both families who are invited but when bride's father is a businessman of some kind, the  wedding reception may provide a useful occasion for establishing social connections with clients or customers and other people whose goodwill may be of advantage to him.it is, however, the bride's mother who has the job of sending out the formal printed invitation cards.

In the case of a church wedding, the vicar of each parish(教区) in which the bride and bridegroom live is normally informed about a month in advance of the ceremony so that an announcement of the coming wedding can be made in church on each of three Sundays before it takes place.Anyone who may know of an existing marriage of either partner is ordered to give information, though this means of avoiding bigamy must have been more effective in the days when people attend the religious service and the bride usually wears the traditional long white dress and veil, while her bridesmaids, who are children, wear long dresses in attractive colors.This may also happen in the case of a civil wedding in a register office but is probably less usual.

The reception which follows may be held in a restaurant, a local hall or, when there are few guests, in the bride’s own home.Refreshments are provided, a special iced wedding-cake is cut(usually to the accompaniment of speeches)and distributed to the guests, toasts are drunk and dancing may follow.At some point in the celebrations, the bride goes off to change into everyday clothes and then leaves the party with her husband to go on their honeymoon, the journey they will make together, often in romantic surrounding abroad.

小题1:It is the bride's parents who normally have to________.

A.make all the arrangements for the wedding

B.provide hospitality for the people attending

C.decide who shall be invited

D.pay all expenses involved小题2:What possible difference is suggested between a church and a civil wedding?

A.Civil weddings are less commonly followed by a reception.

B.It is less usual for guests to attend the civil wedding formalities.

C.Guests at civil weddings are less formally dressed.

D.There could be less attention paid at the latter to convention and picturesque effect.小题3:The reception normally takes place in the bride’s home if________.

A.this is a large one.

B.there is enough room to entertain the people invited.

C.the parents cannot afford to hire a hall.

D.there is to be no party afterwards.小题4:The couple leave for their honeymoon________.

A.after the church or register office ceremony

B.immediately after the cake has been cut and the speeches made

C.at the end of the reception

D.as soon as the bride is ready

判断题