*Nitrogen. Water*2*38*1*

#692

*!Nitrogen (to exist) in the state of combination in nitre or salpetre.

Which form of the verb in brackets is the most suitable for this sentence?

*exist

*+exists

*has existed

*are existed

*have existed

#693

*!We must (to call) nitrogen a neutral substance

Which form of the verb in brackets is the most suitable for this sentence?

*are called

*calls

*+call

*called

*is calling

#694

*!Liquid water (to freeze) at 0º C into crystalline ice.

Which form of the verb in brackets is the most suitable for this sentence?

*freeze

*+freezes

*frozen

*froze

*is freezing

#695

*!Water (to be) a compound substance which consist of two elements

Which form of the verb in brackets is the most suitable for this sentence?

*is being

*has been

*have been

*are

*+is

#696

*!Water (to boil) 100º under 760 mm pressure

Which form of the verb in brackets is the most suitable for this sentence?

*is boiling

*has been boiling

*have boiled

*boil

*+boils

#697

*!Nitrogen (to occur) in the free state in air, of which it forms four-fifths by volume.

Which form of the verb in brackets is the most suitable for this sentence?

*is occurring

*has been occurring

*have occurred

*occur

*+occurs

#698

*!Nitrogen is a colourless, tasteless and inodorous gas.

Which question is the general question to this sentence?

*What is a nitrogen?

*What gas is a nitrogen?

*Is a nitrogen a colourless or not?

*+Is nitrogen a colourless, tasteless and inodorous gas?

*Nitrogen is a colourless, tasteless and inodorous gas, isn’t it?

#699

*!Water plays a vital part in the nutrition of animals and plants.

Which question is the general question to this sentence?

*Does water play a vital part in the nutrition of animals or not?

*What part does water play in the nutrition of animals and plants?

*+Does water play a vital part in the nutrition of animals and plants?

*Water doesn’t play a vital part in the nutrition of animals and plants, does it?

*Water plays a vital part in the nutrition of animals and plants, doesn’t it?

#700

*!Water is purified by distillation.

Which question is the general question to this sentence?

*How is water purified?

*+Is water purified by distillation?

*What liquid is purified by distillation?

*Water is purified by distillation, isn’t it?

*What is distillation?

#701

*!Boiling purifies water.

Which question is the general question to this sentence?

*What liquid does boiling purify?

*What purifies water?

*+Does boiling purify water?

*Boiling purifies water, doesn’t it?

*How is water purified?

#702

*!Water is a compound substance.

Which question is the general question to this sentence?

*Water is a compound substance, isn’t it?

*+Is water a compound substance?

*What element is water?

*Is water a compound substance or not?

*Water isn’t a compound substance, is it?

#703

*!Water is purified by boiling

Which questions is a special one to the underlined word?

*What is water?

*Why do we use water?

*Is water purified?

*+How is water purified?

*What liquid is purified?

#704

*!We obtain nitrogen by burning phosphorus.

Which questions is a special one to the underlined word?

*How do we obtain nitrogen?

*Do we obtain nitrogen by burning phosphorus?

*+What do we obtain by burning phosphorus?

*What element is nitrogen?

*What do we burn to obtain nitrogen?

#705

*!Hydrogen and oxygen are the elements of water.

Which questions is a special one to the underlined word?

*What is water?

*+What are the elements of water?

*Hydrogen and oxygen are the elements of water, aren’t they?

*Are hydrogen and oxygen the elements of water?

*What is hydrogen?

#706

*!The boiling kills any germs which are present in water.

Which questions is a special one to the underlined word?

*How are germs present in water?

*What is boiling?

*Does boiling kill any germs which are present in water?

*What germs are present in water?

*+What kills germs which are present in water?

#707

*!Water consists of hydrogen and oxygen.

Which questions is a special one to the underlined word?

*Does water consist of hydrogen and oxygen?

*What elements does water consist of?

*+What consists of hydrogen and oxygen?

*What is hydrogen and oxygen? *What liquid is water?

#708

*!Water is a compound substance consisting of hydrogen and ….

Which word is missed in this sentence?

*nitrogen

*+oxygen

*methane

*propane

*uranium

#709

*!We must call nitrogen a …… substance .

Which word is missed in this sentence?

*compound

*+neutral

*poisonous

*alcoholic

*unctuous

#710

*!Nitrogen can be prepared by burning ……in closed volume of air.

Which word is missed in this sentence?

*mercury

*sulphur

*phosphate

*+phosphorus

*nitrate

#711

*!Nitrogen is prepared by ...phosphorus in closed volume of air.

Which word is missed in this sentence?

*soaking

*boiling

*freezing

*+burning

*mollifying

#712

*!Water may be purified by …

Which word is missed in this sentence?

*steeping

*soaking

*+boiling

*burning

*soothing

#713

*!In chemical laboratories ordinary water is….

Which word is missed in this sentence?

*refrigerated

*frozen

*+distilled

*polluted

*heated

#714

*!Nitrogen gas can be…by burning phosphorus.

Which missed verb is appropriate to this sentence?

*has been obtained

*+obtained

*obtaining

*obtain

*obtains

#715

*!...water helps to work with chemical substances

Which word is missed in this sentence?

*polluted

*ordinary

*fresh

*+distilled

*liquid

#716

*!Liquid water … at 0ºC into crystalline ice.

Which word is missed in this sentence?

*melts

*heats

*burns

*boils

*+freezes

#717

*!Steam or water …is an invisible colourless gas.

Which word is missed in this sentence?

*acid

*germ

*fume

*+vapour

*liquid

#718

*!Nitrogen is a colourless, … and inodorous gas

Which word is missed in this sentence?

*muddy

*dreggy

*+transparent

*metallic

*semisolid

#719

*!Water plays a vital part in the …of animals and plants.

Which word is missed in this sentence?

*distribution

*+nutrition

*preparation

*combustion

*reduction

#720

*!An examiner and a student.

An examiner: “What can you say about nitrogen?”

A student: …………………………………….

Which answer is the most suitable to this dialogue?

*+It’s a colourless, transparent, tasteless and inodorous gas

*It’s a colourish, transparent, tasteless and odorous gas

*It’s a colourless, transparent, tasteless and inodorous liquid

*It’s a colourless, transparent, tasteless and inodorous water

*It’s a colourish, tasty and odorous gas

#721

*!An examiner and a student.

An examiner: “How is nitrogen prepared?”

A student: ………….

Which answer is the most suitable to this dialogue?

*It’s prepared by freezing

*It’s prepared by boiling

*It’s prepared by soaking

*It’s prepared by frosting

*+It’s prepared by burning

#722

*!An examiner and a student.

An examiner: “How is water purified?”

A student: ………….

Which answer is the most suitable to this dialogue?

*+Water is purified by boiling

*Water is purified by burning

*Water is purified by melting

*Water is purified by freezing

*Water is purified by solidifying

#723

*!An examiner and a student.

An examiner: “What are the elements of water?”

A student: ………….

Which answer is the most suitable to this dialogue?

*Methane and propane are the elements of water

*Oxygen and uranium are the elements of water

*+Hydrogen and oxygen are the elements of water

*Nitrogen and oxygen are the elements of water

*Nitrogen and hydrogen are the elements of water

#724

*!An examiner and a student.

An examiner: “What substance is water?”

A student: ………….

Which answer is the most suitable to this dialogue?

*Water is a comminuted substance

*+Water is a compound substance

*Water is a soluble substance

*Water is an adhesive substance

*Water is a simple substance

#725

*!An examiner and a student.

An examiner: “What kills water germs?”

A student: ………….

Which answer is the most suitable to this dialogue?

*Melting kills germs

*Burning kills germs

*+Boiling kills germs

*Heating kills germs

*Removing kills germs

#726

*!An examiner and a student.

An examiner: “At what temperature does water freeze?”

A student: ………….

Which answer is the most suitable to this dialogue?

*+Water freezes at 0ºC into crystalline ice

*Water have been frozen at 0ºC into crystalline ice

*Water melts at 0ºC into crystalline ice

*Water heats at 0ºC into crystalline ice

*Water has been frozen at 0ºC into crystalline ice

#727

*!An examiner and a student.

An examiner: “Why do we need distilled water at laboratories?”

A student: ………….

Which answer is the most suitable to this dialogue?

*+Distilled water is needed to work with chemical substances

*Distilled water is needed to clean the atmosphere

*Distilled water is needed to nourish animals

*Distilled water is needed to wash boilers

*Distilled water is needed to wash flasks

#728

*!An examiner and a student.

An examiner: “Why do we need phosphorus in obtaining nitrogen?”

A student: ………….

Which answer is the most suitable to this dialogue?

*We obtain nitrogen by refrigerating phosphorus

*+We obtain nitrogen by burning phosphorus

*We obtain hydrogen by burning phosphorus

*We obtain nitrogen by freezing phosphorus

*We obtain distilled water by boiling phosphorus

#729

*!An examiner and a student.

An examiner: “What water is used at laboratories?”

A student: ………….

Which answer is the most suitable to this dialogue?

*fresh water

*sweet-water

*ordinary water

*+distilled water

*liquid water