Tag: know about some common gases

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Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

Cork stopper can be used as a plug in _____ in the chemistry laboratory.

  1. flask

  2. test tube

  3. condenser

  4. both A and B
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

Cork stopper is often used when a reaction is taking place in the flask or test tube and the by product or result of the reaction is desired to be collected. Its basic function is to plug. Also, it can be used in condenser. 

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

Which of the following are the correct precautions while bending a glass tube?

  1. Select the tube of sufficient length to keep your hands safe from heat.

  2. While heating, the glass tube should be rotated in order to ensure uniform heating.

  3. Never bend the glass tubing by force. Doing so can break the tubing.

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

We have to take following precautions while cutting a glass tube:

  • Make a single deep scratch at the desired length with one stroke of file.
  • To avoid injury, hold the glass tube with the help of a thick piece of cloth or wear protective gloves.
  • Heat the end using a Bunsen Burner. Do not heat the end for long time. It may seal the end or make it narrow.
  • Select the tube of sufficient length to keep your hands safe from heat.
  • While heating, the glass tube should be rotated in order to ensure uniform heating.
  • Never bend the glass tubing by force. Doing so can break the tubing.

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

Corks are ideal stoppers because of:

  1. its impermeability

  2. absence of toxic substances

  3. availability in a variety of standard sizes

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Corks are used as stoppers because they are impermeable to liquids and gases, do not contaminate samples with toxic substances, and are manufactured in standard sizes to fit common laboratory glassware.

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

 Which type of splicing reaction requires a guanine nucleoside or nucleotide cofactor that is not used as a source of energy?

  1. Group IV

  2. Group I

  3. Group II

  4. Spliceosomal
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Group I type of splicing reaction requires a guanine nucleoside or nucleotide cofactor that is not used as a source of energy. Self splicing group 1 intorns share number of different properties with enzymes which increases tthe reaction rate. The intorns excition the reactiion due to the internal guide sequence.

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

Which of the following are the correct precautions while cutting a glass tube?

  1. Make a single deep scratch at the desired length with one stroke of file.

  2. To avoid injury, hold the glass tube with the help of a thick piece of cloth

  3. Do not heat the end for long time. It may seal the end or make it narrow.

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

We have to take following precautions while cutting a glass tube:

  • Make a single deep scratch at the desired length with one stroke of file.
  • To avoid injury, hold the glass tube with the help of a thick piece of cloth or wear protective gloves.
  • Heat the end using a Bunsen Burner. Do not heat the end for long time. It may seal the end or make it narrow.

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

What are the uses of glass/rubber tubes in the laboratory?

  1. It helps cold water to flow in and out of the condenser to allow heated water vapourise

  2. For liquid and gases in the experiment, rubber stoppers are used as plugs in the flask

  3. Rubber tubing is always connected to a condenser, helps in distillation

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Glass tubing is a long, clear tube used as a passage for liquid or gas in experiments. 
Rubber stoppers are used as plugs in flasks or test tubes. 
Rubber tubing is often connected to a condenser, which is a laboratory tool used in the process of distillation. The rubber tubing helps cool water to flow in and out of the condenser and helps the heated water vapor in the condenser return to its liquid state. 

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

What is the uses of cork in the laboratory?

  1. It is used as a plug so that the volatile substances do not go out of the container

  2. It also serve as a stopper

  3. Very helpful in fractional distillation

  4. both A and B
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

Corks are useful for stopping of volatile substances to go out, stopper, helps in fractional distillations.