Tag: know about some common gases

Questions Related to know about some common gases

Which piece of laboratory equipment is used to make precise measurement of only one volume?

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

  1. Beaker

  2. Graduated cylinder

  3. Volumetric flask

  4. Test tube

  5. Eudiometer

Show answer
Correct Option: C
Explanation:

Volumetric flasks are used to measure volume of liquids .  The liquid has accurate volume when the solution reaches to the corresponding marking on the scale. Volume is usually indicated in mL. During measurement of the volume the vessel must be placed on an even, horizontal support. The required volume is measured when the lower edge of meniscus of the liquid just touches the marking on the vessel.

Of the equipment listed below, which one would be more suitable to read a meniscus?

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

  1. $100\ mL$ beaker

  2. $500\ mL$ flask

  3. Watch glass

  4. $50\ mL$ buret

  5. Trough

Show answer
Correct Option: D
Explanation:

Buret is a graduated glass tuble with a top at one end, for delivering volumes of liquid. Since, it is graduated, it is most suitable for reading a meniscus.

A meniscus is basically a liquid seen at the top of a liquid. It can be concave or convex. depending on the surface tension of the liquid and adhesson to the wall of the container..  

Which of the following has a shallow bottom to increase the surface area of a liquid?

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

  1. Test tube

  2. Burette

  3. Crucible

  4. Evaporating dish

  5. Graduated cylinder

Show answer
Correct Option: D
Explanation:

Evaporating dish has a shallow bottom to increase the surface area of a liquid.
Evaporating dish is used to evaporate volatile solvent from a solution.

Which of the following you will not do in the laboratory while performing an experiment?


i. Pour acids and bases over a sink
ii. Wear goggles
iii. Heat a stoppered test tube

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

  1. i only

  2. ii only

  3. iii only

  4. i and iii only

  5. i, ii, and iii

Show answer
Correct Option: C
Explanation:
i.)  Pour acids and bases over a sink- It can be done to avoid cleaning of spill solution and equipment.

ii.) Wear goggles-we should always wear goggles.

iii.) Heating a stoppered test tube can cause the boiling to be extremely sudden, forcing the liquid out of the tube or vapours do not have space for coming out of test tube so it can damage test tube.  

Hence, the correct option is C.

Which of the following would you use to keep a dehydrated substance from rehydrating?

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

  1. Mortar and Pestle

  2. Beaker

  3. Evaporating dish

  4. Crucible

  5. Desiccator

Show answer
Correct Option: E
Explanation:

Desiccator is used to keep a dehydrated substance from rehydrating.
In desiccator, anhydrous calcium chloride or other suitable dehydrating agent is kept that will remove moisture from atmosphere. Thus, it provides dry atmosphere.

In which of the following pieces of glassware does a meniscus become of importance?

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

  1. Watchglass

  2. Burette

  3. Beaker

  4. Flask

  5. Funnel

Show answer
Correct Option: B
Explanation:

In Burette does a meniscus become of importance.
With the help of meniscus in Burette, we can measure accurate volume of liquid used for the titration

Which piece of laboratory is used to make precise measurements for the volume of a gas collected over water?

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

  1. Beaker

  2. Graduated cylinder

  3. Volumetric flask

  4. Test tube

  5. Eudiometer

Show answer
Correct Option: B
Explanation:

Graduated cylinder is measuring cylinder used to measure the volume of liquid or gas. It has a narrow cylinderial shap. Each marks as line/graduations in cylinder represents the amount of the liquid or gas that has been measured. Thus, it can be used to make precise measurements for the volume of gas collected over wales.

Which of the following is considered to be a dangerous procedure in the laboratory setting?

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

  1. Pouring all liquids especially acids and bases. over the sink

  2. Wearing goggles

  3. Pushing glass tubing. thermometers. or glass thistle tubes through a rubber cork

  4. Pointing the mouth of a test tube that is being heated away from you and others

  5. Knowing where the fire extinguisher and eyewash stations are located

Show answer
Correct Option: C
Explanation:

The following is considered to be a dangerous procedure in the laboratory setting
Pushing glass tubing. thermometers. or glass thistle tubes through a rubber cork
During the process, the glass may break and injure our hands.

What color is the flame of a Bunsen burner which is producing the maximum heat output it is capable of?

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

  1. Violet

  2. Yellow

  3. Blue

  4. Orange

  5. Red

Show answer
Correct Option: A
Explanation:

The hottest part of the flame is the tip of the inner flame which is violet in colour, while the coolest is the whole inner flame.

For which of the following solution we use glass rod to mix them in the chemistry laboratory.

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

  1. $H _2O$ and $CCl _4$

  2. $H _2O$ and $C _2H _5OH$

  3. $NaCl$ and $H _2O$

  4. All of these

Show answer
Correct Option: D
Explanation:

All the given pair of  compounds are miscible and are soluble in each other. Hence, we can use a glass rod to mix them in the chemistry laboratory.