Tag: chemistry

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Multiple choice chemistry separation of substances substances and mixtures formation of mixtures and types of mixtures based on states types of mixtures

Vinegar is a solution of acetic acid in water, it is:

  1. a homogeneous solid in liquid mixture

  2. a heterogeneous liquid in liquid mixture

  3. a homogeneous liquid in liquid mixture

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Vinegar is homogenous solution because it is a completely uniform solution of liquid in liquid type of mixture (acetic acid in water)
Multiple choice chemistry separation of substances substances and mixtures formation of mixtures and types of mixtures based on states types of mixtures

Unlike gases, can all liquids in liquid mixtures form solutions.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

No, not all liquids in liquids mixture form solutions

we know that "like dissolve like", so, the liquids which have same polarity only form solutions.
for example: water and oil have different polarity and hence they do not form solution.

Multiple choice chemistry separation of substances substances and mixtures formation of mixtures and types of mixtures based on states types of mixtures

Match the column I with column II and select the correct option from the codes given :


Column I                       Column II

P. Chalk-water mixture     (i) A gaseous mixture
Q. Glucose solution          (ii) A solid-gas mixture
R. Fizzy drink                    (iii) A homogeneous solid-liquid mixture
S. Smoke                          (iv) A solid-liquid mixture
T. Air                                 (v) A gas-liquid mixture

  1. P-(iii), Q-(iv), R-(v), S-(i), T-(ii)

  2. P- (v), Q- (iii), R- (iv), S- (ii), T-(i)

  3. P-(ii), Q-(i), R-(iv), S- (v), T- (iii)

  4. P-( iv), Q- (iii), R- (v), S-(ii), T-(i)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Chalk-water mixture- A heterogeneous solid-liquid mixture

Glucose solution- A homogeneous solid-liquid mixture

Fizzy drink- A gas-liquid mixture

Smoke - A solid-gas mixture

Air - A gaseous mixture

Hence the correct option is D.
Multiple choice chemistry separation of substances substances and mixtures formation of mixtures and types of mixtures based on states types of mixtures

Which pair is a miscible liquid mixture?

  1. Ethylalcohol and water

  2. Mercury and alcohol

  3. Benzene and water

  4. Carbondisulphide and water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Water is polar and has hydrogen bonding. Since, ethyl alcohol has oxygen atom it also undergoes hydrogen bonding when mixed with water. Also, ethyl alcohol is polar due to high electro-negativity of $O$, due to which it mixes with water. Hence, ethyl alcohol and water are a pair of miscible liquid mixture. 
Multiple choice chemistry non-metals dihydrogen fuel dihydrogen as a fuel introduction to hydrogen

Which of the following statements are not true for hydrogen?

  1. It exists as diatomic molecule

  2. It has one electron in the outermost shell

  3. It can lose an electron to form a carbon which can freely exist

  4. It forms a large number of ionic compounds by losing an electron
Reveal answer Fill a bubble to check yourself
C,D Correct answer
Explanation

The electronic configuration of the Hydrogen atom is $1s^1$.

It has one electron in the outermost shell. It exists as a diatomic molecule $(H _2)$ by sharing its' electron with other hydrogen atom.

It cannot form ionic compounds because it cannot donate its' electron and can only form covalent compounds by sharing the electron. It cannot lose an electron to form a cation because the hydrogen atom cannot exist after losing an electron.

Multiple choice chemistry non-metals dihydrogen fuel dihydrogen as a fuel introduction to hydrogen

In which of the following way, the transportation of hydrogen gas do not take place?

  1. Liquid

  2. Gas

  3. Compressed gas

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

The transportation of hydrogen gas is done in heavy metal cylinders and it can also be transported in liquid form. In order to transport large amounts of hydrogen it must be either pressurized and delivered as a compressed gas, or liquefied.

Multiple choice chemistry non-metals dihydrogen fuel dihydrogen as a fuel introduction to hydrogen

$H _2$ is best alternative to fossil fuels but use of hydrogen as a fuel is dangerous because:

  1. it is chemically unstable.
  2. the storage of $H _2$ is very risky and can causes explosion.

  3. it is very expensive.

  4. it causes the corrosion of containers in which it is present
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$H _2$ is best alternative to fossil fuels but use of hydrogen as a fuel is dangerous because the storage of $H _2$ is very risky and causes explosion because of low ignition energy.