Tag: chemistry

Questions Related to chemistry

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

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

  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

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Correct Option: C
Explanation:
Vinegar is homogenous solution because it is a completely uniform solution of liquid in liquid type of mixture (acetic acid in water)

The heterogeneous mixture of soot particles in air is a mixture of:

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

  1. solid-in-solid

  2. solid-in-gas

  3. gas-in-solid

  4. gas-in-gas

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Correct Option: B

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

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

  1. True

  2. False

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Correct Option: B
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.

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

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

  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)

Show answer
Correct Option: D
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.

Which pair is a miscible liquid mixture?

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

  1. Ethylalcohol and water

  2. Mercury and alcohol

  3. Benzene and water

  4. Carbondisulphide and water

Show answer
Correct Option: A
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. 

Hydrogen blow torch is based on :

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

  1. short bond length of $H _2$

  2. high bond energy of $H _2$

  3. high calorific value of $H _2$

  4. least molecular weight

Show answer
Correct Option: C
Explanation:

Hydrogen blow torch is based on high calorific value of  $H _2$.


Hence the correct option is C.

Which of the following statements are not true for hydrogen?

chemistry non-metals dihydrogen fuel dihydrogen as a fuel introduction to 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

Show answer
Correct Option: C,D
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.

Dalda (Vanaspathi) is prepared by:

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

  1. hydrogenation of triolien

  2. hydrogenation of soap

  3. hydrogenation of tristearine

  4. electrolysis of potassium acetate

Show answer
Correct Option: A
Explanation:

Dalda (Vanaspathi) is prepared by hydrogenation of triolien.

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

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

  1. Liquid

  2. Gas

  3. Compressed gas

  4. Pressurized gas

Show answer
Correct Option: B
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.

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

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

  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

Show answer
Correct Option: B
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.