Chemistry · Science General

Common Chemical Compounds and Reactions

1,197 Questions

Common chemical compounds and reactions questions test your knowledge of everyday chemicals, their formulas, and their interactions. Topics include properties of acids and bases, hard water chemistry, and compounds like baking soda and plaster of paris. This section is essential for general science preparation.

Acids and basesPlaster of parisHard water chemistryCommon chemical formulasEveryday chemical reactions

Common Chemical Compounds and Reactions Questions

Multiple choice urea organic compounds with functional group containing nitrogen

Monte catini process is used for the manufacture of:

  1. nitric acid

  2. calcium ammonium nitrate (CAN)

  3. phosphoric acid

  4. urea
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Fauser-Montecatini process was offered by montecatini, italy. Two methods of liquid recycle was offered an aqueous recycle scheme and liquid ammonia-recycling scheme. The advantage of recycling with ammonium carbamate in liquid is that raising the conversion of ammonium carbamate to urea does not return water to the synthesis autoclave there. In the aqueous recycle process the pressure employed was 180-200$Kg/{ cm }^{ 2 }g$ and the temperature was between 180-190, the effluent from the urea synthesis is led down to a medium pressure of about 21 $Kg/{ cm }^{ 2 }g$ in first stage and close to atmospheric in the second stage of decomposer. The off gases from the first decomposer consisted mainly of ammonia with some carbon dioxide, and this was absorbed in water and recycled back to the autoclave in an aqueous solution. The ammonia and carbon dioxide from the second decomposer were absorbed in water and this dilute solution used to absorb the gases entering the first absorber.

Multiple choice urea organic compounds with functional group containing nitrogen

Dehydration of ammonium carbamate produces:

  1. biuret

  2. ammonia water

  3. urea

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ability of ammonium carbamate to make urea was first discovered in 1870 by Bassarov when he heated ammonium carbamate in sealed glass tubes at temperatures ranging from 130 to 140 $℃$. This yields urea and water in an equimolar ratio. A typical industrial plant that makes urea can produce up to 1500 tons a day. Ammonia and carbon dioxide is excessively fed to a synthesis reactor in this process. Ammonium carbamate is produced as an intermediate in this reactor and can then be dehydrated to urea according to the following equation.

${ H } _{ 2 }N-COON{ H } _{ 4 }→N{ H } _{ 2 }CON{ H } _{ 2 }+{ H } _{ 2 }O$

Multiple choice biology micro - organism useful actions of algae introduction to algae algae

Druse is

  1. Calcium-oxalate crystals

  2. Bicarbonate crystals
  3. $CaCO _3$ crystals

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Druse is a rock cavity lined with a crust of projecting crystals.
  • They include crystals of calcium oxalate.
  • They provide defence against herbivory due to their toxicity. 
  • Algae, angiosperms and gymnosperms contain Calcium oxalate crystals.
  •  Hence, Druse is Calcium-oxalate crystals.
  • So, the correct answer is 'Calcium-oxalate crystals'.
Multiple choice geography rocks and rock cycle rock cycle and uses of rocks rocks - introduction and importance lithosphere and asthenosphere

Plaster of Paris is prepared by 

  1. Rocky salts

  2. Salts

  3. Sugar

  4. Gypsum
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plaster of paris originally was made from the extensive gypsum deposits of Montmartre in Paris.

Plaster of paris, consists of a fine white powder (calcium sulfate hemihydrate), which hardens when moistened and allowed to dry. Known since ancient times, plaster of paris is so called because of its preparation from the abundant gypsum found near Paris.

Multiple choice chemistry combustion extinguishing fire ways to control fire combustion, fuels and flame

Which of the following is a constituent of foam type fire extinguisher?

  1. Dilute sulphuric acid

  2. Sodium carbonate

  3. Dilute hydrochloric acid

  4. All of above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The foam type of fire extinguisher is also called as soda acid fire extinguisher. It consists of dilute sulphuric acid and sodium bicarbonate (soda). When it is released under high pressure in the form of foam, it covers the surface of fire and controls it by cutting off oxygen.

Multiple choice chemistry substances in common use common salt some useful compounds in everyday life salts and their properties study of some important salts salts used in daily life

Bleaching powder is made up of : 

  1. lime and chlorine

  2. soda ash and chlorine

  3. chlorine and charcoal

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Calcium hydroxide on reaction with chlorine produces bleaching powder. 


$Ca(OH) _2+Cl _2\to Ca(OCl)Cl+H _2O$                     

Multiple choice chemistry atoms, molecules and radicals molecular formula and valency valency and chemical formulae combining capacity and chemical formulae

The trivial name of $Na _{2}CO _{3}$ is:

  1. soda ash

  2. soda carb

  3. soda

  4. baking soda
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Trivial name of $Na _2CO _3\longrightarrow$ Soda Ash

Chemical name of $Na _2CO _3\longrightarrow$ Sodium Carbonate
A chemical formula is of great importance
$\longrightarrow$ Name of compounds are represented by the chemical formula.
Example: Sodium bicarbonate$\longrightarrow NaHCO _3$
Sulphuric acid $\longrightarrow H _2SO _4$
$\longrightarrow$ It is known by chemical formula how many atoms of a particular element are present in the compound.
Example: Phosphoric acid
$H _3PO _4$ shows that there are $3$ atoms of hydrogen, $1$ atom of Phosphorus and $4$ atoms of oxygen.
$\longrightarrow$ It represents what elements are present in the compound by its symbol.
Example:- $NaCl\longrightarrow$ Sodium chloride has sodium and chlorine in it.

Multiple choice chemistry substances in common use salts and their properties study of some important salts salts used in daily life

The product of electrolysis of conc. solution of common salt is?

  1. $Na+Cl _{2}$
  2. $H _{2}+O _{2}$
  3. $NaOH+H _{2}+Cl _{2}$
  4. $Na+Cl _{2}+O _{2}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ionization of salt:

$NaCl\rightarrow Na^{+}+Cl^{-}$

The half-reaction at the cathode is:

$H _2O+2e^{−}\rightarrow H _2+2OH^{−}$

Here, the reduction is taking place.

The half-reaction at the anode is:

$2Cl^{-}\rightarrow Cl _2+1e^{−}$

Here, oxidation is taking place.

The overall reaction is as follows:

$NaCl+H _2O\rightarrow Na^{+}+OH^{−}+H _2+Cl _2$.

Hence, option $C$ is correct.
Multiple choice chemistry substances in common use salts and their properties study of some important salts salts used in daily life

Which impurity (as a salt) is associated with table salt obtained from sea-water?

  1. $NaHCO _3$
  2. $MgCO _3$
  3. $MgCl _2$
  4. $NaI$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sea water contains $MgCl _2$ brine so salt made from sea water contains this as impurity.
sea salt:

 Chloride $(Cl^-)$  55.03%
 Sodium $(Na^+)$  30.59%
 Sulfate $(SO _4^{2-}$ 7.68% 
 Magnesium $(Mg^{2+})$ 3.68% 
 Calcium $(Ca^{2+})$ 1.18% 
 Potassium $(K^+)$ 1.11% 
 Bicarbonate $(HCO _3^-)$ 0.41% 
 Bromide $(Br^-)$ 0.19% 
Multiple choice chemistry substances in common use salts and their properties study of some important salts salts used in daily life

Commercial common salts become slightly damp on keeping. This is due to the fact that:

  1. common salt is hygroscopic

  2. common salt contains some impurities which are hygroscopic

  3. common salt is efflorescent

  4. common salt is crystalline
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Commercial common salt commonly becomes slightly damp on keeping because common salt contains some impurities like ${MgCl _2}$ and ${CaCl _2}$ which are hygroscopic in nature and absorb moisture from the atmosphere.
Hence, option B is correct.

Multiple choice chemistry substances in common use salts and their properties study of some important salts salts used in daily life

The commercial salt is purified by passing :

  1. $H _2S$ gas through an alkaline solution ofsalt

  2. HCI gas through a saturated solution of salt
  3. $H _2$ gas through a solution of salt
  4. $CI _2$ gas through a saturated solution of salt
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The common table salt is prepared by passing HCI gas through a saturated solution of salt. The precipitation is due to common ion effect.

$\underset { Salt\,solution }{ NaCl }+H^++Cl^-\longrightarrow  \underset { ppt}{ NaCl } $

Hence, option B is correct.