R4RIN – MCQs, Mock Tests | Chemistry Chemistry MCQ Questions Set-10

Which is a compound that contains carbon?

1. Ethane
2. Propane
3. Methane
4. All of the above

✅ Correct Answer: 4

The mass number of an isotope of an element is 298. If its nucleus has 189 neutrons, what is its atomic number?

1. 298
2. 189
3. 109
4. 487

✅ Correct Answer: 3

which of the following molecule contains a nonpolar covalent bond?

1. Br2
2. CO2
3. CCl4
4. CO

✅ Correct Answer: 1

Which one of the following cell organelles mainly functions as storehouse of digestive enzymes?

1. Desmosome
2. Ribosome
3. Lysosome
4. Vacuoles

✅ Correct Answer: 3

Barbituric Acid was synthesized in 1864 by

1. Adolf von Baeyer
2. Marie Curie
3. Mendeleev
4. John Dalton

✅ Correct Answer: 1

Which of the following statements is not true?

1. Bacteria present in the mouth produce acids by degradation of sugar and food particles remaining in the mouth.
2. When pH of the mouth is higher than 5.5. then tooth decay starts.
3. Tooth enamel made of calcium phosphate is the hardest substance in the body.
4. Using toothpaste, which are generally basic, helps neutralise the excess acid and prevent tooth decay.

✅ Correct Answer: 2

Which of the following is not a type of chemical weathering?

1. Corrosion
2. Solution
3. Oxidation
4. Carbonation

✅ Correct Answer: 1

What two elements are used to make bronze?

1. Lead and copper
2. copper and tin
3. Tin and lead
4. copper and iron

✅ Correct Answer: 3

The principal quantum number indicates what property of an electron?

1. energy of electron
2. distance of electron from nucleus
3. both a & b
4. number of subshells

✅ Correct Answer: 3

The first two steps in the lithification process are

1. Cementation and Proposal
2. Compaction and Ratification
3. Compaction and Cementation
4. Ratification and Cementation

✅ Correct Answer: 3

Monazite is an ore of

1. Platinum
2. Radium
3. Uranium
4. Lanthanum

✅ Correct Answer: 4

Group 7A of the periodic table contains the

1. most reactive metals
2. least reactive non metals
3. most reactive non metals
4. least reactive metals

✅ Correct Answer: 3

The chemical makeup of a rock is

1. Nutrients
2. Minerals
3. Metals
4. Water

✅ Correct Answer: 2

Plaster of Paris ______. I. changes into gypsum on mixing with water II. is CaSO4.2H2O III. is used for decoration

1. Only I and II
2. Only I and III
3. Only II and III
4. All I, II and III

✅ Correct Answer: 2

Which best describes the nucleus of an atom?

1. It is the densest part of the atom
2. It has neutrons
3. It has protons
4. All of the above

✅ Correct Answer: 4

Theory of Evolution tells us how life evolved from simple to more complex forms

1. Darwins
2. Wallace
3. Mendel's
4. Lamarck's

✅ Correct Answer: 1

How many carbon and hydrogen atoms are there in Propane, respectively?

1. 2, 4
2. 2, 6
3. 4, 7
4. 3, 8

✅ Correct Answer: 4

Which of the following has the highest melting and boiling point?

1. Lithium
2. Phosphorous
3. Carbon
4. Argon

✅ Correct Answer: 3

Which process is a chemical change?

1. Burning gasoline
2. Boiling water
3. Evaporating water
4. Melting ice

✅ Correct Answer: 1

Atoms of the same element can differ in

1. Atomic number
2. Atomic mass
3. electrons
4. None of the above

✅ Correct Answer: 2

Synthetic detergents are prepared from

1. potassium salts of higher fattyacids
2. sodium salts of higher fattyacids
3. hydrocarbons of petroleum
4. glycerides

✅ Correct Answer: 3

Non metal found in liquid state?

1. Chlorine
2. Bromine
3. Fluorine
4. Iodine

✅ Correct Answer: 2

Which one of the following is commonly used as an indicator to measure the exact pH?

1. Eosin
2. Phenolphthalein
3. Universal indicator
4. Litmus

✅ Correct Answer: 3

Which among the following is false about acids?

1. They give H+ ions in aqueous solution
2. Most acids contain hydrogen
3. They turn blue litmus red
4. They are bad conductor of electricity in aqueous solution

✅ Correct Answer: 4

The mass of one molecule of oxygen is

1. 2.3 x 10-23 g
2. 3.3 x 10-23 g
3. 4.3 x 10-23 g
4. 5.3 x 10-23 g

✅ Correct Answer: 3

Alkali metals can

1. be highly unstable at room temperature
2. vaporize at room temperature
3. easily gain electrons
4. easily lose electrons

✅ Correct Answer: 4

Which of the following has the highest boiling point?

1. 2,3-dimethylbutane
2. 2-methylpentane
3. 2,2-dimethylbutane
4. 1,2-methylpentane

✅ Correct Answer: 3

Which one of the following is the correct relation between the Kelvin temperature (T) and the Celsius temperature (fc)?

1. These are two independent temperature scales
2. T = tc
3. T = tc - 273.15
4. T = tc + 273.15

✅ Correct Answer: 4

Atoms of same element having different mass numbers are called__________

1. Isobars
2. Isotopes
3. Isotones
4. Isomers

✅ Correct Answer: 2

The complexity and variety of organic molecules is due to

1. their interaction with water
2. their tremendously large sizes
3. the chemical versatility of carbon atoms
4. the variety of rare elements in organic molecules

✅ Correct Answer: 3

A change in which one or more new substances are formed is called _________.

1. Physical Change
2. Chemical Change
3. Rusting
4. Galvanisation

✅ Correct Answer: 2

Covalent bonds are formed when electrons are

1. Transfer of electrons
2. Sharing of electrons
3. Dividing of electrons
4. All of the above

✅ Correct Answer: 2

The movement of water molecules through the plasma membrane is called ______.

1. Osmosis
2. Sedimentation
3. Precipitation
4. Transpiration

✅ Correct Answer: 1

Which of the following has largest atomic radius?

1. Li
2. Be
3. B
4. O

✅ Correct Answer: 1

Which chemical is present in the cells of cork of tree which makes them impervious to gases and water

1. Cellulose
2. Suberin
3. Pectin
4. Lignin

✅ Correct Answer: 2

reaction occurs when sodium sulphate reacts with barium chloride

1. Single combination
2. Single displacement
3. Double displacement
4. Double combination

✅ Correct Answer: 3

In the modern periodic table. periods ............ and ........ contain Lanthanoides and Actinoides.

1. 3 and 4
2. 6 and 7
3. 4 and 5
4. 5 and 6

✅ Correct Answer: 2

Which of the following molecules is joined by a double covalent bond?

1. Cl2
2. O2
3. N2
4. He2

✅ Correct Answer: 2

Turquoise is an ore/mineral of

1. Copper
2. Manganese
3. Mercury
4. Tin

✅ Correct Answer: 1

What happens to electrons in an ionic bond?

1. collision of electrons
2. Sharing of electrons
3. Both A & B
4. Transfer of electrons

✅ Correct Answer: 4

Carbon dioxide is one of the gases that cause the _________.

1. greenhouse effect
2. ozonification
3. oven phenomenon
4. sunburn

✅ Correct Answer: 1

Which element is not a part of a nitrogenous base?

1. Carbon
2. Oxygen
3. Phosphorous
4. Nitrogen

✅ Correct Answer: 3

Adding which substance gives blue colour to glass?

1. Manganese oxide
2. Cobalt oxide
3. Chromium oxide
4. Iron oxide

✅ Correct Answer: 2

All atoms of the same element have the same

1. number of protons
2. number of electrons
3. atomic number
4. All of the above

✅ Correct Answer: 4

When Granite rocks get metamorphosed, they form

1. Quartzite
2. Gneiss
3. Marble
4. Slate

✅ Correct Answer: 2

Which of the following gases is not generated in a biogas plant?

1. H2S
2. CO2
3. CH4
4. CO

✅ Correct Answer: 4

Which metal is responsible for Itai-Itai disease?

1. Cadmium
2. Nickel
3. Chromium
4. Mercury

✅ Correct Answer: 1

Which of the following is an ore of Aluminium?

1. Galena
2. Cryollite
3. Cinnabar
4. Epsom Salt

✅ Correct Answer: 2

One turn of the citric acid cycle produces

1. two molecules of carbon dioxide are released
2. three molecules of NADH and one molecule of FADH2 are generated
3. one molecule of ATP or GTP is produced
4. All of the above

✅ Correct Answer: 4

In general the largest component of bog soils is

1. organic matter
2. water
3. living organisms
4. air

✅ Correct Answer: 1