Some Basic Concepts of Chemistry · Chemistry · MHT CET

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MCQ (Single Correct Answer)

1

A gaseous mixture of $\mathrm{O}_2$ and $\mathrm{CH}_4$ are in the ratio $1: 4$ by mass. Find the ratio of their molecules.

MHT CET 2025 22nd April Evening Shift
2

Find the number of water molecules in 1 mL of water vapours at STP?

MHT CET 2025 22nd April Evening Shift
3

Calculate the number of $\mathrm{Cl}^{-}$ions in 222 g unhydrous calcium chloride?

(At. mass $\mathrm{Ca}=40, \mathrm{Cl}=35.5$ )

MHT CET 2025 22nd April Morning Shift
4

What is vapour density of $\mathrm{O}_2$ gas?

MHT CET 2025 22nd April Morning Shift
5

Calculate the number of $\mathrm{Ca}^{2+}$ ion in 222 g anhydrous calcium chloride? (At. Mass $\mathrm{Ca}=40, \mathrm{Cl}=35.5$ )

MHT CET 2025 21st April Evening Shift
6
Find the number of moles present in 0.448 L of dihydrogen at STP.
MHT CET 2025 21st April Morning Shift
7

Find out number of carbon atoms present in 0.35 mole of glucose.

MHT CET 2025 20th April Evening Shift
8

What is the mass in grams of 0.25 mol water?

MHT CET 2025 20th April Morning Shift
9

If salicylic acid ( 138 u ) reacts with acetic anhydride ( 102 u ) to from aspirin ( 180 u ) calculate \% atom economy.

MHT CET 2025 20th April Morning Shift
10

Find the mass of potassium chlorate required to liberate $5.6 \mathrm{dm}^3$ of oxygen gas at STP? (molar mass of $\mathrm{KClO}_3=122.5 \mathrm{~g} / \mathrm{mol}$ )

MHT CET 2025 19th April Evening Shift
11

What is the molar mass of compound represented by following structure formula?

MHT CET 2025 19th April Morning Shift Chemistry - Some Basic Concepts of Chemistry Question 6 English

MHT CET 2025 19th April Morning Shift
12
What is the volume occupied by 0.5 mol of $\mathrm{CO}_2$ at STP?
MHT CET 2025 19th April Morning Shift
13
In a chemical reaction, sum of formula weight of all reactants is 274 u and atom economy is $50 \%$, calculate formula weight of desired product?
MHT CET 2025 19th April Morning Shift
14

Calculate mass in kg of 2.5 mole ammonia.

MHT CET 2024 16th May Evening Shift
15

Find the number of moles of sodium atoms in $6.9 \times 10^{-2} \mathrm{~kg}\left(\right.$ Atomic mass $\left.=23 \mathrm{~g} \mathrm{~mol}^{-1}\right)$

MHT CET 2024 16th May Morning Shift
16

What is the percentage by mass of oxygen in NaOH ? (Atomic mass of $\mathrm{Na}=23 \mathrm{u}, \mathrm{O}=16 \mathrm{u}, \mathrm{H}=1 \mathrm{u}$ )

MHT CET 2024 15th May Morning Shift
17

What is value of percent atom economy when reactants having sum of formula weight 78 u results in the formation of a product with formula weight 65 u ?

MHT CET 2024 15th May Morning Shift
18

How many molecules of carbon dioxide are formed when 0.6 g carbon is burnt in air?

MHT CET 2024 11th May Evening Shift
19

Which of the following pair of compounds cannot demonstrate law of multiple proportion?

MHT CET 2024 11th May Morning Shift
20

What is the percentage atom economy when formula weight of product obtained is 70 u and the sum of formula weight of reactant is 140 u ?

MHT CET 2024 11th May Morning Shift
21

Which law is illustrated by compounds $\mathrm{H}_2 \mathrm{O}$ and $\mathrm{H}_2 \mathrm{O}_2$ formed from two different elements, H and O ?

MHT CET 2024 10th May Evening Shift
22

What is the volume of oxygen required for complete combustion of 0.25 mole of methane at S.T.P.?

MHT CET 2024 10th May Morning Shift
23

Chlorine exists in two isotopic forms ${ }^{35} \mathrm{Cl},{ }^{37} \mathrm{Cl}$. If average atomic mass of chlorine is 35.5 , what is the percentage abundance of these isotopes respectively?

MHT CET 2024 10th May Morning Shift
24

Chlorine has two isotopes ${ }^{35} \mathrm{Cl}$ and ${ }^{37} \mathrm{Cl}$ with average atomic mass of 35.5 . What is the ratio of their relative abundance respectively?

MHT CET 2024 9th May Evening Shift
25

Calculate mass in kg of $4.48 \mathrm{dm}^3$ carbon dioxide at STP.

MHT CET 2024 9th May Evening Shift
26

What is the volume occupied by 1 molecule of water, if its density is $1 \mathrm{~g} \mathrm{~cm}^{-3}$ ?

MHT CET 2024 9th May Morning Shift
27

What is the number of moles of Cl atoms and N atoms respectively present in n moles of tear gas?

MHT CET 2024 9th May Morning Shift
28

Calculate number of moles present in $9.10 \times 10^{-2} \mathrm{~kg}$ of water.

MHT CET 2024 4th May Evening Shift
29

"A given compound always contains the same proportion of elements" is a statement of -

MHT CET 2024 3rd May Evening Shift
30

Which of the following pair of compounds does not demonstrate the law of multiple proportion?

MHT CET 2024 3rd May Morning Shift
31

What is the molar mass of third member of homologous series if the molar mass of first member is 46 g ?

MHT CET 2024 2nd May Evening Shift
32

How many moles of carbon atoms are present in 3.6 kg of carbon?

MHT CET 2024 2nd May Evening Shift
33

What is the mass in kg of 5 mole of acetic acid $\left(\mathrm{mol}\right.$. mass $\left.=60 \mathrm{~g} \mathrm{~mol}^{-1}\right)$ ?

MHT CET 2024 2nd May Morning Shift
34

Which of the following pair of compounds demonstrates the law of multiple proportions?

MHT CET 2023 14th May Evening Shift
35

What is number of atoms present in $$2.24 \mathrm{~dm}^3 \mathrm{~NH}_{3(\mathrm{~g})}$$ at STP?

MHT CET 2023 14th May Morning Shift
36

Calculate the percent atom economy when a product of formula weight $$175 \mathrm{u}$$ is obtained in a chemical reaction using $$225 \mathrm{u}$$ formula weight reactant.

MHT CET 2023 14th May Morning Shift
37

According to reaction,

$$\mathrm{Mg}(s)+2 \mathrm{HCl}(a q) \longrightarrow \mathrm{MgCl}_2(a q)+\mathrm{H}_2(g) \uparrow .$$

Calculate the mass of $$\mathrm{Mg}$$ required to liberate $$4.48 \mathrm{~dm}^3 \mathrm{~H}_2$$ at STP?

(Molar mass of $$\mathrm{Mg}=24 \mathrm{~g} \mathrm{~mol}^{-1}$$)

MHT CET 2023 13th May Evening Shift
38

What is the value of percent atom economy when an organic compound of formula weight $$75 \mathrm{~u}$$ is obtained from reactants having sum formula weight $$225 \mathrm{~u}$$ ?

MHT CET 2023 11th May Evening Shift
39

Which from following substances consists of total 1 mole atoms in it? (Molar mass of $$\mathrm{NH}_3=17, \mathrm{H}_2 \mathrm{O}=18, \mathrm{~N}_2=28, \mathrm{CO}_2=44$$ )

MHT CET 2023 11th May Evening Shift
40

How many moles of nitrogen atoms are present in $$8 \mathrm{~g}$$ of ammonium nitrate?

(Molar mass of ammonium nitrate $$=80$$ )

MHT CET 2023 10th May Evening Shift
41

Calculate the $$\mathrm{pH}$$ of a buffer solution containing $$0.01 ~\mathrm{M}$$ salt and $$0.004 \mathrm{~M}$$ weak acid.

$$\left(\mathrm{pK}_{\mathrm{a}}=4.762\right)$$

MHT CET 2023 10th May Evening Shift
42

What volume of ammonia is formed when $$10 ~\mathrm{dm}^3$$ dinitrogen reacts with $$30 ~\mathrm{dm}^3$$ dihydrogen at same temperature and pressure?

MHT CET 2023 9th May Evening Shift
43

Identify number of moles of donor atoms in $$2 \mathrm{n}$$ mole of $$\mathrm{SCN}^{-}$$.

MHT CET 2023 9th May Morning Shift
44

Which of the following concentration terms depends on temperature?

MHT CET 2023 9th May Morning Shift
45

What is the mass in gram of 1 atom of an element if its atomic mass is $$10 ~\mathrm{u}$$ ?

MHT CET 2023 9th May Morning Shift
46

How many gram of H$$_2$$O are present in 0.25 mol of it?

MHT CET 2021 24th September Evening Shift
47

What is percentage atom economy during conversion of reactant to product if formula weight of reactants is 246 u and of product is 123 u?

MHT CET 2021 24th September Evening Shift
48

Identify the change in colour when $$\mathrm{NaCl}$$ solution is titrated against $$\mathrm{AgNO}_3$$ solution using fluorescein indicator.

MHT CET 2021 24th September Morning Shift
49

What is percent dissociation of acetic acid in it's $$0.01 \mathrm{~M}$$ solution if dissociation of acid is $$1.34 \times 10^{-2}$$ ?

MHT CET 2021 24th September Morning Shift
50

How many molecules are present in $$22400 \mathrm{~cm}^3$$ of a gas at STP?

MHT CET 2021 24th September Morning Shift
51

Calculate osmotic pressure exerted by a solution containing $$0.822 \mathrm{~g}$$ of solute in $$300 \mathrm{~mL}$$ of water at $$300 \mathrm{~K}$$.

(Molar mass of solute $$=340 \mathrm{~g} \mathrm{~mol}^{-1}, \mathrm{R}=0.0821 \mathrm{~L} \mathrm{~atm} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$$)

MHT CET 2021 24th September Morning Shift
52

The pH of monoacidic weak base is 10.9. Calculate the percent dissociation in 0.02 M solution.

MHT CET 2021 24th September Morning Shift
53

Lithium shows diagonal relationship with

MHT CET 2021 24th September Morning Shift
54

How many molecules of ammonia gas are present in 67.2 dm$$^3$$, measured at S.T.P.?

MHT CET 2021 23rd September Evening Shift
55

What is the SI unit of density?

MHT CET 2021 23rd September Evening Shift
56

How many moles of urea are present in 5.4 g ? (Molar mass = 60)

MHT CET 2021 22th September Evening Shift
57

What is the mass of potassium chloride produced when $$12.25 \mathrm{~g}$$ potassium chlorate undergo decomposition? (At mass: $$\mathrm{K}=39, \mathrm{Cl}=35.5, \mathrm{O}=16$$ )

MHT CET 2021 22th September Morning Shift
58

Which from following formulae is a correct formula to determine percent atom economy?

MHT CET 2021 22th September Morning Shift
59

What is the volume (in dm$$^3$$) occupied by 75 g ethane at S.T.P. ?

MHT CET 2021 21th September Morning Shift
60

"Mass can neither be created nor destroyed" is the statement of

MHT CET 2021 20th September Evening Shift
61

What amount of oxygen is used at S.T.P. to obtain 9 g water from sufficient amount of hydrogen gas?

MHT CET 2021 20th September Morning Shift
62

What is value of percent atom economy if formula weight of product is 46 u and sum of formula weight of all reactants is 92 u?

MHT CET 2021 20th September Morning Shift
63

$$60 \mathrm{~g} \mathrm{~CH}_3 \mathrm{COOH}$$ dissolved in $$1 \mathrm{~dm}^3$$ solvent, what is molality of solution?

(density = $$1.25 \mathrm{~g} / \mathrm{cm}^3$$)

MHT CET 2020 16th October Evening Shift
64

What is the molarity of solution containing $$3.2 \mathrm{~g}$$ of $$\mathrm{NaOH}$$ (molar mass $$40 \mathrm{~g} \mathrm{~mol}^{-1}$$) in $$250 \mathrm{~cm}^3$$ of water?

MHT CET 2020 16th October Morning Shift
65

The combining ratios of hydrogen and oxygen in water and hydrogen peroxide are $1: 8$ and $1: 16$. Which law is illustrated in this example?

MHT CET 2019 3rd May Morning Shift
66

What is the percentage of carbon in urea? (Atomic mass $C=12, H=1, N=14, O=16$)

MHT CET 2019 2nd May Morning Shift
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