1
MHT CET 2023 14th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

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

A
$$\mathrm{CH}_4, \mathrm{CCl}_4$$
B
$$\mathrm{BF}_3, \mathrm{NH}_3$$
C
$$\mathrm{CO}, \mathrm{CO}_2$$
D
$$\mathrm{NO}_2, \mathrm{CO}_2$$
2
MHT CET 2023 14th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

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

A
$$6.022 \times 10^{22}$$
B
$$2.4088 \times 10^{23}$$
C
$$1.8066 \times 10^{22}$$
D
$$6.022 \times 10^{23}$$
3
MHT CET 2023 14th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

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.

A
$$70.1 \%$$
B
$$77.7 \%$$
C
$$90.5 \%$$
D
$$95.0 \%$$
4
MHT CET 2023 13th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

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 $$\mathrm{Mg}=24 \mathrm{~g} \mathrm{~mol}^{-1}$$)

A
12 g
B
4.8 g
C
6 g
D
2.4 g
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