1. Some basic concept of chemistry - Rajasthan Board (RBSE) STD 11 Science Chemistry Questions

660

Questions

1

Question groups

5

Question types

01

M.C.Q (1 Marks)

660 Q→

Sample Questions

1. Some basic concept of chemistry questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark

The highest number of helium atoms is in

A
$4$ u of helium
B
$4 \mathrm{~g}$ of helium
C
$2.271098 \mathrm{~L}$ of helium at $STP$
✓
$4 \mathrm{~mol}$ of helium

Answer: D.

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Q 2M.C.Q (1 Marks)1 Mark

A compound $X$ contains $32 \%$ of $A, 20 \%$ of $B$ and remaining percentage of $C$. Then, the empirical formula of $X$ is :

(Given atomic masses of $A=64 ; B=40 ; C=32 u$ )

✓
$\mathrm{ABC}_3$
B
$\mathrm{AB}_2 \mathrm{C}_2$
C
$\mathrm{ABC}_4$
D
$\mathrm{A}_2 \mathrm{BC}_2$

Answer: A.

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Q 3M.C.Q (1 Marks)1 Mark

$1$ gram of sodium hydroxide was treated with $25 \mathrm{~mL}$ of $0.75 \mathrm{M} \mathrm{HCl}$ solution, the mass of sodium hydroxide left unreacted is equal to

✓
$250 \mathrm{mg}$
B
0 $\mathrm{mg}$
C
$200 \mathrm{mg}$
D
$750 \mathrm{mg}$

Answer: A.

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Q 4M.C.Q (1 Marks)1 Mark

The right option for the mass of $CO _2$ produced by heating $20 g$ of $20 \%$ pure limestone is $........\,g$(Atomic mass of $Ca =40$ )$\left[ CaCO _3 \stackrel{1200 K }{\longrightarrow} CaO + CO _2\right]$