#### 11th Standard Chemistry English Medium Free Online Test Book Back 1 Mark Questions with Answer Key

11th Standard

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Chemistry

Time : 00:10:00 Hrs
Total Marks : 10

10 x 1 = 10
1. An element X has the following isotopic Composition 200X = 90%, 199X = 8% and 202X = 2% The Weighted average atomic mass of the element X is closet to

(a)

201 u

(b)

202 u

(c)

199 u

(d)

200 u

2. The energies E1and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths ie $\lambda$1 and$\lambda$2 will be

(a)

$\frac { { \lambda }_{ 1 } }{ { \lambda }_{ 2 } } =1$

(b)

${ \lambda }_{ 1 }=2{ \lambda }_{ 2 }$

(c)

${ \lambda }_{ 1 }=\sqrt { 25\times 50{ \lambda }_{ 2 } }$

(d)

$2{ \lambda }_{ 1 }={ \lambda }_{ 2 }$

3. The electronic configuration of the elements A and Bare 1s2, 2s 2,2p6,3s2 and 1s2, 2s2,2p5 respectively. The formula of the ionic compound that can be formed between these elements is

(a)

AB

(b)

AB2

(c)

A2B

(d)

none of the above

4. Water gas is

(a)

H2O(g)

(b)

CO + H2O

(c)

CO + H2

(d)

CO + N2

5. Which of the following statements is in correct?

(a)

Li+ has minimum degree of hydration among alkali metal cations

(b)

The oxidation state of K in KO2 is +1

(c)

Sodium is used to make Na / Pb alloy

(d)

MgSO4 is readily soluble in water

6. Select the molecule which has only one $\pi$ bond.

(a)

CH3– CH = CH – CH3

(b)

CH3– CH = CH – CHO

(c)

CH3– CH = CH – COOH

(d)

All of these

7. For the following reactions
(A) CH3CH2CH2Br + KOH → CH2 = CH2 + KBr + H2O
(B) (CH3)3CBr + KOH → (CH3)3 COH + KBr
(C)
Which of the following statement is correct?

(a)

(A) is elimination, (B) and (C) are substitution

(b)

(A) is substitution, (B) and (C) are elimination

(c)

(A) and (B) are elimination and (C) is addition reaction

(d)

(A) is elimination, B is substitution and (C) is addition reaction

8. The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is

(a)

the eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain

(b)

the staggered conformation of ethane is more stable than eclipsed conformatio, because staggered conformation has no torsional strain

(c)

the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain

(d)

the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has no torsional strain

9. The IUPAC name of  is

(a)

2-Bromo pent – 3 – ene

(b)

4-Bromo pent – 2 – ene

(c)

2-Bromo pent – 4 – ene

(d)

4-Bromo pent – 1 – ene

10. The gaseous envelope around the earth is known as atmosphere. The region lying between an altitudes of 11-50 km is __________

(a)

Troposphere

(b)

Mesosphere

(c)

Thermosphere

(d)

stratosphere