Free Printable Chemistry 1st Half Book Test

1.

1 / 12th of the mass of one carbon atom is called

a)

Mass number

b)

Atomic weight

c)

Relative atomic mass

d)

Atomic mass unit

2.

How many atoms of carbon are present in 90 g of glucose

a)

6.02 × 10²³

b)

1.80 × 10²³

c)

3.01× 10²³

d)

1.80 × 10²⁴

3.

The volume occupied by 3.2g of O₂ at STP

a)

2.24 dm³

b)

22.4 dm³

c)

1.12 dm³

d)

2.24 cm³

4.

NH₃ burns in O₂ according to the following reaction $4NH_3+3O_2\rightarrow2N_2+6H_2O$ Which one is correct?

a)

1 mole of NH₃ will produce 6 moles of N₂

b)

For the complete reaction, 2 moles of NH₃, 40g of O₂ are required

c)

For the complete reaction, 2 moles of NH₃, 20g of O₂ are required

d)

It shows that 1 mole of NH₃ will produce 1/2 mole of N₂

5.

Which of the following has least mass

a)

1 mole of nitrogen gas

b)

1 mole Neon gas

c)

1 mole sulphur

d)

3 × 10²³ atoms of C

6.

An ideal gas has a volume of V at 2 atm pressure keeping temperature of the gas constant, its pressure is doubled. The volume of gas will become

a)

V

b)

0.5 V

c)

2V

d)

4V

7.

All of the given types of enthalpy changes are either endothermic or exothermic. Select the one which can be endothermic as well as exothermic

a)

Enthalpy of combustion

b)

Enthalpy of ionization

c)

Enthalpy of formation

d)

Enthalpy of atomization

8.

To cook the food at a high mountain is difficult as compared to at sea level the reason is that

a)

The temperature at the top of the mountain is low

b)

The density of water decreases at the mountains

c)

The hydrogen bonding in water changes with the change of height

d)

The boiling point of water decreases at the mountain

9.

NaCl is face centered cubic structure in which Na⁺ ion at each face of unit cell is shared by

a)

4–unit cell

b)

2– unit cell

c)

Only one unit cell

d)

8–unit cell

10.

The vapour pressure of a liquid remains constant

a)

By increasing temperature

b)

By decreasing external pressure

c)

By increasing amount of liquid

d)

By decreasing force of attraction

11.

Proton is identical with

a)

Ionized hydrogen molecule

b)

Alpha particles

c)

Hydronium ion

d)

Ionized hydrogen atom

12.

A species has 18 electrons and 20 neutrons. It has charge of +2. Its mass number is

a)

39

b)

32

c)

38

d)

40

13.

An element X has the configuration 1s², 2s², 2p⁵. In its chemical reaction it is mostlikely to

a)

Gain three electrons

b)

Gain one electron

c)

Lose one electron

d)

Lose three electrons

14.

By increasing salt concentration, pH of which buffer will decrease

a)

Acidic

b)

Both acidic and basic

c)

Basic

d)

Difficult to predict

15.

The ionic bond, covalent bond and coordinate covalent bond all are present in

a)

NH⁺

b)

H₂O

c)

CuSO₄. 5H₂O

d)

HCl

16.

The geometry of molecule will be pyramidal if the outer most shell of the central atom has

a)

2 bond pair 2 lone pair

b)

3 lone pair, 1 bond pair

c)

1 bond pair, 3 lone pair

d)

3 – bond pair, one lone pair

17.

The correct increasing order of ionization energy

a)

Li < Be < B

b)

Li < C < B

c)

Li < B < Be

d)

Mg < Ca < Ba

18.

A state function which describes together the internal energy and product of pressure and volume is called.

a)

Internal energy

b)

Work

c)

Enthalpy

d)

Temperature

19.

Enthalpy change for the process NH₄Cl_(s) $\rightarrow$ NH₄Cl_(g) corresponds to enthalpy of

a)

Vapourization

b)

Sublimation

c)

Fusion

d)

Combustion

20.

Bond energy of N–H, H–H, and N º N bonds are Q₁, Q₂ and Q₃, $\Delta$ H of N₂ +3H₂ $\rightarrow$ 2 NH₃ is

a)

Q₃ + 3Q₃ – 2Q₁

b)

2Q₁ – Q₃ – 2Q₂

c)

Q₃ + 3Q₂ – 6Q₁

d)

Q₁ + Q₂ – Q₃

21.

A compound contains 50% sulphur and 50% oxygen by mass. The empirical formula of the compound is

a)

S₂O₃

b)

SO₂

c)

SO₃

d)

SO

22.

Which of the following represents a non-polar molecule with polar bonds

a)

NCl₃

b)

CCl₄

c)

NF₃

d)

N₂

23.

We have 4.6 g of C₂H₅OH and 3g of C₂H₆ then

a)

Number of molecules of both compounds are unequal

b)

Number of Hydrogen atoms are equal

c)

The mass of carbon in both compounds are different

d)

0.2 moles of oxygen are present in C₂H₅OH

24.

The amount of heat evolved when one mole HNO₃ and one mole NH₄OH react

a)

= 57.4 KJ

b)

> 57.4 KJ

c)

< 57.4 KJ

d)

$\ge$ 57.4 KJ

25.

When CuSO₄ is electrolyzed in aqueous solution using copper electrodes, then the substance which deposits at the cathode is

a)

Copper metal

b)

Hydrogen

c)

Oxygen

d)

Sulphate

26.

The units of equilibrium constant K_c for the reaction N₂ + 3H $\rightarrow$ 2NH₃ will be

a)

mol⁺² dm^–3

b)

mol dm^–3

c)

dm⁺⁶mol^–2

d)

No unit

27.

When iron is added to CuSO₄ solution

a)

Fe²⁺ ios reduced

b)

Cu²⁺ is reduced

c)

Hydrolysis of CuSO₄ occurs

d)

No reaction takes place

28.

The pOH of solution is 4 the [H⁺] ion concentration of the solution is

a)

4 moles dm^–3

b)

10^–10 mole dm^–1

c)

0.4 moles dm^–3

d)

4 × 10⁴ moles dm^–3

29.

The pKa value of CH₃COOH is 4.74 When we mix CH₃COOH and CH₃COONa in the ratio of 10 : 1, then the pH of the buffer is

a)

4.74

b)

5.74

c)

3.74

d)

7

30.

The units of second order rate constant is expressed as

a)

mole dm^–3 Sec^–1

b)

Sec^–1

c)

mole^–2 dm⁺⁶ Sec^–1

d)

mole^–1 dm⁺³ Sec^–1

31.

The rate of non gaseous reaction depends upon all except

a)

Catalyst

b)

Temperature

c)

Pressure

d)

Concentration

32.

Which one would liberate Br₂ from KBr

a)

HI

b)

SO₂

c)

I₂

d)

Cl₂

33.

The molecules of a gas show more deviation from ideal behaviour at low temperature, mainly because

a)

Kinetic energy is increased

b)

Attractive force dominate at low temperature

c)

Collisions become less frequent

d)

Densities of the gases increase

34.

The e/m value for the positive rays is minimum for

a)

Hydrogen

b)

Helium

c)

Oxygen

d)

Nitrogen

35.

Diamond and graphite are two allotropic forms of carbon, their heats of combustions are –395.41 kJ mol^–1 respectively. Heat change in the conversion of graphite to diamond is

a)

–1.9kj mol^–1

b)

+1.9kj mol^–1

c)

+788.9kj mol^–1

d)

–788.9kj mol^–1

36.

In the reaction 2A+B $\rightarrow$ A₂B, if concentration of A is doubled and that of B is halved, then rate of reaction will

a)

Decrease by 2 times

b)

Increases by 2 times

c)

Increases by 4 times

d)

Remains the same

37.

Consider the following statements

(i) No. of sigma bonds between two atoms is always one

(ii) $NH_4^+,H_3O^+\ and\ CH_4$ are isostructural w.r.t shape

(iii) Propene has eight sigma and one pi bond

(iv) H–O–H bond angle in ice is 109.5º Point out correct statement(s)

a)

i,ii only

b)

i,iii,iv

c)

i,ii,iii

d)

ii,iii,iv

38.

Kc expression $K_c=\frac{4x^2}{v\left(a-c\right)}$ is applicable for the reaction

a)

$PCl_5\rightarrow PCl_3+Cl_2$

b)

$2SO_2+O_2\rightarrow\ 2SO_3$

c)

$N_2O_4\rightarrow2NO$

d)

$N_2+3H_2\rightarrow\ 2NH_3$

39.

$K_{sp}$ value of a sparingly soluble salt AB₂ is 32 x 10^-9 . What will be maximum concentration of A²⁺ ions in solution

a)

16x10^-9

b)

16x10^-3

c)

8x10^-3

d)

8x10^-9

40.

Which of the following does not represent redox reactions?

a)

$Cr_2O_7^{2-}+2OH\rightarrow CrO_4^{2-}+H_2O$

b)

$10Cl^-+6H+2MnO_4^-\rightarrow5Cl_2+2Mn^{2+}+8H_2O$

c)

$2Ca(OH)_2+2Cl_2\rightarrow Ca\left(ClO\right)_2+CaCl_2+8H_2O$

d)

$PCl_5\rightarrow PCl_3+Cl_2$

Chemistry 1st Half Book Test

Total questions: 40

Worksheet time: 40mins

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