#### 11th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Four

11th Standard

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Chemistry

Time : 00:25:00 Hrs
Total Marks : 25

25 x 1 = 25
1. Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidising behaviour?

(a)

Cu + 2H2 SO4 $\longrightarrow$ CuSO4 +SO2 + 2H2O

(b)

C + 2H2 + SO4 $\longrightarrow$ CO2 + 2SO2 + 2H2O

(c)

BaCl2 + H2SO4 $\longrightarrow$ BaSO4 + 2HCl

(d)

None of the above

2. Which of the following pairs of d-orbitals will have electron density along the axes ?

(a)

dz2, dxz

(b)

dxz, dyZ

(c)

dz2, dx2-y2

(d)

dxy ,dx2-y2

3. Which of the following expressions represents the electron probability function?

(a)

$4\pi r dr{ \Psi }^{ 2 }$

(b)

$4\pi r^2 dr{ \Psi }$

(c)

$4\pi r^2 dr{ \Psi }^{ 2 }$

(d)

$4\pi r dr{ \Psi }$

4. Which of the following elements will have the highest electro negativity

(a)

Chlorine

(b)

Nitrogen

(c)

Cesium

(d)

Fluorine

5. The most electronegative element of the periodic table is _______

(a)

Iodine

(b)

Flourine

(c)

Chlorine

(d)

Oxygen

6. Electronegativity of the following elements increases in the order

(a)

C, N, Si, P

(b)

N, Si, C, P

(c)

Si, P, C, N

(d)

P,Si, N, C

7. If a body of a fish contains 1.2 g hydrogen in its total body mass, if all the hydrogen is replaced with deuterium then the increase in body weight of the fish will be

(a)

1.2 g

(b)

2.4 g

(c)

3.6 g

(d)

$\sqrt{4.8}$g

8. ___________ is considered as the potential alternative fuel of the future.

(a)

hydrogen

(b)

gasoline

(c)

biodiesel

(d)

propane

9. Which set of the metals do not have any effect on water?

(a)

Ag, Au, Pt

(b)

Na, Mg, Al

(c)

Fe, Ca, Zn

(d)

Fe, Pb, Na

10. In which process, fused sodium hydroxide is electrolysed for extraction of sodium ?

(a)

Castner's process

(b)

Cyanide process

(c)

Down process

(d)

All of these

11. Find out the correct statement with respect to alkali metals.

(a)

They react with oxygen to give mainly the oxide MO2

(b)

They react with halogen to give halides MX

(c)

Their nitrates decompose on heating to give NO2 and O2

(d)

Their carbonates decompose on heating to give CO2 and MO

12. Consider the following statements.
(i) Alkali metals exhibit high chemical reactivity due to their low ionization energy.
(ii) Lithium is a very soft metal and even it can be cut with a knife.
(iii) Francium is a radioactive element in group 1 elements
Which of the above statements is/are not correct?

(a)

(i) only

(b)

(ii) only

(c)

(i) and (iii)

(d)

(i), (ii) and (iii)

13. The rice is cooked earlier in pressure cooker because

(a)

boiling point increases with increasing pressure

(b)

boiling point decreases with increasing pressure

(c)

Internal energy is not lost while cooking in pressure cooker

(d)

Extra pressure of pressure cooker softens the rice

14. An ideal gas, obeying kinetic theory of gases cannot be liquefied, because

(a)

its critical temperature is above 0°C.

(b)

force acting between its molecules are negligible.

(c)

its molecules are relatively small in size.

(d)

it solidifies before becoming a liquid

15. Maximum deviations from ideal gas is expected from:

(a)

H2(g)

(b)

N2(g)

(c)

CH4(g)

(d)

NH3(g)

16. The instrument used for measuring the atmospheric pressure is ___________.

(a)

lactometer

(b)

barometer

(c)

electrometer

(d)

ammeter

17. If system moves from ordered state to disordered state, its entropy:

(a)

Decreases

(b)

Increases

(c)

Become zero

(d)

Increases then decreases

18. For the reaction N2O4(g) ⇌ 2NO(g) Kc = 0.21 at 373 K. The concentrations of N2O4 and NO2 are found to be 0.125 mol dm-3 and 0.5 mol dm-3 respectively at a given temperature. Predict the direction of the reaction.

(a)

At equilibrium

(b)

reverse direction

(c)

forward direction

(d)

Both reverse and forward direction

19. The blocking of capillaires due to sudden release of bubbles of N2 gas in blood is known as

(a)

bends

(b)

blends

(c)

mends

(d)

all of these

20. Among the following mixtures, dipole-dipole as the major inferaction, is present in

(a)

Benzene and CCl4

(b)

Benzene and C2H5OH

(c)

CH3COCH3 and CH3CN

(d)

KCI and water

21. Vapour phase diagram for a solution is below if dotted line represents deviation?

Correct observation for this solution

(a)

$\triangle$Hmix  : +ve

(b)

$\triangle$Smix : +ve

(c)

$\triangle$Vmix : +ve

(d)

All of these

22. Which one of the following test is used to detect phosphorous in an organic compound?

(a)

Silver nitrate test

(b)

Copper oxide test

(c)

Ammonium molybdate test

(d)

Lassaigne's test

23. The electromeric effect is

(a)

Permanent effect

(b)

Temporary effect

(c)

p-electrons transfer in the effect

(d)

Both (b) and (c)

24. Which of the following is an example for polyhalo compounds?

(a)

Vinyl iodide

(b)

Chlorobenzene

(c)

Allyl chloride

(d)

Chloroform

25. BOD values less than 5 ppm indicates a water sample to be

(a)

Poor in dissolved oxygen

(b)

rich in dissolved oxygen

(c)

Highly polluted

(d)

Not suitable for aquatic life