When 6.3 g of sodium bicarbonate is added to 30 g of the acetic acid solution, the residual solution is found to weigh 33 g. The number of moles of carbon dioxide released in the reaction is _____.

(a)

3

(b)

0.75

(c)

0.075

(d)

0.3

Which of the following is/are true with respect to carbon -12 ?

(a)

relative atomic mass is 12 u

(b)

the oxidation number of carbon is +4 in all its compounds.

(c)

1 mole of carbon-12 contain 6.022 x 10²² carbon atoms.

(d)

All of these

If a beaker holds 576g of water, what will be the gram molecules of water in that beaker?

(a)

23 gram molecule

(b)

23%

(c)

32%

(d)

32 gram molecule

In redox reaction which of the following Is true?

(a)

Number of electrons lost is more than number of electrons gained

(b)

Number of electrons lost is less than number of electrons gained

(c)

Number of electrons lost is equal number of electrons gained

(d)

No transfer and gain of electrons during the reaction.

Consider the following statements
1. \(\lambda\) = h / mv is valid only when the particle travels at speed much less than the speed of light.
2. Einstein's mass-energy relationship is E = mc²
3. The angular momentum (mvr) ofthe electron must be equal to an integral multiple of h/4\(\pi\) . Which of the following statements) given above is/ are correct?

(a)

1&3 

(b)

Only 1

(c)

1 & 2

(d)

1, 2 & 3

What would be the formula of the compound formed by A and B, where A has the valence 3 and B has the valence 3?

(a)

AB

(b)

AB₃

(c)

A₃B

(d)

3AB₃

The first ionisation potential ofNa is 5.1 eY. The value of electron gain enthalpy is _____________

(a)

+2.55 eV

(b)

-2.55 eV

(c)

-5.1 eV

(d)

-10.2 eV

The half life period of Tritium is ___________

(a)

12.33 secs

(b)

12.33 mins

(c)

12.33 hrs

(d)

12.33 years

Which one of the following is used to study the movements of ground water?

(a)

Deuterium

(b)

Protium

(c)

Tritium

(d)

HD

Which of the following does not have any effect with water?

(a)

Sodium

(b)

Iron

(c)

Lead

(d)

Mercury

The hydration enthalpies of alkali metal ions decreases in ______ order.

(a)

Li⁺ > Na⁺ > K⁺ > Rb⁺ > Cs⁺

(b)

Cs⁺ > Rb⁺ > K⁺ > Na⁺ > Li⁺

(c)

Li⁺ > Rb⁺ > K⁺ > Na⁺ > Cs⁺

(d)

Rb⁺ > Cs⁺ > K⁺ > Na⁺ > Li⁺

Which of the following halides has the highest melting point?

(a)

NaF

(b)

NaCI

(c)

NaBr

(d)

NaI

Compounds of alkaline earth metals are less soluble in water than the corresponding alkali metals salts due to ________

(a)

their increased covalent character

(b)

high lattice energy

(c)

their high ionization energy

(d)

none of the above

Consider the following statements.
(i) Superoxides of alkali metals are diamagnetic.
(ii) Superoxides of alkali metals are blue in colour.
(iii) Superoxides of alkali metals are paramagnetic.
Which of the above statements is/are not correct?

(a)

(i) only

(b)

(ii) only

(c)

(iii) only

(d)

(i) and (ii)

In fire works, red colour flash is produced by ________

(a)

Ba

(b)

Ra

(c)

Sr

(d)

Rb

Which of the following is not a peroxide?

(a)

KO₂

(b)

CrO₅

(c)

Na₂O₂

(d)

BaO₂

Which of the following is used in making armour plates?

(a)

Lithium + magnesium

(b)

Lithium + aluminium

(c)

Lithium + lead

(d)

Sodium + lithium

The measure of attractive forces of molecules is called _________

(a)

internal pressure

(b)

cohesion pressure

(c)

both (a) and (b)

(d)

neither (a) nor (b)

Among the following groups which contains monoatomic gases?

(a)

Group 17

(b)

Group 18

(c)

Group 1

(d)

Group 15

The temperature below which a gas obey Joule Thomson effect is called __________.

(a)

critical temperature

(b)

standard temperature

(c)

inversion temperature

(d)

normal temperature

A fundamental goal of thermodynamics is the prediction of __________ of the process.

(a)

reversibility

(b)

rate

(c)

spontaneity

(d)

none of these

The formation of ammonia from N₂(g) and H₂(g) is a reversible reaction
N₂(g) + 3H₂(g) ⇌ 2NH₃(g) + Heat
What is the effect of increase of temperature on this equilibrium reaction ______________

(a)

equilibrium is unaltered

(b)

formation of ammonia is favoured

(c)

equilibrium is shifted to the left

(d)

reaction rate does not change

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

Which one of the following is a homogeneous mixture?

(a)

Sea water

(b)

Air

(c)

Alloys

(d)

All the above

Ethylidene chloride on treatment with aqueous KOH gives ___________

(a)

acetaldehyde

(b)

ehtyleneglycol

(c)

formaldehyde

(d)

glycoxal