Chemistry Exam

Which metal is heaviest ?

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osmium
mercury
iron
nickle

What is the general formula of Alkanes?

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No. of hydrogen atoms is triple the no. of carbon atom plus tw
No. of hydrogen atoms is double the no. of carbon atom plus two
No. of hydrogen atoms is double the no. of carbon atom
No. of hydrogen atoms is double the no. of carbon atom plus four

The partial pressure of a component in a gas-phase reaction is 0.452 atm. What is the activity of the component?

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0.452 bar
0.458
0.458 bar
0.452 atm

2 methylbutane on reacting with bromine in the presence of sunlight gives mainly:

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1 – bromo -2 - methylbutane
2 – bromo -2 - methylbutane
2 – bromo -3 - methylbutane
1 – bromo -3 – methylbutane

For a galvanic cell, which of the following statements is never true?

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The potential of the cathode is higher than that of the anode
The electrons flow in the external circuit from the anode to the cathode
Reduction takes place at the cathode
Oxidation takes place at the anode

The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is:

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Carbon
Hydrogen
Oxygen
Nitrogen

Which of the following sets of quantum numbers is correct for an electron in 4f orbital?

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N= 4, I =3, m = +4, s = +1/2
N= 3, I = 2, m = -2, S = + 1/2
N=4, I = 3, m = +1, s = + 1/2
N=4, I = 4, m -4, s = - 1/2

What is the hardest form of carbon ?

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Coke
Graphite
Charcoal
Diamond

Alloys made with mercury as one metal are called ?

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Mixtures
Emulsions
Solders
Amalgams

The major constituent of air is:

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Nitrogen
Carbon dioxide
Oxygen
Hydrogen

What among following is used to produce artificial rain ?

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Copper oxide
Carbon monoxide
Silver iodide
Silver nitrate

In a sample of ethyl ethanoate (CH3COOC2H5) the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?

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One of the oxygen atoms has gained electrons
One of the oxygen atoms has gained two neutrons
The two oxygen atoms are isotopes
The two oxygen atoms are isobars

Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 ml of 1.5 M first solution + 520 mL of 1.2 M second solution. What is the molarity of the final mixture?

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1.20 M
1.50 M
1.344 M
2.70 M

The most commonly used bleaching agent is:

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Alcohol
Carbon dioxide
Chlorine
Sodium chlorine

Air contains maximum amount of

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Oxygen
Nitrogen
Hydrogen
Carbon dioxide

Ozone is :

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Non-magnetic
Paramagnetic
Ferromagnetic
Diamagnetic

Which of the following is/are not caused due to Nitric oxide pollution? (1) Leaf spotting in plants (2) Bronchitis-related respiratory problems in human (3) Production of corrosive gases through photochemical reaction (4) Silicosis in human

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1 and 3
Only 1
1, 2 and 4
Only 4

What is used to avoid melting of ice ?

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Gelatine
Butane
Methane
Any acid

What is used to avoid melting of ice ?

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Gelatine
Butane
Methane
Any acid

The items amenable to detection by soft x-rays are:

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Contrabands
Lead in bullets
Narcotics
Genuine coins from counterfeit coins

Which among the following is a Noble Gas?

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Nitrogen
Hydrogen
Oxygen
Helium

In the process of electroplating a utensil with zinc:

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The utensil is made the cathode
Pure zinc is made the anode
The utensil is made the cathode and pure zinc is made the anode
The utensil is made the anode and pure zinc is made the cathode

Which one is an organic Acid ?

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Sulphuric
Citric
Nitric
Phosphoric

Due to rusting the weight of iron:

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Decreases
Increases
Remains the same
Uncertain

The term PVC used in the plastic industry stands for:

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Polyvinyl chloride
Polyvinyl carbobate
Phosphor vanadiu chloride
Phosphavinyl chloride

Which one of the following is correct?

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Unsaturated oils tend to be solid at room temperature
Saturated oils tend to be liquid at room temperature
Saturated oils tend to be solid at room temperature
None of the above

Among the following acids which has the lowest pKa value?

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CH3COOH
HCOOH
(CH3)2COOH
CH3CH2COOH

In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of AgBr. The percentage of bromine in the compound is(at. mass Ag = 108; Br = 80):

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24
36
48
60

Helium is preferred to hydrogen in air balloons because it:

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Is cheaper
Is less dense
Has greater lifting power
Does not form an explosive mixture with air

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed? (i) It is an endothermic reaction (ii) It is an exothermic reaction (iii) The pH of the resulting solution will be more than seven (iv) The pH of the resulting solution will be less than seven

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(i) and (ii)
(ii) and (iii)
(i) and (iv)
(iii) and (iv)

Chemistry Exam : Question 1 of 30