NDA Chemistry 2017/2018 Past Questions

Which of these groups of metals react with cold water?

To 2.0cm³ of solution of X, NaOH solution was added drop by drop until in excess, a reddish-brown ppt insoluble in excess NaOH. The cation contained in sample X is:

Two radioactive elements Q and S have a half-life period of 10 hours and 20 hours respectively. Therefore,

Excess acidity caused by acid rain can be neutralized by adding

A chemical substance that speed up rate of chemical reaction is called

The rate of reaction does not depend upon

All are ionic compounds except

The chemical formula of silver bromide is

Aluminium (Al) is preferred in overhead power cables because

Reactivity series of metals is also known as the

To make coloured glasses, small quantities of oxides of metals form coloured silicate are often added to the reaction mixture of Na₂CO₃ and SiO₂. Such a metal is

Which of the following compounds gives a yellow residue when heated and also reacts with aqueous sodium hydroxide to give a white gelatinous precipitate soluble in excess sodium hydroxide solution?

The electronic configurations of two elements with similar chemical properties are represented by

Which of the following metals burns with a brick-red flame?

The noble gases owe their inactivity to

Which of the following substance is not a compound.

In an electrolytic cell, electrons enter the system through the

Permanent hardness of water is due to the presence of calcium sulphate which is not softened by boiling. Which of the following chemical is normally used to soften it?

How many moles of alanine C₃H₇NO₂, are there in 159g of alanine?

How many atoms are in one mole of CH₃OH?

How many grams of Ca(OH)₂ are in 1500cm³ of 0.0250M Ca(OH)₂

What volume of 0.50M KOH would be required to neutralize completely 500cm³ of 0.25M HCl solution?

What colour change is observed when ethane is passed into an acidified K₂Cr₂O₇ solution?

What element characterizes amino acids?

Which of the following reagent cannot be used to test for the presence of primary alkanol?

Which is a saturated hydrocarbon?

When sucrose solution is warmed with dilute hydrochloric acid, the resulting solution will:

Using the IUPAC system of naming the compound below is known as
$\table , , CH_3, , , , CH_3; , , ∣, , , , ∣; H_3C , -, C, -, CH_2, -, CH; , , ∣, , , , ∣; , , CH_3, , , , CH_3;$

Which of the following organic chlorides will not give a Friedel-Craft alkylation product when heated with benzene and AlCl₃

What is the total number of sigma bonds in the following compound? CH₃ — CH − C = CH — C − CH₂

Pi-bond in the following compound can be found between
H — C₁ = C₂H₂ — C₃H — NH₂

Which of the following is an important reactive electrophile in aromatic ring nitration?

The separation of petroleum fractions depends on the differences in their

What is the IUPAC name for the following compound?

What is the name of the following compound?
$\table , , H, -, C, -, H, , , ; , , , , ∣∣, , , ,; H_3C , -, CH_2, -, C, -, CH_2, -, CH_2, - CH_3;$

The electronic configuration of Mg²⁺ is

How many moles of KBrO₃ are required to prepare 0.0700 moles of Br₂ according to the reaction below
KBrO₃ + 5KBr + 6HNO₃ ⟶ 6KNO₃ + 3Br₂ +3H₂O

The formula weight of the compound, CaSO₄ is:

How many moles of alanine, C₃H₇NO₂, are there in 159g of alanine?

Which of the following does not have a noble gas electron configuration?