Which of the following pairs of gases cannot be dried by downward delivery?

Nickel is used in the hydrogenation of alkenes because it

Aluminium is extracted by

Which of the following gases is used in fire extinguishers?

Both Na+ and K+ have

If a gas occupies a volume of 400 cm3 at a temperature of 400 K and a pressure of 1 atm, at what temperature and pressure would its volume be 200 cm3?

The nucleus of a hydrogen atom consists of

If acidified \(\text{K}_2{Cr}_2 {O}_7\) acts as an oxidizing agent, the colour changes from

Which of the following elements is a metalloid?

Iodine could be separated from a mixture of iodine and calcium chloride by

Sodium chloride is used in the following processes except

Which of the following bonds is not an intermolecular force?

All the following compounds are ionic except

The metal carbonate that would not decompose when heated strongly is

In the use of a universal indicator, red colour is an indication that the substance is a

Which of the following oxides would form two different types of acids when dissolved in water?

Ethanol could be prepared in the laboratory by

Alkali metals are good conductors of heat and electricity because they

In a chemical reaction, ΔH is positive when

how many pi-bond(s) are present in propene

Which of the following compounds would readily undergo addition reaction?

A covalent hydride which does not exist as a gas at room temperature is

In the electrolysis of dilute hydrochloric acid at the anode

In which of the following arrangement are the ions arranged in decreasing order of ionic size?

The filter in a cigarette reduces the amount of nicotine inhaled by

If \(\text{25cm}^3\) of a saturated solution contains 0.02 moles of the solute, determine the solubility of the solute

Biotechnology is applied in the following processes except

Which of the following conditions are necessary for the preparation of alkanols from alkanes and alkanoic acids?

All of the following compounds are covalent except

A salt that could be prepared by double decomposition is

The IUPAC name of the compound

\(\text{CH}_3CHClCH_2OH\) is

Neutral atom of neon with atomic number 10 is isoelectronic with

Which of the following species is the most powerful reducing agent?

The electronic configuration of element Y is

\(\text{1s}^2s^22p^63s^23p^4\) Y, therefore 

Which of the following alkanols is tertiary?

Which of the following elements is commercially obtained by electrolysis of its fused salt?

The lustre of a metal is due to its

Exothermic reactions take place when energy given out in making bonds is

Which of the following metals would not release hydrogen when reacted with dilute HCl?

Five d-orbitals having the same energy level in an isolated transition metal are described as

Which of the following oxides is amphoteric?

The allotrope of carbon used in the decolorization of sugar is

In the periodic table, valence electrons are indicated by

Nucleons are sub-atomic particles which consist of

A few drops of sodium hydroxide is added to an aqueous solution, a green precipitate is formed. The ion that may be present in the solution is

When \(\text{C}_2H_4\) molecule is polymerized, the polymer formed is

When a hypothesis is proven within the limit of available evidence, it becomes a

Empirical formula is the