X is a crystalline salt of sodium solution of X in water turns litmus red and produces a gas which turns lime water milky when added to sodium carbonate. With barium chloride solution, X gives hydrochloric acid. X is

A. Na ₂CO ₃

B. NaHCO ₃

C. NaHSO ₄

D. Na ₂SO ₄

The alkanol obtained from the production of soap is

A. ethanol

B. glycerol

C. methanol

D. propanol

E. glycol

The flame used by welders in cutting metals is

A. butane gas flame

B. acetylene flame

C. kerosene flame

D. oxy-acetylene flame

E. oxygen flame

Consecutive members of an alkane homologous serires differ by

A. CH

B. CH₂

C. CH₃

D. C_nH_n

E. C_nH

If an element has the electronic configuration 1s ² 2s² 2p³ 3s² 3p⁴, it is

A. a metal

B. an alkaline earth metal

C. an s-block element

D. a p-Block element

E. a transition element

Some copper (ll) sulphate pentahydrate (CuSO₄ 5H₂O), was heated at 120 ^oC with the following results. Wt of crucible = 10.00 g; Wt of crucible + CuSO₄ 5H₂O =14.98g; Wt of crucible + residue = 13.54 g. How many molecules of water of crystalization were lost?

[H = 1, Cu = 63.5, O = 16, S = 32]

A. 1

B. 2

C. 3

D. 4

E. 5

The three-dimensional shape of methane is

A. hexagonal

B. trigonal

C. linear

D. tetrahedral

E. cubical

An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a swe

A. a soap

B. an oil

C. an alkane

D. an ester

E. sucrose

An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a swe

A. C₁₂H₂₂O₁₁

B. C₆H₁₂O₆

C. C₃H₆O ₃

D. C₇H₁₄O₇

E. C₁₂H₆O₄

An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a swe

A. plastic industry

B. textile industry

C. brewing industry

D. soap industry

E. dyeing industry