Question

Aqueous solution of salt (x) is alkaline to
litmus. On strong heating (x) it swells and
gives a glassy bead. When concentrated
sulphuric acid is added to a hot concentrated
solution of (x) white crystals of weak acid is
obtained. Then (x) is
(A) NaBO2
(B) B203
(C) Na2B407.10H2O
(D) H3B03​

Answer 1

Answer:

संकेत बिंदुओं के आधार पर निम्नलिखित लिखित विषय पर अनुच्छेद लिखिए। समय का सदुपयोग। (संकेत बिंदु: * समय का महत्व * समय सारिणी * समय निरंतर गतिमान)

Answer 2

Answer:Borax exists in nature as a hydrated salt Formula Na₂B₄O₇.10H₂O

Na₂B₄O₇ + 7H₂O ------> 2NaOH + 4H₂BO₃

Strong Base weak Acid

X=Na₂B₄O₇.10H₂O

2Na₂B₄O₇.10H₂O --------> 4NaBO₂ + 4B₂O₃ + 10H₂O

Y=NaBO₂

Na₂B₄O₇ +H₂SO₄ +5H₂O -----> Na₂SO₄ + 4H₃BO₃

H₃BO₃-------> HBO₂ +H₂O

Z=HBO₂ 

Hope it helped u.